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Check the CAN communication with control unit N80 (Steering column module). Interior CAN bus

Part 1

One or more messages from control unit N80 (Steering column module) are not available on the CAN bus.


Possible cause:


  • Check the CAN communication with control unit N80 (Steering column module).
  • Interior CAN bus

    Affected functions:


  • CAN Communication
  • Automatic transmission Function

-------------------------------------------------

Test 1: Engine compartment CAN test

Test 2: Check the CAN communication with control unit N80 (Steering column module). Test 3: Interior CAN check

  1. Engine compartment CAN test


    Test 1.1: Procedure in case of CAN faults Test 1.2: Evaluation of CAN fault codes Test 1.3: Further CAN test options

    1. Procedure in case of CAN faults


      Test 1.1.1: How do I quickly reach my goal? Test 1.1.2: General test information
      Test 1.1.3: General CAN fundamentals


      Test 1.1.4: Possible aids and their usage

      1. How do I quickly reach my goal?

        How do I quickly reach my goal?First call up menu item 'Evaluation of CAN fault codes' in case of CAN timeout fault codes and communication errors.The resulting tests must be performed.Menu item 'Further CAN test options' should only be called up if the above-specified tests do not produce the desired result.Note:Menu item 'General test information' can be called up for an explanation of the different CAN fault types.

      2. General test information

        Notes on CAN fault codes:CAN timeout fault

        • A CAN timeout fault code is set due to the absence of a CAN input signal.The cause of this may be not only the transmitter control unit, but also the CAN networking.
        • For example:No CAN message was received from control unit A. Bus OFF fault

        • A Bus OFF fault code is set, when the control unit cannot send a certain amount of messages to the CAN bus or the messages are incomplete.The control unit then switches off for a short time from CAN bus.
        • For example:CAN controller: CAN bus OFF Functional CAN fault

        • A functional CAN fault code is set because of an implausible CAN input signal.The cause of this is not the CAN networking, but the transmitter control unit or its sensors.
        • For example:CAN signal 'A' from control unit B is implausible.
          Notes on CAN faults that cannot be read out as fault codes.Bus wake-up event

        • An event that wakes up the bus without reason is designated a bus wake-up event.
        • The cause of this is not the CAN networking, but the transmitter control unit or its sensors.
        • Further possible causes of fault:
        • Magnetic fields caused by nearby high-voltage installations, railroad installations or power plants.
        • Magnetic fields can radiate on to lines and control units in rare cases and cause undefined behavior in the control units.
        • The special tool 'Star Diagnosis CANtool' can be used to log bus wake-up events, bus keepawake events and other signals.
          Bus keepawake event

        • When a control unit keeps communication on the bus awake without reason, this is designated a bus keepawake event.
        • The cause of this is not the CAN networking, but the transmitter control unit or its sensors.
        • Further possible causes of fault:
        • Magnetic fields caused by nearby high-voltage installations, railroad installations or power plants.
        • Magnetic fields can radiate on to lines and control units in rare cases and cause undefined behavior in the control units.
        • The special tool 'Star Diagnosis CANtool' can be used to log bus wake-up events, bus keepawake events and other signals.

              1. No further information available.


              2. General CAN fundamentals


                Test 1.1.3.1: Low-Speed CAN (83,3 kBit/s)

                Test 1.1.3.2: High-Speed CAN (125 kBit/s , 500 kBit/s)

                1. Low-Speed CAN (83,3 kBit/s) General CAN fundamentals


                  Low-Speed CAN (83,3 kBit/s)

                  • 83,3 kBit/s : For example:Interior CAN busSeries 211

                  • This CAN bus enables single-wire mode.
                  • 'Single-wire mode' means that fault-free communication between the control units is still possible even if one of the two CAN lines fails.
                  • This CAN bus does not require external terminating resistors.
          Legend and description for figure 1CAN-H: CAN bus HighCAN-L: CAN bus LowECU 1 ... n: Control unit 1 ... nLegend and description for figure 2U 1: Specification approx. 3,6 voltsU 2: Specification approx. 0 voltsU 3: Specification approx. 2,5 voltsU 4: Specification approx. 1,4 voltsU 5: Specification approx. 5 voltsContinue with button F2

          image

          image


                1. No further information available.


                2. High-Speed CAN (125 kBit/s , 500 kBit/s) General CAN fundamentals


                  High-Speed CAN (125 kBit/s , 500 kBit/s)

