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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1340 (Windows And Glass) >> Diagnostic Tests >> Glass, Frames and Mechanisms >> Pinpoint Tests >> Pinpoint Test F: The Defrost System is Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

When the engine is running and the defrost switch is pressed, the HVAC activates the rear window defrost relay by grounding the relay coil through circuit CH122 (WH/OG). When the defrost relay is activated, power is supplied from the relay to the rear window defrost grid through circuit CRD06 (BN/YE). Ground is supplied to the rear window defrost grid through circuit GD147 (BK/VT).

This pinpoint test is intended to diagnose the following:

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