Pinpoint Test AC: ADCM POWER SUPPLY OR GROUND FAULT

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Jaguar XKR, 2006 Jaguar XK8, 2005 Jaguar XKR, 2005 Jaguar XK8, and 2004 Jaguar XKR. However, it is still accessible from the selected car via links, so may be relevant.

CHECK THE PERMANENT SUPPLY TO THE ADCM
Disconnect the ADCM electrical connector, BT69.

Measure the voltage between BT69, pin 27 (NW) and GROUND.

Is the voltage less than 10 volts?

YES: REPAIR the circuit between the ADCM and battery. This circuit includes the rear power distribution box, (fuse 02) and the high power protection module. For additional information, refer to the wiring diagrams. Test the system for normal operation.

NO: Go to step 2.
CHECK THE IGNITION SWITCHED SUPPLY TO THE ADCM
Turn the ignition switch to the ON position.

Measure the voltage between BT69, pin 11 (WR) and GROUND.

Is the voltage less than 10 volts?

YES: REPAIR the circuit between the ADCM and battery. This circuit includes the rear power distribution box, (fuse 04) the ignition positive relay and the high power protection module. For additional information, refer to the wiring diagrams. Test the system for normal operation.

NO: Go to step 3.
CHECK THE PERMANENT GROUND TO THE ADCM
Turn the ignition switch to the OFF position.

Measure the resistance between BT69, pin 18 (B) and GROUND.

Is the resistance greater than 5 ohms?

YES: REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. Test the system for normal operation.

NO: Check for DTCs indicating a faulty circuit. Contact dealer technical support for advice on possible ADCM failure