Air Conditioning

Fault code 0668

Vehicle voltage terminal 30

Diagnostic conditions
- Ignition on
- Battery voltage OK (11.4 to 14.5 V)
- Internal function test completed on air-conditioning system regulator control module
- Engine on
- Engine speed > 2,000 rpm

Possible causes of fault
- Vehicle voltage (battery voltage) exceeded
- Vehicle voltage (battery voltage) not reached
- Short circuit to ground
- Rear air-conditioning system regulator control module faulty

Affected pins
Air-conditioning system regulator control module, front: Plug E:
- Pin 5 'Term. 30A (power supply)'
- Pin 9 'Term. 31 (ground supply line for ground pin 22)'
- Pin 10 'Term. 31 (ground supply line for ground pin 22)'

Diagnosis/troubleshooting