Rear suspension (SLABS ECU): Description and operation

SLABS ECU

1 SLABS ECU 2 Bracket 3 BCU (Ref. only) 4 ACE ECU (Ref. only) 5 Attachment nuts

The SLABS ECU is mounted on a bracket behind the passenger glove box and is identified from the other ECU's by its five connectors. The five connectors are located on the lower face of the ECU and mate with five connectors from the main harness. The twelve, six and eighteen pin connectors are used to supply inputs and outputs to and from the ECU. The remaining connectors are used for the ABS operation. BRAKES, DESCRIPTION AND OPERATION, Description.

The SLABS ECU receives a continuous battery supply from fuse 11 in the engine compartment fusebox. An ignition 'ON' signal is supplied from the ignition switch via fuse 28 in the passenger compartment fusebox. The ECU has the ability to control when it requires power and is not reliant on the ignition signal for it to power up.

The ECU incorporates a counter which times the operation of the SLS system and prevents the compressor exceeding its duty cycle. The ECU can remain powered for up to 1.5 hours after ignition off is sensed to allow the counter to continue running to avoid an ignition cycle resetting the counter.

Opening any of the doors will power up the ECU, irrespective of ignition switch position. The door open signal is sensed by the door switch completing an earth path which is sensed by the ECU. The ECU cannot differentiate between any of the doors. The door open signal powers the ECU for up to 30 minutes to allow the vehicle to re-level when a load is removed or passengers leave the vehicle.