Fault Code 1810

Fault Code 1810

Servo motor for right temperature valve

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

Possible causes of fault
- No or incorrect basic setting
- Short circuit to ground
- Open circuit/short circuit to B+
- Servo motor flap stiff
- Servo motor faulty
- Front air-conditioning system regulator faulty

Affected pins
Air-conditioning system regulator control module, front: Plugs A and E
- Plug A: Pin 12 Right temp. valve (feedback signal lead for right temperature valve)
- Plug A: Pin 19 Right temp. valve (right temperature valve OPEN)
- Plug A: Pin 20 Right temp. valve (right temperature valve CLOSED)
- Plug E: Pin 1 5 V reference voltage
- Plug E: Pin 8 Ground signal

Diagnosis/troubleshooting

Work Instruction 1 - 3:

Work Instruction 4 - 5:

Work Instruction 6 - 10: