Level Adjustment

Fault code 1399

Compressor relay

Diagnostic conditions
- Ignition on
- Internal level control module function test

Possible cause of fault
- Short circuit to B+ in the wiring of pin 31 of the level control module
- Short circuit to ground or open circuit in the wiring of pin 31 of the level control module
- Compressor relay faulty
- Level control module faulty

NOTE: If multiple valve faults (fault code 0805, 0806, 0807, 0808) are recorded, check the system's plug connections for correct contacts.

Affected pins
Level control module, plug A:
- Pin 31 'compressor relay'
- Pin 36 'compressor relay (high)'

Compressor relay, plug A:
- Pin 3F (terminal 85)
- Pin 3D (terminal 86)

Diagnosis/troubleshooting