Tuesday, 26 November 2019

2010 Mercedes Benz C 300 (204.054) V6-3.0L (272.947) Page 2019


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



Test prerequisite



- Battery voltage is OK.



- Fuse F34f29 (Fuse 29) 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)

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