Fault Code 1863

Fault Code 1863

Passenger blower, rear left tunnel

Diagnostic conditions
- Ignition on
- Battery voltage OK (11.4 to 14.5 V)
- Internal function test completed on rear air-conditioning system regulator control module

Possible causes of fault
- Short circuit to B+
- Short circuit or open circuit
- Short circuit to ground
- Servo motor flap stiff
- Servo motor faulty
- Rear air-conditioning system regulator faulty

Affected pins
Air-conditioning system regulator control module, rear: Plugs B, C and D
- Plug B: Pin 9 Passenger blower (passenger blower, rear left tunnel OPEN)
- Plug C: Pin 2 Passenger blower (passenger blower, rear left tunnel CLOSED)
- Plug C: Pin 16 Passenger blower (feedback signal lead, passenger blower, rear left tunnel)
- Plug D: Pin 3 5 V reference voltage
- Plug D: Pin 7 Ground signal

Diagnosis/troubleshooting

Work Instruction 1 - 3:

Work Instruction 4 - 5:

Work Instruction 6 - 10: