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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Mirror System) >> Diagnostic Information and Procedures >> DTC B1640 or B1645 >> Circuit/System Description

Circuit/System Description

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The driver door switch (DDS) and passenger door switch (PDS) supply voltage to the outside rearview mirror heater elements upon receipt of a GMLAN message from the body control module (BCM) indicating that the rear defrost system is active. The door switches monitor the heater element control circuits whenever the ignition is ON.

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