                  • 125 kBit/s : Interior CAN busSeries 221
                  • 125 kBit/s : Telematic CAN busSeries 221
                  • 500 kBit/s : For example:Drive train CAN bus
                  • 500 kBit/s : For example:Diagnostic CAN-Bus

                  • This CAN bus does not permit single-wire mode.
                  • This means that both CAN lines are always required for fault-free communication between the control units.
                  • This CAN bus requires external terminating resistors.
                  • The terminating resistors can be located in control units or voltage distributors depending on the CAN bus.
          Legend and description for figure 1CAN-H: CAN bus HighCAN-L: CAN bus LowECU 1 ... n: Control unit 1 ... nCAN terminating resistor ( Example: 120ohms)Legend and description for figure 2U 1: Specification approx. 3,6 voltsU 2: Specification approx. 2,5 voltsU 3: Specification approx. 1,4 voltsContinue with button F2

          image

          image


          1.1.3.2. No further information available.


              1. Possible aids and their usage

                Evaluation of CAN fault codes

                • The control units present in the vehicle (actual configuration) are compared with the coding in control unit CGW (specified configuration).
                • Filtering and evaluation of all CAN timeout fault codes present in the vehicleThe result of the evaluation leads to the required test steps.
                  Multimeter

                • Aids for voltage and resistance measurement in menu item 'Measurements with multimeter on CAN network' Measuring system

                • Aid for graphic representation of CAN signal and voltage levels
                • The specified characteristics shown in Measurement Technology are used to recognize changed CAN voltage levels, which can be caused by faulty CAN components.
                • Possible procedure: Disconnect and then reconnect the CAN bus subscribers at the voltage distributor one at a time.Compare the pass image with the actual image from the oscilloscope.
                  Star Diagnosis CANtool

                • Aids for representation of actual values and identification of bus wake-up events and bus keepawake events Continue with button F2

          1.1.4. No further information available.


            1. Evaluation of CAN fault codes Warning!Communication with ECU required.


            2. Further CAN test options


              Test 1.3.1: Information to engine compartment CAN network Test 1.3.2: Measurements with multimeter on CAN network Test 1.3.3: Test with the aid of the measuring system

              1. Information to engine compartment CAN network


                Test 1.3.1.1: Arrangement diagram

                Test 1.3.1.2: Wiring diagram of CAN bus

                1. Arrangement diagram

                  Location diagram (with special equipment)


                  Figure legend

                  • A1 (Instrument cluster)
                  • N3/10 (ME-SFI [ME] control unit)
                  • N73 (EIS [EZS] control unit)
                  • N47-5 (ESP and BAS control module)
                  • N15/3 (ETC [EGS] control unit)
                  • N15/5 (Electronic selector lever module control unit)
                  • N71 (Headlamp range adjustment control module)
                  • N93 (Central gateway control unit)
                  • N15/6 (Sprintshift control module)
                  • N80 (Steering column module)
                  • X11/4 (Diagnosis test connector)
                  • X63/4 (CAN databus adapter connector, 2-pin)
                  • Installation point of plug connection X63/4 (CAN databus adapter connector, 2-pin)
                  • Communication with ECU required

                    image

                2. Wiring diagram of CAN bus

                  Note

                  • WIS is not available on this system.
                  • It is not possible to display the requested WIS document [ PE0019P2200TA ].
                  • You can start WIS on another system and display the WIS document by entering the document number [ PE0019P2200TA ] in the 'Contents' field.

          1.3.1.2. No further information available.


              1. Measurements with multimeter on CAN network


                Test 1.3.2.1: Voltage supply of engine compartment CAN control modules Test 1.3.2.2: Resistance test of engine compartment CAN


                1. Voltage supply of engine compartment CAN control modules


                  Test 1.3.2.1.1: Check power supply at control unit ME-SFI. Test 1.3.2.1.2: Check power supply at control unit ESP. Test 1.3.2.1.3: Check power supply at control unit ETC. Test 1.3.2.1.4: Check power supply at control unit ESM. Test 1.3.2.1.5: Check power supply at control unit EZS.
                  Test 1.3.2.1.6: Check power supply at control unit A1 (Instrument cluster).

                  Test 1.3.2.1.7: Check power supply at control unit N80 (Steering column module).

                  Test 1.3.2.1.8: Check power supply at control unit N71 (Headlamp range adjustment control module). Test 1.3.2.1.9: Check power supply at control unit N93 (Central gateway control unit).
                  Test 1.3.2.1.10: Check power supply at control unit Y3/8n4 (Fully integrated transmission control (VGS) control unit).

                  1. Check power supply at control unit ME-SFI.


                    Test 1.3.2.1.1.1: Test voltage supply of circuit 30.

                    Test 1.3.2.1.1.2: Test current consumption of component N10/1kR (Circuit 87 relay, engine). Test 1.3.2.1.1.3: Test voltage supply of circuit 15.

                    1. Test voltage supply of circuit 30.

                      Connect socket box to component N3/10 (ME-SFI [ME] control unit).


                      Figure legend

                      • A -ConnectionTest cable 35-pin socket box
                      • 001 -Sockets of component N3/10 (ME-SFI [ME] control unit)
                      • 05 -35-pin socket box
                      • 050 -126-pin socket box
                        - 108 -Test cable 266 589 01 63 00
                      • N3/10 (ME-SFI [ME] control unit)
                      • II 1-63ConnectionTest cable
                      • III 64-126ConnectionTest cable Warning!

                        -
                      • Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).
                        Continue to test with button F2

                        image


                        Test voltage supply of circuit 30.


                        Test sequence

                      • Measure direct voltage with multimeter between sockets [ F.2 ] 98 and [ F.16 ] 112 of the 35-pole socket box tester.
                      • Switch on ignition.
                        Specified value

                        - Voltage[11.0...15.0] V
                        Question

                      • Is the measurement value OK?

                        YES

                        The measurement value is OK.End of test

                        NO

                        The measurement value is not OK.Possible cause and remedy

                        - N10/1f57 (Fuse 57)
                      • Lines End of test

                        image

                    2. Test current consumption of component N10/1kR (Circuit 87 relay, engine). Connect socket box to component N3/10 (ME-SFI [ME] control unit).


                      Figure legend

                      • A -ConnectionTest cable 35-pin socket box
                      • 001 -Sockets of component N3/10 (ME-SFI [ME] control unit)
                      • 05 -35-pin socket box
                      • 050 -126-pin socket box
                        - 108 -Test cable 266 589 01 63 00
                      • N3/10 (ME-SFI [ME] control unit)
                      • II 1-63ConnectionTest cable
                      • III 64-126ConnectionTest cable Warning!

                        -
                      • Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).
                        Continue to test with button F2

                        image

                        Test current consumption of component N10/1kR (Circuit 87 relay, engine).


                        Test sequence

                      • Measure direct current with multimeter between sockets [F.4] 100 and [F.27] 123 of the 126-pole socket box tester.
                      • Switch on ignition.
                        Specified value

                        - Amperage[0.1...0.3] A Question

                      • Is the measurement value OK?

                        YES

                        The test was okay.End of test

                        NO

                        The measurement value is not OK.Possible cause and remedy

                      • Lines to component N10/1kR (Circuit 87 relay, engine)
                      • N10/1kR (Circuit 87 relay, engine) End of test

                    3. Test voltage supply of circuit 15.

                      Connect socket box to component N3/10 (ME-SFI [ME] control unit).



                      Figure legend

                      • A -ConnectionTest cable 35-pin socket box
                      • 001 -Sockets of component N3/10 (ME-SFI [ME] control unit)
                      • 05 -35-pin socket box
                      • 050 -126-pin socket box
                        - 108 -Test cable 266 589 01 63 00
                      • N3/10 (ME-SFI [ME] control unit)
                      • II 1-63ConnectionTest cable
                      • III 64-126ConnectionTest cable Warning!

                        -
                      • Connection A of test cable 108 may NOT be connected to connection B of the 126-pin socket box (050).
                        Continue to test with button F2

                        image

                        Test voltage supply of circuit 15.


                        Test sequence

                      • Measure direct voltage with multimeter between sockets [ F.2 ] 98 and [ F.15 ] 111 of the 35-pole socket box tester.
                      • Switch on ignition.
                        Specified value

                        - Voltage[11.0...15.0] V
                        Question

                      • Is the measurement value OK?

                        YES

                        The measurement value is OK.End of test

                        NO

                        The measurement value is not OK.Possible cause and remedy

                      • N10/1kP (Circuit 15 relay)
                      • Lines End of test

          Page 86


          image

                  1. Check power supply at control unit ESP.


                    Test 1.3.2.1.2.1: Test voltage of terminal 87 at control unit N47-5 (ESP, SPS [PML] and BAS control unit). Test 1.3.2.1.2.2: Test of cable for voltage supply
                    Test 1.3.2.1.2.3: Test procedure ground cable

                    1. Test voltage of terminal 87 at control unit N47-5 (ESP, SPS [PML] and BAS control unit). 1.3.2.1.2.1. No further information available.


                    2. Test of cable for voltage supply

                      Test prerequisite

                      • Battery voltage is OK.
                        Test sequence

                      • Switch off ignition.
                      • Connect socket box.
                      • Switch on ignition.

                      • Measure direct voltage with multimeter between ground and socket (1.14) 14 of the 126-pole socket box tester.
                        Specified value

                        - Voltage[11.0...14.5] V
                        Question

                      • Is the measurement value OK?

                        YES

                        The measurement value is OK.Note

                      • Select further tests.

                        NO

                        The measurement value is not OK.Possible cause and remedy

                      • Lines
                        - F1f34 (Fuse 34)
                        End of test

                    3. Test procedure ground cable

                      Test prerequisite

                      • Battery voltage is OK.
                        Test sequence

                      • Switch off ignition.
                      • Connect socket box.

                      • W16/Measure resistance with multimeter between 3 and (2.23) 57 of the 35-pole socket box tester.

                        Page 87


                      • W16/Measure resistance with multimeter between 3 and (2.47) 81 of the 35-pole socket box tester.
                        Specified value

                      • Resistor< 1ohms Question

                      • Are the measurement values OK?

                        YES

                        The measurement values are OK.Note

                      • In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
                        End of test

                        NO

                        At least one of the measured values is not o.k.Possible cause and remedy

                      • Ground cable
                      • W16/3 (Ground (left of component compartment, power ground)) End of test

                  1. Check power supply at control unit ETC.

                    Operation number of operation texts and work units or standard texts and flat rates:27-0641Test sequence

                    • Switch off ignition.
                    • Connect socket box.
                    • Switch on ignition.
                    • Measure direct voltage with multimeter between sockets [2.30] 30 and [2.29] 29 of the 126-pole socket box tester.
                      Specified value

                      - Voltage[11.0...14.0] V
                      Question

                    • Is the measurement value OK?

                      YES

                      The measurement value is OK.Possible cause and remedy

                    • Replace component N15/3 (ETC [EGS] control unit).
                      End of test

                      NO

                      The measurement value is not OK.Possible cause and remedy

                    • Inspect connector 2 at control unit N15/3 (ETC [EGS] control unit) for damage, correct connection, loose contact and corrosion and repair, if necessary.
                      End of test

                  2. Check power supply at control unit ESM.

                    Operation number of operation texts and work units or standard texts and flat rates:27-0641Test sequence

                    • Switch off ignition.
                    • Disconnect connector at component N15/5 (Electronic selector lever module control unit).
                    • Switch on ignition.
                    • [A.2] Measure direct voltage with multimeter between 2 and 1 [A.1] Status of relevant actual value:
                    • Supply voltage (tml. 15):Warning! Communication with ECU required.
                      Specified value

                      - Voltage[7.0...16.0] V
                      Question

                    • Is the measurement value OK?

                      Page 88


                      YES

                      The measurement value is OK.Possible cause and remedy

                    • Replace component Floor-mounted shift.
                      End of test

                      NO

                      The measurement value is not OK.Possible cause and remedy

                    • Check fuse f55 (voltage supply from control unit ESM) in component N10/1 (Front SAM control unit with fuse and relay module).
                    • Check all affected plugs, connectors and electrical components for damage, loose contact, corrosion etc. and repair if necessary.
                      End of test

                      Part 2

                      One or more messages from control unit N80 (Steering column module) are not available on the CAN bus.


                  3. Check power supply at control unit EZS.

                    Test prerequisite

                    • Battery voltage is OK.
                    • Fuse F34.f36 is OK.
                      Status of relevant actual value:
                    • Power supply:Warning! Communication with ECU required.
                      Specified value

                      - Power supply [11.0...14.5] V Question

                    • Is the actual value o.k.?

