Operation

OPERATION

General

Feed from the positive battery terminal (C0192) is supplied to the horn relay and fusible link 3 of the engine compartment fuse box (C0632) on an R wire. Fusible link 3 (C0571) is connected to the ignition switch (C0028) by an N wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 35 of the passenger compartment fuse box (C0588) on a G wire. Fuse 35 (C0580) provides an ignition feed to the following on W wires:

The cruise control master switch (C0749) The cruise control interface unit (C1959) The brake lamp switch (C0652).

The ignition switch (C0028) also provides a feed to fuse 2 of the passenger compartment fuse box (C0588) on an NW wire. Fuse 2 (C0580) provides an ignition feed to the brake pedal switch (C0075) on a G wire.

Cruise Control Master Switch

The cruise control master switch (C0749) is mounted in the centre console and is provided an ignition feed from fuse 35 of the passenger compartment fuse box (C0580) on a W wire. When the switch is pressed, current flows across the switch contacts (C0749) to the cruise control interface unit (C1959) and the cruise control ECU (C0239) on WY wires.

NOTE: When the cruise control system is switched off using the master switch, any stored road speed values will be lost.

Cruise Control ECU

When cruise control is activated, the cruise control ECU (C0239) receives a feed from the cruise control master switch (C0749) on a WY wire. The ECU (C0239) is earthed on a B wire. To enable it to control the cruise control system, the ECU receives a number of inputs from various sources as follows:

ABS ECU The ABS ECU (C0500 on 01MY vehicles, C0501 on 02MY vehicles) provides a pulsed wheel speed signal to the cruise control ECU (C0239) on a WO wire. The rate of pulses provided by the ABS ECU increases by 2.22 Hz for every mile per hour speed increase (approximately 8,000 pulses per mile travelled). This enables the cruise control ECU to calculate the road speed of the vehicle. If vehicle speed is outside the operating limits (see Description), the cruise control ECU will not activate the system.

NOTE: If the Cruise Control ECU fails to receive a pulsed wheel speed signal from the ABS modulator, cruise control will not operate.

For more information on ABS ECU operation, refer to the Anti-lock Braking System (ABS) – 01MY , or Anti-lock Braking System (ABS) – 02MY section of this manual.  ANTI-LOCK BRAKING SYSTEM (ABS) – 01MY.  ANTI-LOCK BRAKING SYSTEM (ABS) – 02MY.