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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1393 (Windows & Glass - Glass, Frames & Mechanisms) >> Diagnostic Tests >> Glass, Frames and Mechanisms >> Pinpoint Tests >> Pinpoint Test N: The Defrost System Will Not Shut Off Automatically - Fusion, Milan >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

The heated backlight relay, which is integral to the smart junction box (SJB), receives power from circuit SBB06 (BN/RD). When the rear window defrost switch is pressed on the HVAC module - electronic automatic temperature control (EATC) or HVAC module - electronic manual temperature control (EMTC), a message is sent to the SJB through circuit CH122 (WH/OG). Once the SJB receives the message to turn on the rear window defrost, the SJB grounds the heated backlight relay coil, which sends power to the rear window defrost grid through circuit CLS38 (VT/WH).

This pinpoint test is intended to diagnose the following:

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