HEATED REAR WINDOW (HRW) ................................................................ 4

ANTI-LOCK BRAKING SYSTEM (ABS) – 01MY

DESCRIPTION General

The ABS is a full time, four channel system that gives individual speed control to all four wheels to provide the vehicle with anti-lock braking (ABS), Electronic Traction Control (ETC), and Hill Descent Control (HDC). The systems are controlled by the ABS ECU, which is mounted on the rear of the ABS modulator. The ABS ECU also controls the front to rear brake balance by Electronic Braking force Distribution (EBD). This maximises vehicle stability under braking.

For a detailed description of ABS, ETC HDC, and EBD, refer to the Brakes section of the System Description and Operation Workshop manual.

The ABS modulator uses the CAN-BUS to communicate with other ECU's to enable it to control braking more efficiently. For more information on the CAN-BUS, refer to the Communication Databuses section of the Workshop manual.

OPERATION General

Feed from the positive battery terminal (C0192) is supplied to fusible link 1, fusible link 3, fusible link 8, and fusible 11 (C0632) on an R wire. All are located in the engine compartment fuse box.

Fusible link 8 (C0574) and fusible link 11 (C0570) provide constant battery feeds to the ABS modulator (C0500) on NK and NR wires respectively. The ABS modulator (C0500) is earthed on a pair of B wires.

Fusible link 1 is connected in series with fusible link 2, which is also located in the engine compartment fuse box. Fusible link 2 (C0571) provides a feed to the ignition switch (C0028) on an NR wire. Fusible link 3 (C0571) also provides a feed to the ignition switch (C0028) on an N wire.

When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 2 of the passenger compartment fuse box (C0588) on an NW wire. When in the 'ignition' position, the ignition switch (C0028) also provides a feed to fuse 7 and fuse 35 of the passenger compartment fuse box on a G wire.

Fuse 2 of the passenger compartment fuse box (C0580) provides an ignition feed to the brake pedal switch (C0075) and the HDC relay (C0574) on G wires. Fuse 35 (C0580) provides an ignition feed to the brake pedal sensor (C0652) on a W wire, and fuse 7 (C0582) provides an ignition feed to the ABS ECU (C0500), also on a W wire.

Wheel Speed Sensors

The ABS ECU (C0500) supplies a feed to all four wheel speed sensors as follows: To the LH front wheel speed sensor (C0516) on a G wire. To the RH front wheel speed sensor (C0517) on a G wire. To the LH rear wheel speed sensor (C0502) on a W wire. To the RH rear wheel speed sensor (C0503) on a W wire.

The wheel speed sensors provide the ABS ECU with a square wave form signal. By measuring the frequency of the wave form, the ABS ECU can calculate the speed of the road wheel. The sensors provide the ABS ECU (C0500) with wheel speed signals as follows: From the LH front wheel speed sensor (C0516) on a G wire. From the RH front wheel speed sensor (C0517) on a G wire. From the LH rear wheel speed sensor (C0502) on a W wire. From the RH rear wheel speed sensor (C0503) on a W wire.

If the ABS ECU detects wheel deceleration is too great, it will initiate the ABS. If the ABS ECU detects that wheel speed is greater than vehicle speed, it will initiate ETC. If HDC is operational, the ABS ECU will control vehicle speed at 7 mph (11 km/h) by applying the brakes where necessary. For more information on ABS, ETC, and HDC, refer to the Brakes section of the System Description and Operation Workshop manual.

ABS ECU Td4 (Manual Transmission)

The ABS ECU (C0500) provides a road wheel speed signal to the Engine Control Module (ECM) (C0331) via the CAN BUS on YN (low) and YB (high) wires.

Td4 (Automatic Transmission)

The ABS ECU (C0500) provides a road wheel speed signal to the Automatic Transmission Control Unit (ATCU) (C0932) via the CAN BUS on YN (low) and YB (high) wires.

K1.8

The ABS ECU (C0500) provides a road wheel speed signal to the Engine Control Module (ECM) (C0913) via the CAN BUS on YN (low) and YB (high) wires.

KV6

The ABS ECU (C0500) provides a road wheel speed signal to the ATCU (C0932) via the CAN BUS on YN (low) and YB (high) wires. This information is relayed to the ECM (C0371) via the CAN BUS on YN (low) and YB (high) wires.

For more information on the CAN BUS, refer to the Communication Databuses section of the System Description and Operation Workshop manual.

Brake Pedal Sensor

The brake pedal sensor is a Hall effect sensor, located at the top of the brake pedal. The sensor (C0652) is provided an ignition feed from fuse 35 of the passenger compartment fuse box (C0580) on a W wire. The sensor (C0652) is earthed on a B wire.

When the brake pedal is pressed, the brake pedal sensor (C0652) provides a feed to the following components: To the Engine Control Module (ECM) (C0331) on a PG wire (Td4 vehicles only). To the ECM (C0331) on a GR wire (Td4 vehicles only). To the Automatic Transmission Control Unit (ATCU) (C0932) on a GR wire (automatic transmission vehicles only). To the Cruise control ECU (C0239) on a PG wire (KV6 vehicles only). To the cruise control interface unit (C0895) on a PG wire (KV6 vehicles only). To the cruise control interface unit (C0895) on a GR wire (KV6 vehicles only).

For more information on the Jatco automatic transmission, refer to the Electronic Automatic Transmission (EAT) – 01MY section of this manual. + ELECTRONIC AUTOMATIC TRANSMISSION (EAT) – 01MY.

For more information on KV6 cruise control operation, refer to the Cruise Control – KV6 section of this manual. + CRUISE CONTROL – KV6.