Fault Code 30

Fault Code 30

A/C - Signal Implausible

Diagnostic conditions

NOTE: This fault can be determined only during a system test.

- Perform system test

Possible cause of fault
- Fuse D6 faulty
- Fuse C7 faulty
- Refrigerant pressure too low or non-existent
- Line fault between pressure switch, fresh-air blower relay, magnetic clutch relay, DME control module or air-conditioning compressor
- Pressure switch faulty
- Magnetic clutch relay faulty
- Fresh-air blower relay faulty
- Magnetic coupling faulty
- Air-conditioning system regulator faulty

Affected pins
Plug B, pin 16

Diagnosis/troubleshooting

Work Instruction 1 - 5:

Work Instruction 6 - 8:

Work Instruction 9 - 12:

Work Instruction 13 - 18:

Work Instruction 19 - 24:

NOTE: After remedying the fault carry out a system test.