Self levelling suspension and ABS (Body control unit)

Self levelling suspension and ABS

The BCU communicates with the SLABS ECU for several functions: l An output is provided from the SLABS ECU to the BCU to provide the logic conditions for issuing the SLS audible warning. l The BCU receives an input from the SLABS ECU relating to the raise/ lower command from the remote handset.

REAR SUSPENSION, DESCRIPTION AND OPERATION, Description - SLS.

Hill descent control

The BCU provides an output signal to the SLABS ECU for automatic transmission in neutral for HDC control. The BCU checks the status of the ignition and 'gearbox state' inputs and provides a 'Neutral selected' output. If the ignition is on and 'gearbox state' is Neutral, the 'Neutral selected' output is on, otherwise 'Neutral selected' is off. BRAKES, DESCRIPTION AND OPERATION, Description.

Heated screens

The Heated Front Screen (HFS) is fitted for some market destinations and is operated from a non-latching switch located on the instrument pack cowl. The BCU will only allow the heated front screen to operate when the engine is running and controls the time-out period for switching the circuit off.

The heated front screen operation can also be controlled from the Automatic Temperature Control (ATC) ECU on vehicles fitted with air conditioning.

The heated rear window will only function when the engine is running, and is operated by a non-latching switch on the instrument pack cowl. The heated rear window can also be operated by the ATC ECU on vehicles fitted with air conditioning.

Interior courtesy lamps

The BCU controls the operation of the interior courtesy lamps. The courtesy lamps are situated in the front, mid and rear areas of the headlining.

Fuel flap actuator

The BCU provides an earth path to the fuel flap release solenoid to allow the fuel filler flap to be opened. This is only allowed if the alarm system is not set and all other conditions have been satisfied. The fuel flap release switch is located in the fascia switch pack and it receives a voltage supply from the passenger compartment fuse box.

Audible warnings

The BCU can request the instrument pack to generate an audible warning in response to conditions it has detected and which need to be drawn to the driver's attention. One of six different audible warnings can be requested by the BCU.