Fault Code 9150

Fault Code 9150

Spoiler control

Diagnostic conditions
- Vehicle speed higher than 120 km/h and then lower than 60 km/h
- Manual actuation

NOTE:
- From a vehicle speed of 120 km/h, the spoiler is extended and retracts again when the speed falls below 60 km/h. This is controlled via the instrument cluster.
- Micro switches attached to the spoiler control signal the state of the spoiler to the instrument cluster.
- The instrument cluster expects the check back concerning the new state of the spoiler after the speed exceeds or falls below the limit and after relevant activation. If a state change is not registered despite the control, fault code 9150 is stored and the warning text "Failure of spoiler control" is issued on the display.
- Depending on the software version of the instrument cluster, only the warning text is displayed without fault code 9150 being stored.
- The warning text is issued depending on the instrument cluster version after model year 2003.
- If the PSM control module has failed, the spoiler extends as soon as the ignition is switched on for reasons of safety.

Possible cause of fault
- Fuse D7 faulty
- Relay faulty
- Micro switch faulty
- Short circuit to ground/open circuit in the wiring between instrument cluster and relay carrier or spoiler control
- Spoiler drive faulty

NOTE: The relays are in the rear relay carrier. The spoiler is extended via relay No.3. The spoiler is retracted via relay No.9 (see wiring diagram)

Affected pins
Instrument cluster connector A, pin 6, pin 7, pin 22 and pin 23

Spoiler does not extend

Diagnosis/troubleshooting

Part 1:

Part 2:

Part 3:

Spoiler Does Not Retract