J: Rear Window Defroster Will Not Auto. Shut Off - Crn VIC

Pinpoint Test J - Rear Window Defroster Will Not Shut Off Automatically - Crown Victoria, Grand Marquis

J1 - Test Mirror Circuit

- Remove fuse 17 (10A).
- Test on output side of fuse for voltage.

Is voltage reading B+?

YES SERVICE circuit 59 (DG/P) for short to B+. RETEST system.
NO GO to J2.

J2 - Check Fuse 17

- Test for voltage on input side of fuse 17 (10A).

Is voltage reading B+?

YES GO to J3.
NO SERVICE radio isolator module.

J3 - Test Lighting Control Module

- Disconnect connector C3 from lighting control module.
- Test for voltage on input side of fuse 17 (10A).

Is voltage reading B+?

YES GO to J4.
NO REPLACE lighting control module. RETEST system.

J4 - Test Relay Input

- Remove heated back window relay.
- Test for voltage on input side of fuse 17 (10A).

Is voltage reading B+?

YES GO to J6.
NO GO to J5.

J5 - Test Relay Ground

- Test for continuity between circuit 688 (GY/LB) at the heated back window relay and ground.

Is there continuity?

YES SERVICE circuit 688 (GY/LB) for short to ground. RETEST system.
NO REPLACE heated back window relay. RETEST system.

J6 - Test Antenna Isolator Module

- Disconnect connector from antenna isolator module
- Test for voltage on input side of fuse 17 (10A).

Is voltage reading B+?

YES SERVICE circuit 186 (BR/LB) for short to B+. RETEST system.
NO SERVICE radio isolator module. RETEST system.