Fault Code 31

Fault Code 31

Fresh-Air Blower Motor - Voltage Deviation Too Small/Too Large

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

Possible cause of fault
- Fuse C 7 faulty
- Fuse D 6 faulty
- Fault in the lines between relay for fresh-air blower or blower regulator (end setting) and fresh-air blower.
- Relay for fresh-air blower faulty
- Blower regulator (end setting) faulty
- Air-conditioning system regulator faulty

Affected pins
Connector B, pin 10, pin 11, and pin 12

Diagnosis/troubleshooting

Work Instruction 1 - 2:

Work Instruction 3 - 5:

Work Instruction 6 - 8:

Work Instruction 9 - 13:

Work Instruction 14 - 19: