ANTI-LOCK BRAKING SYSTEM (ABS) – 02MY ............................................ 4

Set + Switch

A constant battery feed is supplied to the rotary coupler (C0082) via the horn relay (C0576) on a PY wire. Current flows across the rotary coupler (C1254) to the cruise control switches. The Set + switch is a normally open, non-latching switch. When the switch is pulled forward, the switch contacts close. Current flows across the switch back to the rotary coupler. The rotary coupler (C0082) is connected to the cruise control interface unit (C1959) by an RW wire.

The interface unit (C1959) converts the signals received from the Set + switch, and relays information to the Engine Control Module (ECM) (C0331) on an RG wire. The signal provided by the interface unit is a continuous, pulsed voltage, varying from approximately 6 V to 8 V. By measuring the frequency of the pulses, the ECM is able to control vehicle speed in accordance to requests from the Set + switch.

Res switch

A constant battery feed is supplied to the rotary coupler (C0082) via the horn relay (C0576) on a PY wire. Current flows across the rotary coupler (C1254) to the cruise control switches. The Res switch is a normally open, non-latching switch. When the switch is pulled forward, the switch contacts close. Current flows across the switch back to the rotary coupler. The rotary coupler (C0082) is connected to the cruise control interface unit (C1959) by a UW wire.

The interface unit (C1959) converts the signals received from the Res switch, and relays information to the ECM (C0331) on an RG wire. The signal provided by the interface unit is a continuous, pulsed voltage, varying from approximately 6V to 8V. By measuring the frequency of the pulses, the ECM is able to control vehicle speed in accordance to requests from the Res switch.

Brake Pedal Switch

Fuse 35 of the passenger compartment fuse box (C0580) provides an ignition feed to the hall effect brake pedal switch (C0652) on a W wire. The brake pedal switch (C0652) is earthed on a B wire.

When the brake pedal is in the rest position, only a nominal voltage (between approximately 0 V and 2 V) is supplied to the ECM (C0331) on GR and PG wires. When the brake pedal is pressed, this voltage rises to approximately battery voltage. Sensing this increase, the ECM suspends cruise control operation.

Electronic Automatic Transmission (EAT) ECU

When cruise control is active, the cruise control interface unit (C1959) provides a feed to the EAT ECU (C0932) on a WU wire. When the EAT ECU receives this feed, it enters its cruise control mode. For more information on EAT operation, refer to the Electronic Automatic Transmission (EAT) – 01MY section of this manual. + ELECTRONIC AUTOMATIC TRANSMISSION (EAT) – 01MY.

Instrument Pack

When cruise control is operational, the cruise control interface unit (C1959) sends a 'cruise active' message to the instrument pack (C0230) via the CAN-BUS on YN (low) and YB (high) wires. This message is used to illuminate the cruise control lamp housed within the instrument pack.

CRUISE CONTROL – TD4 (02MY) & KV6 (NORTH AMERICA)

DESCRIPTION General

Cruise control is switched on by pressing the cruise control master switch mounted on the centre console. The 'Set +' and 'Res' switches mounted on the steering wheel allow the driver to either set the vehicle speed as required or resume the last cruising speed set.

The cruise control system uses mechanical, electrical and vacuum operated devices to maintain vehicle speed at a setting selected by the driver. As vehicle speed changes due to changes in road gradients, so the cruise control ECU operates the cruise control pump, continually moving the cruise control actuator to maintain the set vehicle speed.

Should the driver wish to increase the speed of the vehicle, the 'Set +' switch should be pressed and held. The vehicle will accelerate until the switch is released. As the 'Set +' switch is released, the cruise control ECU will store the new cruise speed in its memory.

With cruise control switched on, it is possible to press the accelerator pedal and accelerate through the memorised set speed. When the accelerator is released, the cruise control ECU will automatically return the vehicle to its set speed. Note: The cruise control system will only operate between speeds of 22 mph (35 kph) and 125 mph (201 kph).

Cruise control operation can be suspended by one of the following ways: By pressing the 'Res' switch. By pressing the brake pedal. The gearbox is placed in park, neutral, or reverse. Hill Descent Control (HDC) is active. Engine rev's are too high.

Under all these conditions, the cruise control set speed will be memorised. Cruise control operation can be resumed by pressing the 'Res' switch.

Cruise control operation can be cancelled in one of two ways: By pressing the cruise control master switch located on the centre console. By switching the ignition off.

In both these cases, the cruise control set speed will be lost.

Warning: Do not switch off the vehicle ignition unless the vehicle is stationary and the handbrake is applied.

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 (C0604) on an NG 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 or Engine Management System – Siemens (NAS) 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 (C0501) 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 System Description and Operation Workshop manual.