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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 2016 (Windows And Glass - Glass, Frames And Mechanisms) >> Diagnosis And Testing >> Glass, Frames and Mechanisms >> Pinpoint Tests >> Pinpoint Test K: The Defrost System Will Not Shut Off Automatically >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

The rear window defrost relay, located in the Battery Junction Box (BJB), receives power from circuit CBP45 (YE). When the rear window defrost switch (integral to the HVAC module) is pressed, the HVAC module grounds circuit CH122 (WH/OG) to activate the rear window defrost relay. When the rear window defrost relay is activated, power is sent from the rear window defrost relay to the rear window defrost grid through circuit CRD06 (BN/YE). The rear window defrost grid is grounded through circuit GD149 (BK/GY).

This pinpoint test is intended to diagnose the following: 

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