Work Instruction 19 - 24
NOTE: After remedying the fault carry out a system test.
Fault Code 31
Fault Code 31
Fresh-Air Blower Motor - Voltage Deviation Too Small/Too Great
Diagnostic conditions
- Ignition on
- Blower switched on
- No control unit fault stored
- No sensor supply voltage fault stored (5 V)
Possible cause of fault
- Fuse C7 faulty
- Fuse D6 faulty
- Fault in lines between fresh-air blower relay or blower regulator (driver) and fresh-air blower.
- Fresh-air blower relay faulty
- Blower regulator (driver) faulty
- Air-conditioning system regulator faulty
Affected pins
Plug B, pins 10, 11 and 12
Diagnosis/troubleshooting
Work Instruction 1 - 2