Passive Restraint ECU Operational Check

The following procedure is designed to test the operation of the passive restraint ECU. Carry out each test in sequence in the order given below. If the system does not function in the manner described, refer to Jaguar Diagnostic System (JDS) to locate the fault.

1. Enter car (drivers seat). Close and lock both front doors. Operate inertia switch. Doors will remain locked.

2. Insert key into ignition. Seatbelt will remain at A post.

3. Turn ignition on (position 2). Seatbelt will remain at A post.

4. Turn ignition off (position 0). Reset inertia switch. Turn ignition on (position 2). Both seatbelts will deploy to B post. 'Seatbelt not fitted' warning will activate until drivers seatbelt latches in B post.

5. Open drivers door. Drivers seatbelt will retract to A post.

6. Open passenger door. Passenger seatbelt will retract to A post.

7. Close drivers door. Drivers seatbelt will deploy to B post.

8. Close passenger door. Passenger seatbelt will deploy to B post.

9. Turn ignition off (position 0). Both seatbelts will retract to A post.

10. Turn ignition on (position 2). Both seatbelts will deploy to B post. Lock doors. Operate inertia switch. Doors will unlock.

NOTE: It is necessary to detect the logic output from pin 1 LB86. Output should be logic 0.

11. Open drivers door. Drivers seatbelt will remain at B post.

12. Open passengers door. Driver's seatbelt will remain at B post.

13. Close both doors. Turn ignition off (position 0). Seatbelts will remain at B post.

14. Reset inertia switch. Seatbelts will retract to A post.

15. Turn ignition on (position 2). Detach drivers seatbelt from guide rail carrier. Seatbelt warning will activate.

16. Re-connect seatbelt to carrier. Seatbelt warning will de-activate.

17. End of test.