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Home >> Ford >> 2013 >> Edge SEL, 2.0L Eng VIN 9 >> Repair and Diagnosis >> External Pages >> Different car >> Section 287 (Windows And Glass - Glass, Frames And Mechanisms) >> Diagnosis And Testing >> Glass, Frames and Mechanisms >> Pinpoint Tests >> Pinpoint Test J: The Defrost System is Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

When the engine is running and the rear window defrost switch (integral to the Front Controls Interface Module (FCIM)) is pressed, the FCIM  sends the defrost request message to the Instrument Panel Cluster (IPC) over the Infotainment Controller Area Network (I-CAN). The IPC then sends the defrost request message to the Body Control Module (BCM) over the High Speed Controller Area Network (HS-CAN). The BCM  then sends the defrost request message to the HVAC module through the Medium Speed Controller Area Network (MS-CAN). When the HVAC module receives the rear window defrost request message, it activates the rear window defrost relay by grounding the relay coil. When the rear window defrost relay is activated, voltage is supplied from the rear window defrost relay to the rear window defrost grid.

This pinpoint test is intended to diagnose the following: 

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