Conditions for Clearing the DTC

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

When the short circuit is no longer present, the DDM/PDM will clear the current DTC and store the DTC as a history DTC. The history DTC will clear after 50 fault free ignition cycles or in response to a scan tool command.

DTC B1640 or B1645

Step	Action	Yes	No
Schematic Reference: Outside Rearview Mirror Schematics Connector End View Reference: Mirror Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Turn ON the ignition, with the engine OFF. Activate the rear defroster switch. Does DTC B1640 or B1645 set as current in the driver door module (DDM) or passenger door module (PDM)?	Go to Step 3	Go to Testing for Intermittent Conditions and Poor Connections
3	Turn OFF the ignition. Disconnect the appropriate heated mirror. Turn ON the ignition, with the engine OFF. Activate the rear defroster switch. Does DTC B1640 or B1645 set as current in the DDM or PDM?	Go to Step 5	Go to Step 4
4	Inspect for poor connections at the heated mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 8	Go to Step 6
5	Inspect for poor connections at the harness connector of the appropriate door module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 8	Go to Step 7
6	Replace the heated mirror. Refer to Mirror Replacement . Did you complete the replacement?	Go to Step 8	-
7	Replace the appropriate door module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	Go to Step 8	-
8	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC. Does the DTC reset?	Go to Step 2	System OK