Heating System H02

Fault code 27

Central flap motor - No reaction to activation, signal unclear

Diagnostic conditions
- Ignition on
- No control module fault stored
- No fault with power supply sensors (5 V) stored

Possible cause of fault
- Short circuit to B+/ground/between one another or open circuit in the wiring between the air-conditioning system regulator and the central flap.
- Central flap stiff
- Drive motor for central flap faulty
- Air-conditioning system regulator faulty

Affected pins
Connector B, pin 9, pin 14, and pin 20
Plug D, pin 4 and pin 12

Diagnosis/troubleshooting