Jaguar XJ (X350). Manual — part 1170

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Speed control sensor - vehicles with adaptive speed control

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Automatic speed limiter switch - vehicles with automatic speed limiter

System operation

The speed control system is inoperative below 32 kph (20 mile/h) and above 250 kph (155 mile/h).

The speed control system is designed to maintain a selected vehicle speed between 32 kph (20

mile/h) and 180 kph (112 mile/h).

Any of the switches operated by the brake will interrupt the speed control operation by switching the

signal to the engine control module (ECM). This will allow the system to go into STANDBY mode.

Pressing the RESUME switch with the vehicle travelling above 32 kph (20 mile/h) while the system is

in STANDBY mode will allow the vehicle to accelerate until the last set speed is resumed.

Speed Control Steering Wheel Switches

RESUME Switch

When the RESUME switch is operated with the vehicle travelling above 32 kph (20 mile/h) with the

system in STANDBY mode, the vehicle is allowed to accelerate until the last set speed is resumed.

The RESUME switch will not function if the ignition switch has been cycled or if the vehicle speed is

below 32 kph (20 mile/h).

CANCEL Switch

When the CANCEL switch is operated with the vehicle travelling above 32 kph (20 mile/h) the system

will enter STANDBY mode.

SET Switch

When the SET +/- switch is operated with the vehicle travelling above 32 kph (20 mile/h) the system

allows the vehicle speed to be maintained to ± 1.62 kph (1 mile/h). Pressing the SET +/- switch will

increase or decrease the vehicle speed respectively until the switch is released. If the respective

switch is pressed momentarily, the speed will accelerate or decelerate in 1.62 kph (1 mile/h)

increments.

Brake Pedal Position (BPP) Switch

If the brake pedal is operated while the speed control system is active, the ECM receives a signal

from the BPP switch. This will cancel vehicle speed control and allow the throttle blade to return to

the position as demanded by the accelerator pedal.

Speed Control Deactivation Switch (brake).

If the brake pedal is activated while the speed control system is active, the ECM receives a signal

from the speed control deactivation switch. This will cancel speed control and allow the throttle

blade to return to the position as demanded by the accelerator pedal.

Adaptive Speed Control

On vehicles for certain markets, an adaptive speed control system is installed as an option. In

addition to the normal vehicle speed control functions, this system enables a preset distance to be

maintained behind a moving vehicle immediately ahead, without driver intervention.

Automatic Switch Off - Vehicles with Adaptive Speed Control

The adaptive speed control will disengage, but not clear the memory when:

the CANCEL button is operated.

the brake pedal is applied.

the vehicle speed falls below 26 kph (16 mile/h).

neutral, park or reverse gear positions are selected.

traction control is activated.

cruise override activated for more than five minutes.

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The adaptive speed control will disengage, and clear the memory when:

the ignition switch is set to position '0'.

a fault occurs in the adaptive speed control system.

Forward Alert Switch - Vehicles with Adaptive Speed Control

Forward Alert

The forward alert system is switched on and off by the forward alert switch, which is incorporated

into the message center switch. The forward alert system additionally provides warnings while the

adaptive speed control is not activated.

Speed Control Module - Vehicles with Adaptive Speed Control

The speed control module provides system control functions.

Speed Control Sensor - Vehicles with Adaptive Speed Control

The speed control sensor incorporates the forward looking radar sensor.

Adaptive Speed Control Failure

If a fault occurs during any adaptive speed control operation, the adaptive speed control system will

deactivate and will remain in this state until the fault is rectified. The 'CRUISE NOT AVAILABLE'

message will be displayed on the message center on 'demand' by trying to operate the steering

wheel control switches. This on 'demand' strategy is intended to show that adaptive speed control is

not available and another fault may exist. For example: If an anti-lock brake system or traction

control error message is displayed this would imply that the brake system may be effecting or

inhibiting the adaptive speed control. If the message center displays 'CRUISE NOT AVAILABLE'

permanently or no message is displayed, this may imply that the vehicle has an ECM fault.

Automatic Speed Limiter

The automatic speed limiter enables the vehicle speed to be limited. The vehicle speed is selected

from the message center, the ECM limits the throttle response and stops the vehicle from

accelerating over the preset speed limit.

Note: Automatic speed limiter is restricted to controlling the throttle only.

Note: Automatic speed limiter is unable to request automatic braking.

Automatic Speed Limiter Switch

Vehicles fitted with an automatic speed limiter are fitted with an automatic speed limiter master

switch. This switch is intended for use as an automatic speed limiter ON/OFF switch, it also functions

as a selection switch between adaptive/normal speed control and the automatic speed limiter

options.

If the automatic speed limiter is selected the adaptive/normal speed control is cancelled.

If the automatic speed limiter is NOT selected the adaptive/normal speed control can be used.

The automatic speed limiter switch will be a standard fit to all XJ variations.

The automatic speed limiter switch is illuminated when switched on.

Cruise switches

Existing speed control; switch pack is used for automatic speed limiter.

Set +/- switch.

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