Air Conditioning

Fault Code 0538

Reference voltage (5 V sensor supply voltage)

Diagnostic conditions
- Ignition on for min. 10 s.
- 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+
- Short circuit to ground
- Air-conditioning system regulator faulty

Affected pins
- 2-zone and 4-zone air conditioning systems Front air-conditioning system regulator control module: Plug E, pin 1 5 V reference voltage
- Manual air conditioning Front air-conditioning system regulator control module: Plug E, pin 1 5 V reference voltage

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

Work Instruction 1 - 3:

Work Instruction 1 - 3: