Kessy/Immobiliser

Fault code 0668

Vehicle voltage, terminal 30

Diagnostic conditions
- Internal KESSY control module function test

Possible cause of fault
- Lower limit value not reached (battery voltage too low)
- Short circuit to ground or open circuit in wiring
- Read out fault memory (from vehicle electrical system control module)
- Fuse faulty
- Control unit faulty

Affected pins
- Plug A on control module: Pin 1, Pin 2, Pin 4, Pin 5
- Fuse F41 (15A) in fuse carrier at left of dashboard

Diagnosis/troubleshooting

NOTE:
Visual inspection: In the next troubleshooting section, please check first that the affected pins on the KESSY control module plug connection are neither damaged nor corroded. The wiring and plugs of the affected components must also be checked for external damage and correct contacts. Repair damaged or corroded pins if 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, if necessary. On the vehicle electrical system, the voltage to the fuse (input side) must be guaranteed.