Operation

SLS Operation

Air supply unit

Compressor
When compressor operation is required, the SLABS ECU supplies an output feed from pin C0655-6 on an NP wire to the engine compartment fusebox. The feed is connected to the coil of the SLS relay closing the relay contacts. The coil is connected from the fusebox on a B wire, via header C0286 LHD/ C0288 RHD to earth header C0018

The feed from fusible link 9 passes through the relay contacts and is connected from the engine compartment fuse box on a WB wire to the SLS compressor. The compressor is connected on a B wire, via splice joint A47, to earth eyelet connector C0811-1.

SLS exhaust valve
When exhaust valve operation is required, the SLABS ECU outputs a feed on pin C0655-5 on a BW wire to the exhaust valve. The valve is connected on a B wire, via splice joint A47 to earth eyelet connector C0811-1

SLS LH rear valve
When LH rear valve operation is required, the SLABS ECU outputs a feed on pin C0655-3 on a WY wire to the valve The valve is connected on a B wire, via splice joint A47 to earth eyelet connector C0811-1

SLS RH rear valve
When RH rear valve operation is required, the SLABS ECU outputs a feed on pin C0655-4 on a UO wire to the valve. The valve is connected on a B wire, via splice joint A47 to earth eyelet connector C0811-1

Off-road mode switch
When the non-latching off-road mode switch is pressed an earth path is completed from SLABS ECU pin C0655-11 on a PK wire, via splice joint A186 to the off-road mode switch. The switch is connected on a B wire, via headers C0725 and C0760 to earth header C0017 LHD/C0018 RHD.

The momentary completion of the earth path is sensed by the ECU which then operates the air supply unit accordingly The ECU then connects pin C0655-11 to earth The earth is also connected to the off-road mode warning lamp in the instrument pack on a PK wire from splice joint A186, causing the warning lamp to illuminate. The ECU quickly removes and re-instates the earth path continuously to check if a second off-road mode switch request has been made

Door switches
The SLABS ECU receives earth input signals from the door switches to inform the ECU that a door is open. The ECU can only differentiate between the driver's door on ECU pin C0655-1 and the remaining doors on pin C0655-2.

Driver's door
The earth input for ECU pin C0655-1 is connected on a PW wire, via headers C0287 LHD/C0285 RHD, to the front (driver's) door lock motor The motor is connected on a B wire to earth header C0017 LHD/C0018 RHD.

Passenger door
The earth input for ECU pin C0655-2 is connected on a PLG wire to header C0291 LHD/C0285 RHD From the header a PLG wire is connected to connector interface C0464-1/C0733-1. A PW wire connects the front (passenger) door lock motor to the connector interface. The motor is connected on a B wire to earth header C0018 LHD/C0017 RHD

LH and RH rear doors
The earth input for ECU pin C0655-2 is connected on a PLG wire to header C0291 LHD/C0285 RHD From the header PLG wires connect to the LH and RH rear door lock motors. Each motor is connected on a B wire to earth header C0552.

Tail door
The earth input for ECU pin C0655-2 is connected on a PLG wire to header C0291 LHD/C0285 RHD From the header a PLG wire connects to the tail door motor switch. The motor is connected on a B wire to earth header C0706.

Body Control Unit (BCU)
The SLABS ECU provides outputs and receives inputs to/from the BCU on connectors C0655 and C0504 as follows:
^ An output is passed from SLABS ECU pin C0655-7 to BCU pin C0660-10 on a WK wire. This output enables the SLS audible warning.
^ An input is received from BCU pin C0660-12 to SLABS ECU C0655-12 on a WU wire. This input is the SLS raise/lower command from the remote handset.

Instrument pack
The SLABS ECU provides an output from pin C0655-8 on a WO wire to the instrument pack pin C0233-2 for SLS warning lamp operation.

Height sensors
The SLABS ECU provides outputs and receives inputs from the left and right hand height sensors as follows

LH height sensor
^ Power supply output from SLABS ECU pin C0654-1 on an SY wire to LH height sensor pin C0764-5.
^ Earth output from SLABS ECU pin C0654-2 on an SU wire to LH height sensor pin C0764-1.
^ Signal input from LH height sensor pin C0764-4 on an SR wire to SLABS ECU pin C0654-3.

RH Height sensor
^ Power supply output from SLABS ECU pin C0654-4 on an SG wire to RH height sensor pin C0763-5.
^ Earth output from SLABS ECU pin C0654-5 on an SO wire to RH height sensor pin C0763-1.
^ Signal input from RH height sensor pin C0763-4 on an SB wire to SLABS ECU pin C0654-6.

Engine Control Module (ECM)
The ECM provides an engine speed signal on a WS wire to header C0291. From the header the signal is passed on a WS wire to the instrument pack for tachometer operation A second WS wire is connected from the header to the SLABS ECU pin C0655-10

ABS Operation
Refer Anti-lock Braking System (ABS) - Operation for description of the ABS circuit.