Fault Code 0849
Fault code 0849S contact on ignition starting switch
NOTE: This fault was detected by the 'rear convenience system' control unit
Diagnostic conditions
- Ignition on
- Battery voltage Ok (11.4 to 14.5 V)
- Internal rear convenience system control unit function test
- Vehicle speed > 15 km/h
Possible causes of fault
- Ignition starting switch faulty
- Instrument cluster faulty
- Rear convenience system control unit faulty
Affected pins
-
Diagnosis/troubleshooting
NOTE:
Visual inspection: In the next troubleshooting section, please check first that the affected pins on the rear convenience system control unit plug connection are neither damaged nor corroded. The wiring and plugs of the affected components must also be checked for external damage and proper contact Repair damaged or corroded pins it possible, otherwise replace affected pins. Repair or replace damaged wires.
NOTE:
Sporadic faults: In the event of faults that occur sporadically, the wiring positions that are linked to moving parts on and in the vehicle must be checked for each system. Various statuses that can cause faults must be simulated with the help of the wiring diagram.
NOTE:
Battery voltage: A battery voltage of between 11.4 and 14.5 V is required for the following troubleshooting procedure. This must be checked and provided, it necessary. On the vehicle electrical system, the voltage to the fuse (input side) must be guaranteed.
NOTE: Implausible signal --> This fault is detected if the key is not in the ignition starting switch and the following conditions are met
- 'Terminal 15 on'
or
- 'Vehicle speed > 0 km/h'
