Fault Code 1596

Fault code 1596

Servo motor for fresh-air/recirculation 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
- Short circuit to B+/ground/to each other or open circuit
- Servo motor flap stiff
- Servo motor faulty
- Air-conditioning system regulator faulty

Affected pins
- 2-zone and 4-zone air conditioning systems

Air-conditioning system regulator control module, front: Plugs A and E
- Plug A: Pin 3 'Fresh-air/recirculation valve (feedback signal lead, servo motor for fresh-air/recirculation valve)'
- Plug A: Pin 17 'Fresh-air/recirculation valve (servo motor for fresh-air/recirculation valve OPEN)'
- Plug A: Pin 18 'Fresh-air/recirculation valve (servo motor for fresh-air/recirculation valve CLOSED)'
- Plug E: Pin 1 '5 V reference voltage'
- Plug E: Pin 8 'Ground signal'
- Manual air conditioning

Air-conditioning system regulator control module, front: Plug A
- Plug A: Pin 19 'Fresh-air/recirculation valve (servo motor for fresh-air/recirculation valve OPEN)'
- Plug A: Pin 20 'Fresh-air/recirculation valve (servo motor for fresh-air/recirculation valve CLOSED)'

Diagnosis/troubleshooting
- 2-zone and 4-zone air conditioning systems












- Manual air conditioning