                      YES

                      The actual value is okay.Possible cause and remedy

                    • In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
                    • Check alternator.
                      End of test

                      NO

                      The actual value is not o.k.Test sequence

                    • Switch off ignition.
                    • Detach sockets A and C at component N73 (EIS [EZS] control unit).
                    • Measure direct voltage with multimeter between sockets (N73) B.2 and (N73) C.1 Specified value

                      - Voltage [11.0...14.5] V
                      Question

                    • Are the measurement values OK?

                      YES

                      The measurement values are OK.Possible cause and remedy

                    • Inspect connector B,C at control unit N73 (EIS [EZS] control unit) for damage, correct connection, loose contact and corrosion and repair, if necessary.
                    • N73 (EIS [EZS] control unit) End of test

                      NO

                      The measurement values are not OK.Possible cause and remedy

                    • Check lines between components N73 (EIS [EZS] control unit) and N10/1 (Driver-side SAM control unit with fuse and relay module) and

                      Page 89


                      repair or replace if necessary.
                    • Fuse and component F34 (Interior fuse box) Continue with button F2

          1.3.2.1.5. No further information available.


                  1. No further information available.


                  2. Check power supply at control unit A1 (Instrument cluster).


                  1. No further information available.


                  2. Check power supply at control unit N80 (Steering column module).


                    Test 1.3.2.1.7.1: Inspect control unit N80 (Steering column module) for undervoltage fault. Test 1.3.2.1.7.2: Test voltage supply of circuit 30 by means of actual value.
                    Test 1.3.2.1.7.3: Test voltage supply of circuit 30 by means of measured value. Test 1.3.2.1.7.4: Engine compartment CAN test

                    1. Inspect control unit N80 (Steering column module) for undervoltage fault.

                      If the fault code is not current, it may be deleted. In this case, the battery voltage was too low over an extended period.Charge the battery, if necessary.Question:Is the fault current in several control modules?Note:This fault could result in consequential faults. You should therefore process this fault first and then erase the fault memory.

                      YES

                      Possible cause and remedy

                      • Battery voltage too low.Test battery.Charge battery, replace if necessary.
                      • If fault occurs again:Check alternator.Communication with ECU required
                      • The quiescent current is too high.Test quiescent current.

                        NO

                        Manual check of supply voltage


                        Test prerequisite

                      • Fuse F34f33 (Fuse 33) in component F34 (Interior fuse box) is o.k.
                      • Actual value is not okay or there is a complaint.
                        Status of relevant actual value:
                      • Voltage at terminal 30:Warning! Communication with ECU required.
                        Test sequence

                      • Switch off ignition.
                      • Remove component Airbag.
                      • Please refer to WIS document AR91.60-P-0660.
                      • Remove component Multifunction steering wheel.
                      • Please refer to WIS document AR46.10-P-0100.
                      • Remove component A45 (Clock spring contact).
                      • Please refer to WIS document AR46.10-P-0200.
                      • This information can be shown using the help function (F6 button) in menu item 'Testing and repair work'.
                      • Measure direct voltage with multimeter between sockets [N80] 1.8 and [N80] 1.9 Specified value

                        - Voltage [11.0...14.5] V
                        Question

                      • Is the measurement value OK?

                        image

                        image


                        YES

                        The measurement value is OK.Possible cause and remedy

                      • Inspect connector 1 at control unit N80 (Steering column module) for damage, correct connection, loose contact and corrosion and repair, if necessary.
                        End of test

                        NO

                        The measurement value is not OK.Possible cause and remedy

                      • Plug connection at control unit N80 (Steering column module)
                      • Line between component N80 (Steering column module) and component W12 (Ground, center console)
                      • Line between component N80 (Steering column module) and component F34f33 (Fuse 33) End of test

                    2. Test voltage supply of circuit 30 by means of actual value.

                      Test prerequisites

                      • Relevant fault codes exist or a complaint has been received.
                      • Battery voltage is OK.
                      • Fuse F34f33 (Fuse 33) in component F34 (Interior fuse box) is o.k.
                        Status of relevant actual value:
                      • Voltage at terminal 30:Warning! Communication with ECU required.
                        Specified value


                        - Voltage [11.0 ... 14.5] V
                        Question:

                      • Is the actual value o.k.?

