2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 1968

Test 1.1.3.2.1.9: Check power supply at control unit N63/1 (DTR control module).

Test 1.1.3.2.1.10: Check power supply at control unit N71 (Headlamp range adjustment control module).

Test 1.1.3.2.1.11: Check power supply at control unit N73 (EIS [EZS] control unit).

Test 1.1.3.2.1.12: Check power supply at control unit N80 (Steering column module).

Test 1.1.3.2.1.13: Check power supply at control unit Y3/8n4 (Fully integrated transmission control (VGS) control unit).

1.1.3.2.1.1. 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)

End of test

NO

The measurement value is not OK.Possible cause and remedy

- Line between component A1 (Instrument cluster) and component N10/1 (Front SAM control unit with fuse and relay module)

- Lines between A1 (Instrument cluster) and W28/1 (Ground, left inner door sill)

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

End of test

1.1.3.2.1.2. Check power supply at control unit A89 (DTR controller unit).

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

Figure legend

- A89 (DTR controller unit)

Test prerequisite

- The voltage test at component G1 (Battery) is o.k.

- Fuse 45 in component N10/1 (Driver-side SAM control unit with fuse and relay module) is o.k.

Test sequence

- Switch off ignition.

- Detach coupling at component A89 (DTR controller unit).

- 1.Measure direct voltage with multimeter between sockets 1 and 1.6