Rear suspension (Operation): Description and operation

Operation

Circuit diagram

1 SLABS ECU 2 Exhaust valve 3 Restrictor 4 Pressure limiting valve 5 Silencer 6 Inlet air filter 7 Compressor 8 Air dryer

9 Non-return valve 10 RH air control valve 11 RH air spring 12 RH height sensor 13 LH height sensor 14 LH air spring 15 LH air control valve

The SLS system is active when the ignition switch is in position II, when one or more doors are open and for up to thirty minutes after all doors have been closed. If the rear axle is articulated by more than 100 mm (3.93 in), the ECU will not activate the SLS system.

The air supply unit compressor will only operate to raise the rear of the vehicle when the engine is running, with the exception of the remote handset operation which does not require the engine running. Three modes of SLS operation are available; Normal Ride Height, Off-Road Mode (ORM) and Extended Mode. A fourth mode, transportation mode, is programmed by TestBook for transport or recovery of the vehicle on a trailer.