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
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.
1.3.2.1.5. No further information available.
1.3.2.1.6. Check power supply at control unit A1 (Instrument cluster).
1.3.2.1.6. No further information available.
1.3.2.1.7. 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.
