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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 317 (Fixed And MOVEABLE Windows) >> Diagnostic Information and Procedures >> DTC B320A >> Circuit/System Description

Circuit/System Description

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The front door power window motors communicate with the driver door module (DDM) and passenger door module (PDM) via serial data. The motors contain a logic module which must be normalized or programmed any time the window motor is serviced to provide proper operation and communication between door modules and window motors.