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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 450 (Mirror System) >> Diagnostic Information and Procedures >> DTC B1722 >> Circuit/System Description

Circuit/System Description

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The Driver Door Module (DDM) and Passenger Door Module (PDM) control the power folding or power extending functions of the outside rearview mirrors. The folding mirror motors are controlled by using bi-directional motor controls through the folding mirror motor retract control circuit and the folding mirror motor extend control circuit.