Operation

ABS Operation

HDC Brake lamp operation
When the hill descent control operates, the SLABS ECU pin C0506-12 provides a power supply on a BG wire to the coil of the hill descent relay in the passenger compartment fusebox. The relay coil energises and the contacts close. The earth path from the coil is from the passenger compartment fusebox on a B wire to earth header C0017 LHD/C0018 RHD.

The feed from fuse 25 in the passenger compartment fusebox passes through the closed relay contacts and is connected from the fusebox on a GP wire, through header C0287 LHD/C0290 RHD to header C0295.

The feed is then connected to the LH tail lamp on a GP wire and illuminates the brake lamp bulb. The feed is also connected from the header C0295 to header C0723 on a GP wire. From the header C0723 the feed is connected on GP wires to the RH tail lamp the high mounted brake lamp and the trailer socket, illuminating the brake lamp bulbs.

ABS return pump operation
When the ABS or other ABS related functions operate the SLABS ECU pin C0506-15 provides a power supply on a WO wire to the coil of the ABS return pump relay in the engine compartment fusebox. The relay coil energises and the relay contacts close. The earth path from the coil is from the engine compartment fusebox on a B wire, via header C0286 LHD/C0288 RHD to earth header C0018.

The feed from fusible link 11 in the engine compartment fusebox passes through the closed contacts and is connected from the fusebox on an NR wire to splice joint A306. The feed continues from splice joint A306 on an NR wire to the SLABS ECU pin C0504-8. The feed is also connected from the splice joint A306 on an NR wire to the ABS return pump The earth path from the ABS return pump is on a B wire to earth eyelet connector C0562-1.

Differential lock unit switch operation
When the differential lock unit switch is operated, an earth path is completed from the SLABS ECU pin C0506-9, via header C0761 to the differential lock unit switch on a BU wire

On vehicles with automatic transmission the earth path is completed from the switch on a B wire to splice joint SJ2 From the splice joint the earth is connected on a B wire to earth header C0552.

On vehicles with manual transmission the earth path is completed from the switch on a B wire to splice joint A33. From the splice joint the earth is connected on a B wire to earth header C0552.

When the differential lock unit switch completes the earth path, the SLABS ECU interprets the earth as a signal. Simultaneously, the closure of the switch also completes an earth path from the instrument pack on a BU wire to header C0761, through the differential lock unit switch to the earth header C0552. This earth is used by the instrument pack to illuminate the differential lock warning lamp.

Transmission high/low switch operation
When the transmission high/low switch is operated, an earth path is completed from the SLABS ECU pin C0504-11, via header C0290 LHD/C0288 RHD to the transmission high/low switch on an RK wire.

On vehicles with automatic transmission, the earth path is completed from the switch on a B wire to splice joint SJ2 From the splice joint the earth is connected on a B wire to earth header C0552.

On vehicles with manual transmission, the earth path is completed from the switch on a B wire to splice joint A33. From the splice joint the earth is connected on a B wire to earth header C0552.

When the transmission high/low switch completes the earth path, the SLABS ECU interprets the earth as a signal to confirm that the transfer box is in low range.

ABS sensors
The SLABS ECU receives inputs from each wheel speed sensor through connector C0505. The inputs are as follows:
^ From Front LH ABS sensor pins C0516-1/2 to SLABS ECU pins C0505-1/2 on G wires
^ From Front RH ABS sensor pins C0517-1/2 to SLABS ECU pins C0505-4/5 on G wires
^ From Rear LH ABS sensor pins C0502-1/2 to SLABS ECU pins C0505-7/8 on W wires
^ From Rear RH ABS sensor pins C0503-1/2 to SLABS ECU pins C0505-3/6 on W wires.

ABS modulator
The SLABS ECU provides outputs to and receives inputs from the ABS modulator through connector C0506. The inputs and outputs are as follows:
^ Output from SLABS ECU pin C0506-1 to ABS modulator pin C0501-1 on an SW wire
^ Output from SLABS ECU pin C0506-2 to ABS modulator pin C0501-2 on an SR wire
^ Input from ABS modulator pin C0501-8 to SLABS ECU pin C0506-3 on a BS wire
^ Output from SLABS ECU pin C0506-4 to ABS modulator pin C0501-13 on an SG wire
^ Output from SLABS ECU pin C0506-5 to ABS modulator pin C0501-12 on an SU wire
^ Input from ABS modulator pin C0501-9 to SLABS ECU pin C0506-6 on a YG wire
^ Output from SLABS ECU pin C0506-7 to ABS modulator pin C0501-5 on an SY wire
^ Output from SLABS ECU pin C0506-8 to ABS modulator pin C0501-4 on an SN wire
^ Output from SLABS ECU pin C0506-10 to ABS modulator pin C0501-10 on an SP wire
^ Output from SLABS ECU pin C0506-11 to ABS modulator pin C0501-11 on an SK wire.

The ABS modulator (D124) is connected on a B wire to earth eyelet connector C0561-1.

Instrument pack
The SLABS ECU provides outputs to the instrument pack through connector C0504. The outputs are as follows.
^ From SLABS ECU pin C0504-16 to instrument pack pin C0233-5 on a WY wire (HDC warning lamp)
^ From SLABS ECU pin C0504-17 to instrument pack pin C0233-10 on a WK wire (HDC info warning lamp)
^ From SLABS ECU pin C0504-18 to instrument pack pin C0233-3 on a WR wire (ABS warning lamp)
^ From SLABS ECU pin C0504-13 to instrument pack pin C0233-4 on a WU wire (TC warning lamp)
^ From SLABS ECU pin C0504-9 via header joint C0293 LHD/C0285 RHD on a KO wire (brake warning lamp).

The instrument pack is also connected from the instrument pack pin C0233-16 on an SK wire, via header C0292 LHD/C0290 RHD to the IDM in the passenger compartment fusebox. The SK wire is the serial data bus between the IDM and the instrument pack.

Diagnostic socket
The SLABS ECU provides outputs and receives inputs from the diagnostic socket through connector C0504. Connector pin C0504-5 is connected on a K wire, via header C0286 to the diagnostic socket pin C0040-7.

Body Control Unit (BCU)
The SLABS ECU pin C0504-15 receives an input from the BCU pin C0662-10 on a GB wire. This signal is used by the ABS system for automatic transmission in neutral for HDC control.

Engine Control Module (ECM)
On V8 engine vehicles the SLABS ECU outputs a rough road signal to the ECM from SLABS ECU pin C0504-4 on an RG wire to ECM pin C0637-34 The rough road signal inhibits misfire detection on NAS vehicles. The SLABS ECU receives engine data from the ECM from ECM pin C0636-29 on an SP wire to SLABS ECU pin C0504-10

On Td5 engine vehicles the SLABS ECU receives engine data from ECM pin C0658-32 on an SP wire to SLABS ECU pin C0504-10

Road speed signal
The SLABS ECU outputs a road speed signal from pin C0504-3 on a KG wire to header C0290. From header C0290 the road speed signal is passed on KG wires to the following ECU pins:
^ Cruise control ECU pin C0239-15
^ Engine Control Module (ECM pin C0637-22 on V8 engine vehicles and pin C0658-13 on Td5 engine vehicles
^ Active Cornering Enhancement (ACE) ECU pin C0647-5
^ ICE Tuner/Amplifier pin C0491-20
^ Instrument pack pin C0230-16
^ Air Temperature Control (ATC) ECU pin C0792-2 via splice joint A87.