Pinpoint Test I: DTC P1774; CHECK THE LINEAR SWITCH MODULE SUPPLIES AND GROUNDS

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 IGNITION SWITCHED POWER SUPPLY TO THE LINEAR SWITCH MODULE
Disconnect the linear switch module electrical connector, FC100.

Turn the ignition switch to the ON position.

Measure the voltage between FC100, pin 04 (WR) and GROUND.

Is the voltage less than 10 volts?

YES: REPAIR the circuit between the linear switch module and battery. This circuit includes the driver side fuse box, (fuse 16) 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 2.
CHECK THE PERMANENT GROUND TO THE LINEAR SWITCH MODULE
Measure the resistance between FC100, pin 11 (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: If the CAN tests are satisfactory, contact dealer technical support for advice on possible linear switch module failure.