Principles Of Operation: Notes

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.