Principles Of Operation

The pedestrian protection system is operational when the vehicle is travelling at speeds between approximately 25 kph and 50 kph (16 and 32 mph). A vehicle speed signal is received by the Restraints Control Module (RCM) over the High Speed (HS) Controller Area Network (CAN) powertrain systems bus.

The system is able to determine if contact is made with a pedestrian or another object, such as a traffic cone, using signals from the pedestrian impact sensors. When the system determines contact is made with a pedestrian, it fires the hood deployment control to lift the rear of the hood approximately 130 mm (5.2 in.) within 35 ms of the 'fire' signal.

When an impact condition is registered, the RCM outputs an impact signal on the HS CAN bus. This signal is used by the Central Junction Box (CJB) to initiate the hazard warning lamps. If this occurs, the hazard warning lamp switch is disabled for the remainder of the current ignition cycle.

If the RCM detects a fault with the system, it outputs a message on the HS CAN powertrain systems bus to the Instrument Cluster (IC) message center. On receipt of this, the message center will display the message Check Pedestrian System.

When the vehicle is delivered from the factory the pedestrian protection system is in a safe 'plant' mode. Normal operating mode must be activated using Jaguar approved diagnostic equipment during the Pre-Delivery Inspection (PDI) prior to delivery to the customer.

Failure Mode Detection 

In service, if any fault is detected, the message center displays the warning Check Pedestrian System.

The hood deployment controls is non-serviceable component. If they are replaced their bar code labels must be read and recorded in the service database against the Vehicle Identification Number (VIN) for security purposes.

After deployment of the pedestrian protection system, the vehicle must be stopped as soon as it is safe to do so. The hazard warning lamps will be activated and can only be switched off by pressing the engine START/STOP switch to turn the engine off and on again. A warning message 'Check Pedestrian System' will appear in the message center and the vehicle should be transported to the nearest dealer/authorised repairer. The vehicle must not be driven when the hood has been deployed.