Fault Code 28

Fault Code 28

Footwell/Defroster Flap Motor - No Reaction To Activation, Signal Implausible

Diagnostic conditions
- Ignition on
- No control unit fault stored
- No sensor supply voltage fault stored (5 V)

Possible cause of fault
- Short circuit to B+/ground/between wires or open circuit in wiring between air-conditioning system regulator and footwell/defroster flap
- Footwell/defroster flap stiff
- Footwell/defroster flap drive motor
- Air-conditioning system regulator faulty

Affected pins
Plug B, pins 3, 9 and 20
Plug D, pins 3 and 11

Diagnosis/troubleshooting

Work Instruction 1 - 3:

Work Instruction 4 - 8:

Work Instruction 9 - 12: