Description

Self Levelling And Anti-Lock Braking System (SLABS)

NOTE: This Description and Operation applies to vehicles with Self Levelling Suspension (SLS).

SLABS Description
SLS and ABS is controlled by the Self Levelling and Anti-Lock Braking System (SLABS) ECU. The two systems are housed in the one ECU, but operate independently of each other.

The SLS system comprises an air supply unit comprising a compressor and air valves two height sensors and the SLS part of the SLABS ECU. The SLS system controls the height of the rear suspension for off-road driving and passenger/load compensation.

The ABS system comprises ABS wheel sensors an ABS modulator and the ABS part of the SLABS ECU. The ABS system also controls electronic brake distribution hill descent control center differential lock control and electronic traction control.

SLABS Supply

Circuit supply
A feed from the battery positive terminal is connected by an R wire to the engine compartment fusebox where it passes through fusible links 8, 9 and 11 and fuse 11.

The feed from fusible link 11 is connected to the contacts of the ABS return pump relay in the engine compartment fusebox.

The feed from fusible link 9 is connected to the contacts of the SLS relay in the engine compartment fusebox.

The teed from fuse 11 is connected to the SLABS ECU pin C0504-1 on an NK wire.

The feed from fusible link 8 is connected to the passenger compartment fusebox on an NW wire and from the fusebox to the ignition switch on an N wire

Ignition switch supply
When the ignition switch is in position II the feed from fusible link 8 flows through the ignition switch to the passenger compartment fusebox on a Y wire and passes through fuses 25, 27 and 28.

From fuse 25 is connected to the contacts of the hill descent relay in the passenger compartment fusebox. The feed from fuse 25 is also connected on a GY wire to the reverse lamp switch (manual gearbox vehicles) or the starter inhibitor/reverse lamp switch (automatic gearbox vehicles) When the switch is operated, the feed is connected on a GN wire through header joint C0287 LHD/C0294 RHD to the SLABS ECU pin C0504-7.

From fuse 27 the feed is connected via header C0760 on an LG wire to the hill descent switch. When the hill descent switch is operated, the feed continues from the switch on a PS wire to the SLABS ECU pin C0504-14.

From fuse 28 the feed is connected on an LG wire to the SLABS ECU pin C0504-2.