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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 991 (Door Lock Systems & Door Handles) >> Diagnostic Information and Procedures >> Power Door Locks Inoperative - Rear >> Circuit/System Verification

Circuit/System Verification

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  1. Verify that a test lamp connected to ground illuminates on the supply side of the unlock fuses 1 and 2 when an unlock switch is activated.
    • If the test lamp does not illuminate at either fuse perform the Rear Door Lock Relay Control Circuit Test.
    • If the test lamp does not illuminate at one fuse only perform the appropriate Actuator Circuit Test.
  2. Verify that a test lamp connected to ground illuminates on the supply side of the lock fuses 1 and 2 when a lock switch is activated.
    • If the test lamp does not illuminate at either fuse perform the Rear Door Lock Relay Control Circuit Test.
    • If the test lamp does not illuminate at one fuse only perform the appropriate Actuator Circuit Test.
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