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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1825 (Windows And Glass - F-150 & Mark LT) >> Diagnostic Tests >> Glass, Frames and Mechanisms >> Pinpoint Tests >> Pinpoint Test G: The Defrost System is Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Under normal operation, the heated rear window relay receives power from circuit 1113 (YE/LG) and central junction box (CJB) fuse 10 (10A). When the rear window defrost switch is depressed on the HVAC module, a request signal is sent to the instrument cluster (IC) through circuit 1010 (DB/OG). Once the IC receives the signal to turn on the rear window defrost, the IC grounds circuit 1009 (OG/YE) to activate the heated rear window relay. Power is then sent to the rear window defrost grid through circuit 186 (BN/LB) from the heated rear window relay. The rear window defrost grid then receives ground through circuit 57 (BK) to chassis ground.

This pinpoint test is intended to diagnose the following:

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