Pinpoint Test Z: MAJOR IC 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 MAJOR IC
Disconnect the IC electrical connector, FC25.

Measure the voltage between FC25, pin 15 (R) and GROUND.

Is the voltage less than 10 volts?

YES: REPAIR the circuit between the IC and battery. This circuit includes the driver side fuse box, (fuse 04) 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 MAJOR IC
Turn the ignition switch to the ON position.

Measure the voltage between FC25, pin 01 (WG) and GROUND.

Is the voltage less than 10 volts?

YES: REPAIR the circuit between the IC and battery. This circuit includes the driver side fuse box, (fuse 14) 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 MAJOR IC
Measure the resistance between FC25, pin 04 (BK) and GROUND.

Measure the resistance between FC25, pin 16 (B) and GROUND.

Is either 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 major IC failure