Operation

OPERATION

General

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

The earth path for the main relay (C0576) is controlled by the ECM (C0603) on a WK wire. The energised main relay provides a feed to fuse 4, which is also located in the engine compartment fuse box. For more information on main relay operation, refer to the Engine Management System – EDC section of the System Description and Operation Workshop manual.

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.

Cruise Control Master Switch

Cruise control is switched on and off by pressing the master switch mounted on the centre console. Fuse 35 of the passenger compartment fuse box (C0580) supplies the cruise control master switch (C0749) an ignition feed on a W wire. When the switch is pressed, current flows across the switch contacts (C0749) to the cruise control interface unit (C1959) on a WY wire.

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

Cruise Control Interface Unit

Fuse 4 of the engine compartment fuse box (C0575) provides a feed to the cruise control interface unit (C1959) on an NK wire. The interface unit (C1959) 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) provides a road speed signal to the cruise control interface unit (C1959) via the CAN-BUS on YN (Low) and YB (High) wires. For more information on the CAN-BUS road speed signal, refer to the Communication Databuses section of the Workshop manual.