Rear suspensionFailure modes
| 5 | Right height sensor earth | Input |
| 6 | Right height sensor signal | Input |
| C0655 |
| 1 | Driver's door switch | Input |
| 2 | Passenger and tail door switches | Input |
| 3 | Left air valve | Output |
| 4 | Right air valve | Output |
| 5 | Exhaust valve | Output |
| 6 | Air compressor (SLS relay) | Output |
| 7 | Audible warning | Output |
| 8 | SLS warning lamp | Output |
| 11 | ORM switch/ORM warning lamp | Input/Output |
| 12 | Remote handset raise/lower signal | Input |
| Connectors and pins not listed are either not used or used by the brakes system. BRAKES, DESCRIPTION AND OPERATION, Description. |
Failure modes
Failures are indicated by the SLS warning lamp in the bottom left corner of the instrument pack illuminating continuously in an amber colour. The following tables show the type of system failures and their effects on the system operation.
Height sensors
| Failure | Effect |
|---|
| Sensor output stuck at 5 V | Vehicle will not level |
| Sensor output stuck at 0 V | Vehicle will not level |
| Mechanical link between radius arm and sensor broken | Vehicle will not level |
Door Switch Inputs
| Failure | Effect |
|---|
| Harness leads for open doors are are broken or shorted to V Batt. | Air suspension levels when one or more doors are open |
| Harness leads to door(s) shorted to earth | Air suspension will not level |
SLS off-road mode switch
| Failure | Effect |
|---|
| Fault in wiring harness | Off-road mode cannot be selected |
| Failure of off-road mode switch | Off-road mode is activated when switch has not been selected |
Air supply unit air control valves
| Failure | Effect |
|---|
| Valves open or short circuit | Vehicle does not level or levels unevenly |
Air supply unit compressor
| Failure | Effect |
|---|
| Faulty relay, harness fault or compressor fault | Vehicle does not level upwards |
31 Steering & suspension
