E1923

E1903

The supply voltage of component A80 (Intelligent servo module for DIRECT SELECT) is too low (undervoltage).

Possible cause:

• A80 (Intelligent servo module for DIRECT SELECT)

  Affected functions:

  
  
• Battery / On-board electrical system

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Test 1: Check power supply at control unit A80 (Intelligent servo module for DIRECT SELECT).

1. Check power supply at control unit A80 (Intelligent servo module for DIRECT SELECT).

   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.
   • Measure direct voltage with multimeter between 5 and 4 Specified value
     
     
     - Voltage[7.0...16.0] V
     Question
     
     
   • Is the measurement value OK?

     Page 178

     
     
     
     
     

     YES

     The measurement value is OK.Possible cause and remedy
     
     
   • Replace component A80 (Intelligent servo module for DIRECT SELECT).
     Additional measures
     
     
   • Perform initial startup.
   • Continue with button "F2"
     
     
     
     
     

     Initial startup

     
     
     The following procedure will guide you through all steps required to perform a complete initial startup of system ISM.Preconditions
     
     
   • The new control unit must have already been installed.
     You will be guided through the following steps
     
     
   • Detach transport protection.
   • Perform calibration.
   • Personalizing
   • Activating
     Start process with button F2.
     
     

     Warning!Communication with ECU required.

     
     

     NO

     The measurement value is not OK.Possible cause and remedy
     
     
   • Check fuse f53 (voltage supply from control unit ISM) in component N10/1 (Front SAM control unit with fuse and relay module).

     Page 179

     
     
   • Check fuse f83 (voltage supply from control unit ISM) in component F1/6 (Right instrument panel fuse box).
   • Check all affected plugs, connectors and electrical components for damage, loose contact, corrosion etc. and repair if necessary.
     End of test
     
     
     
     
     
     
     
     

     E1923

     No CAN message was received from control unit N47-5 (ESP control unit). If no customer complaint exists, the fault can be erased.

     
     

     Possible cause:

     
     
   • Check the CAN communication with control unit N47-5 (ESP control unit).
   • Vehicle dynamics CAN bus

     Affected functions:

     
     
   • CAN Communication
   • Drive position selection

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Test 1: Check the CAN communication with control unit N47-5 (ESP control unit). Test 2: Vehicle dynamics CAN test

Test 3: Chassis CAN test

1. Check the CAN communication with control unit N47-5 (ESP control unit). Warning!Communication with ECU required.

   
   
   
   

2. Vehicle dynamics CAN test Warning!Communication with ECU required.

   
   

3. Chassis CAN test

Warning!Communication with ECU required.