Fault Code 0657

Fault code 0657

Servo motor for central vents

Diagnostic conditions
- Ignition on
- Battery voltage OK (11.4 to 14.5 V)
- Internal function test completed on air-conditioning system regulator control module

Possible causes of fault
- No or incorrect basic setting
- Short circuit to ground
- Open circuit/short circuit to B+
- Servo motor flap stiff
- Servo motor faulty
- Front air-conditioning system regulator faulty

Affected pins
Air-conditioning system regulator control module, front: Plugs A and E
- Plug A: Pin 1 'Passenger blower (servo motor for central vents)'
- Plug A: Pin 9 'Passenger blower (servo motor for central vents)'
- Plug A: Pin 14 'Passenger blower (feedback signal lead, servo motor for central vents)'
- Plug E: Pin 1 '5 V reference voltage'
- Plug E: Pin 8 'Ground signal'

Diagnosis/troubleshooting