Fault Code 31

Fault code 31 Fresh-air blower motor - voltage too low/ too high

Diagnostic conditions
- Ignition on
- Blower switched on

NOTE:
- No control module fault stored
- Supply voltage OK.

Possible cause of fault
- Fuse D6 faulty
- Relay for fresh-air blower faulty
- Blower regulator (end setting) faulty
- Fault in the lines between relay for fresh-air blower or blower regulator (end setting) and blower motor.

Affected terminals
Plug B, terminals 10, 11 and 12

Diagnosis/troubleshooting

Diagnosis/troubleshooting (Part 1):

Diagnosis/troubleshooting (Part 2):