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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1780 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> DTC B3130 or B3135 >> Circuit/System Description

Circuit/System Description

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The LOCK/UNLOCK relay is controlled by the body control module (BCM) by providing voltage to one side of the relay or providing a ground to the other side of the relay. During lock or unlock operation, battery voltage will be supplied to the lock actuators through the energized side of the relay and grounded through the de-energized side of the relay.

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