2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 1091

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2.1.3.1.2. No further information available.

2.1.3.2. Measurements with multimeter on CAN network

Test 2.1.3.2.1: Voltage supply of engine compartment CAN control modules

Test 2.1.3.2.2: Resistance test of engine compartment CAN

2.1.3.2.1. Voltage supply of engine compartment CAN control modules

Test 2.1.3.2.1.1: Check power supply at control unit A1 (Instrument cluster).

Test 2.1.3.2.1.2: Check power supply at control unit A89 (DTR controller unit).

Test 2.1.3.2.1.3: Check power supply at control unit N3/10 (ME-SFI [ME] control unit).

Test 2.1.3.2.1.4: Check power supply at control unit N15/3 (ETC [EGS] control unit).

Test 2.1.3.2.1.5: Check power supply at control unit N15/5 (Electronic selector lever module control unit).

Test 2.1.3.2.1.6: Check power supply at control unit N15/6 (Sprintshift control module).

Test 2.1.3.2.1.7: Check power supply at control unit N47-5 (ESP, SPS [PML] and BAS control unit).

Test 2.1.3.2.1.8: Check power supply at control unit N51 (AIRmatic with ADS control module).

Test 2.1.3.2.1.9: Check power supply at control unit N63/1 (DTR control module).

Test 2.1.3.2.1.10: Check power supply at control unit N71 (Headlamp range adjustment control module).

Test 2.1.3.2.1.11: Check power supply at control unit N73 (EIS [EZS] control unit).

Test 2.1.3.2.1.12: Check power supply at control unit N80 (Steering column module).

Test 2.1.3.2.1.13: Check power supply at control unit Y3/8n4 (Fully integrated transmission control (VGS) control unit).

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

Test prerequisites

- The fuses are OK.

- The power supply of the control unit N10/1 (Front SAM control unit with fuse and relay module) is OK.

Test sequence

- Switch off ignition.

- Detach the socket at component A1 (Instrument cluster).

- Measure direct voltage with multimeter between sockets (A1) 1 and (A1) 6

- Measure direct voltage with multimeter between sockets (A1) 2 and (A1) 6

- Measure direct voltage with multimeter between sockets (A1) 3 and (A1) 6

- Switch on ignition.

Specified value

- Voltage [11.0...14.5] V

Question:Is the measurement value OK?

YES

The measurement value is OK.Possible cause and remedy

- Perform inspection of connector and of socket for bent pins and enlarged contacts.

- Control unit A1 (Instrument cluster)