Fault Code 2101

Fault code 2101

Servo motor for side vents

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

Possible causes of fault

For manual air conditioning system:
- Fault in servo motor for front air distribution, see --> chapter "Servo motor for front air distribution" in 87-1189

For 2-zone air conditioning system:
- 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 unit, front: Plugs A, C and E
- Plug A: Pin 23 'Passenger blower (servo motor for left side vents OPEN)'
- Plug A: Pin 24 'Passenger blower (servo motor for left side vents CLOSED)'
- Plug C: Pin 5 'Passenger blower (feedback signal lead, servo motor for left side vents)'
- Connector E: Pin 1 '5 V reference voltage'
- Connector E: Pin 8 'Ground signal'

Diagnosis/troubleshooting