                        YES

                        The actual value is okay.Possible cause and remedy

                      • If fault code 9010/9011 occurs without complaints or function faults, erase fault memory and perform a function check.
                      • In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
                      • Check alternator.
                        End of test

                        NO

                        The actual value is not o.k.Possible cause and remedy

                      • Test voltage supply of component N80 (Steering column module) by means of measured value.
                        End of test

                    3. Test voltage supply of circuit 30 by means of measured value. Manual check of supply voltage


                      Test prerequisite

                      • Fuse F34f33 (Fuse 33) in component F34 (Interior fuse box) is o.k.
                      • Actual value is not okay or there is a complaint.
                        Status of relevant actual value:
                      • Voltage at terminal 30:Warning! Communication with ECU required.
                        Test sequence

                      • Switch off ignition.
                      • Remove component Airbag.
                      • Please refer to WIS document AR91.60-P-0660.
                      • Remove component Multifunction steering wheel.
                      • Please refer to WIS document AR46.10-P-0100.
                      • Remove component A45 (Clock spring contact).
                      • Please refer to WIS document AR46.10-P-0200.
                      • This information can be shown using the help function (F6 button) in menu item 'Testing and repair work'.
                      • Measure direct voltage with multimeter between sockets [N80] 1.8 and [N80] 1.9 Specified value

                        - Voltage [11.0...14.5] V
                        Question

                      • Is the measurement value OK?

                        image

                        image


                        YES

                        The measurement value is OK.Possible cause and remedy

                      • Inspect connector 1 at control unit N80 (Steering column module) for damage, correct connection, loose contact and corrosion and repair, if necessary.
                        End of test

                        NO

                        The measurement value is not OK.Possible cause and remedy

                      • Plug connection at control unit N80 (Steering column module)
                      • Line between component N80 (Steering column module) and component W12 (Ground, center console)
                      • Line between component N80 (Steering column module) and component F34f33 (Fuse 33) End of test

                    4. Engine compartment CAN test 1.3.2.1.7.4. No further information available.


                  1. Check power supply at control unit N71 (Headlamp range adjustment control module).

                    If the fault code is not current, it may be deleted. In this case, the battery voltage was too low over an extended period.Charge the battery, if necessary.Question:Is there a current undervoltage fault is several control modules?Note:This fault could result in consequential faults. You should therefore process this fault first and then erase the fault memory.

                    YES

                    Possible cause and remedy

                    • Battery voltage too low.Test battery.Charge battery, replace if necessary.
                    • If fault occurs again:Check alternator.Communication with ECU required
                    • The quiescent current is too high.Test quiescent current.

                      NO

                      Figure legend 1:N71 (Headlamp range adjustment control module)Figure legend 2:N10/1 (Front SAM control unit with fuse and relay module)Test prerequisite

                    • The relevant actual value is not okay.
                    • Battery voltage is OK.
                    • Fuse N10/1f51 (Fuse 51) is OK. Test sequence


                    • Switch off ignition.
                    • Disconnect connector at component N71 (Headlamp range adjustment control module).
                    • Measure direct voltage with multimeter between sockets (N71) 20 and (N71) 19
                    • Switch on ignition.
                      Specified value:Voltage = [11.0...14.5] VQuestion

                    • Is the measurement value OK?

                      image

                      image

                      YES

                      The measurement value is OK.Figure legend 1:N71 (Headlamp range adjustment control module)Figure legend 2:N10/1 (Front SAM control unit with fuse and relay module)Possible cause or remedy in case of malfunction

                    • Inspect plug connections N71x1 and (N10/1) 24 for damage, loose contact and corrosion, and repair if necessary.
                    • N71 (Headlamp range adjustment control module) End of test

                      image


                      NO

                      The measurement value is not OK.Figure legend 1:N71 (Headlamp range adjustment control module)Figure legend 2:N10/1 (Front SAM control unit with fuse and relay module)Possible cause and remedy

                      - Cable (N10/1) 24.1 - (N71) 19 is faulty .
                    • Cable (N71) 20 - W16/3 (Ground (left of component compartment, power ground)) is faulty .
                    • N10/1 (Front SAM control unit with fuse and relay module) End of test

                    image


                  2. Check power supply at control unit N93 (Central gateway control unit).


                  1. No further information available.


                    If the fault code is not current, it may be deleted. In this case, the battery voltage was too low over an extended period.Charge the battery, if necessary.Note:This fault could result in consequential faults. You should therefore process this fault first and then erase the fault memory.Question:Is the fault current in several control modules?

                    YES

                    Possible cause and remedy

                    • Battery voltage too low.Test battery.Charge battery, replace if necessary.
                    • If fault occurs again:Check alternator.Communication with ECU required
                    • The quiescent current is too high.Test quiescent current.

                      NO

                      Test prerequisite

                    • Fuse o.k.
                    • Fuse o.k.
                      Test sequence

                    • Ignition: OFF
                    • Measurement at component
                    • Measure direct voltage with multimeter between ground socket and socket Specified value

                      - Voltage[11.0...14.5] V
                      Question

                    • Is the measurement value OK? ( Picture : Example )

                      image


                      YES

                      Test sequence

                    • Unplug connector 8 at control unit N93 (Central gateway control unit).
                    • Measurement at connector 8
                    • Measure direct voltage with multimeter between sockets (N93) 8.1 and (N93) 8.6 Specified value

                      - Voltage[11.0...14.5] V
                      Question

                    • Is the measurement value OK?

                      image

                      YES

                      The measurement value is OK.Restore original status.

                    • Plug in the connector 8 at component N93 (Central gateway control unit).
                    • Switch on ignition.
                      End of test

                      NO

                      The measurement value is not OK.Possible cause and remedy in the case of undervoltage

                    • Lines between N93 (Central gateway control unit) and
                    • Lines between N93 (Central gateway control unit) and End of test


                      NO

                      The measurement value is not OK.Possible cause and remedy

                    • Lines between and
                    • G1 (Battery)
                    • G2 (generator) End of test

                  2. Check power supply at control unit Y3/8n4 (Fully integrated transmission control (VGS) control unit).

                    Operation number of operation texts and work units or standard texts and flat rates:27-0641Test sequence

                    • Switch off ignition.
                    • Separate plug connection at transmission.
                    • Measure voltage in transmission wiring harness using a multimeter.
                    • Switch on ignition.
                      Measure direct voltage with multimeter between 5 and 4Specified value:

                      - Voltage[8,5...16,4] V
                      Question

                    • Is the measurement value OK?

                      image

                      YES

                      The measurement value is OK.Possible cause of fault

                    • The conductors in the electrohydraulic control unit are interrupted.
                    • Component Y3/8n4 (Fully integrated transmission control (VGS) control unit) is defective.
                      Possible remedy

                    • Replace component Y3/8 (Electric control unit (VGS)).
                      Following the repair measures, the following checks MUST be carried out using the Diagnosis Assistance System, menu 'Initial startup'

                    • Initial startup with manual settings input for new control unit End of test

          image

          NO


          Test 1.3.2.1.10.1: The measurement value is not OK. Test 1.3.2.1.10.2: Possible cause and remedy
          Test 1.3.2.1.10.3: Test regulator and generator. 1.3.2.1.10.1. The measurement value is not OK. 1.3.2.1.10.1. No further information available.

                    1. Possible cause and remedy 1.3.2.1.10.2. No further information available.


                    2. Test regulator and generator.

                      Note on alternator testDepending on the engine variant, different alternators are installed.

                      • Alternators without networking
                      • Alternators networked with engine control unit
          Networked alternators can be diagnosed via the engine control unit.Detailed information on alternator testing can be found in WIS.Press button F2 to go to WIS documents

          1.3.2.1.10.3. No further information available.


                1. Resistance test of engine compartment CAN


                  Test 1.3.2.2.1: Test total resistance of engine compartment CAN.

                  Test 1.3.2.2.2: Test terminating resistor of component X63/4 (CAN databus adapter connector, 2-pin).

                  Test 1.3.2.2.3: Test terminating resistor of CAN element in control module N3/10 (ME-SFI [ME] control unit).

                  1. Test total resistance of engine compartment CAN.


                    Test 1.3.2.2.1.1: Perform measurement at component X63/4 (CAN databus adapter connector, 2-pin). Test 1.3.2.2.1.2: Perform measurement at component N3/10 (ME-SFI [ME] control unit).

                    1. Perform measurement at component X63/4 (CAN databus adapter connector, 2-pin). Test total resistance of engine compartment CAN.


                      Figure legend


                      • X63/4 (CAN databus adapter connector, 2-pin) Test sequence

                      • Switch off ignition.
                      • Measurement with multimeter
                      • (X63/4) 2.Measure resistance with multimeter between pins 2 and 2.1 (X63/4) Adapter cable no. W220 589 00 99 36 may be used.Specified value

                        - [55...65]ohms
                        Question:

                      • Is the measured value within the specified value range?

                        image

                        YES

                        The measurement value is OK.End of test

                        NO

                        The measurement value is not OK.Possible cause and remedy

                      • Line from component N3/10 (ME-SFI [ME] control unit) to component X63/4 (CAN databus adapter connector, 2-pin)
                      • Test terminating resistor of component X63/4 (CAN databus adapter connector, 2-pin).
                      • Test terminating resistor of CAN element in control module N3/10 (ME-SFI [ME] control unit).
                        End of test

                    2. Perform measurement at component N3/10 (ME-SFI [ME] control unit). Test total resistance of the CAN engine.


                      Test sequence

                      • Switch off ignition.
                      • Connect socket box to component N3/10 (ME-SFI [ME] control unit).
                      • Measure resistance with multimeter between sockets (F.41) 11 and (F.54) 24 of the 35-pole socket box tester.
                        Specified value


                      • Resistor[55...65]ohms Question

                      • Is the measurement value OK?

                        YES

                        The measurement value is OK.End of test

                        NO

                        The measurement value is not OK.Possible cause and remedy

                      • Line from component N3/10 (ME-SFI [ME] control unit) to component X63/4 (CAN databus adapter connector, 2-pin)
                      • Test terminating resistor of component X63/4 (CAN databus adapter connector, 2-pin).
                      • Test terminating resistor of CAN element in control module N3/10 (ME-SFI [ME] control unit).
                        End of test

                  2. Test terminating resistor of component X63/4 (CAN databus adapter connector, 2-pin). Test terminating resistor of component X63/4 (CAN databus adapter connector, 2-pin).


                    Test sequence

                    • Switch off ignition.
                    • Connect socket box to component N3/10 (ME-SFI [ME] control unit).
                    • Disconnect coupling F at component N3/10 (ME-SFI [ME] control unit).
                    • Measure resistance with multimeter between sockets (F.41) 11 and (F.54) 24 of the 35-pole socket box tester.
                      Specified value

                    • Resistor[115...125]ohms Question

                    • Is the measurement value OK?

                      YES

                      The measurement value is OK.End of test

                      NO

                      The measurement value is not OK.Possible cause and remedy

                    • Line from component X63/4 (CAN databus adapter connector, 2-pin) to component N3/10 (ME-SFI [ME] control unit)
                    • Component X63/4 (CAN databus adapter connector, 2-pin) End of test

                  3. Test terminating resistor of CAN element in control module N3/10 (ME-SFI [ME] control unit). Test terminating resistor of component N3/10 (ME-SFI [ME] control unit).


          Test sequence

          • Switch off ignition.
          • Connect socket box to component N3/10 (ME-SFI [ME] control unit).
          • Connector F is plugged in at control unit.
          • Unplug the socket F from the wiring harness at the socket box.
          • Measure resistance with multimeter between sockets (F.41) 11 and (F.54) 24 of the 35-pole socket box tester.
            Specified value

          • Resistor[115...125]ohms Question

          • Is the measurement value OK?

            YES

            The measurement value is OK.End of test

            NO

            The measurement value is not OK.Possible cause and remedy


          • Control unit N3/10 (ME-SFI [ME] control unit) End of test

              1. Test with the aid of the measuring system

                Test sequence

                • Measurement of level voltage of engine CAN buses CAN bus High and CAN bus Low with the universal oscilloscope
                • Separating one user from the connector strip X63/4 (CAN databus adapter connector, 2-pin)
                • Observe level voltage.
                • Plug in connector again at connector strip X63/4 (CAN databus adapter connector, 2-pin).
                • Repeat this procedure for all CAN users.
                  Specified value

                • As soon as the faulty branch was disconnected, the current image of the level voltage changes.
                  Possible cause of fault in the faulty branch

                • X63/4 (CAN databus adapter connector, 2-pin)
                • Test connectors and wiring for CAN of engine compartment CAN control modules.
                • Control unit
          Communication with ECU required ( Measuring system )

  2. Check the CAN communication with control unit N80 (Steering column module). Warning!Communication with ECU required.


  3. Interior CAN check Warning!Communication with ECU required.



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