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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 872 (Door Lock Systems & Door Handles) >> Diagnostic Information & Procedures >> Power Door Locks Inoperative - Front (w/o YE9) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that the BCM door lock switch parameters display Idle, Lock, and Unlock while operating the driver and passenger door lock switches to lock and unlock.
    • If either of the scan tool parameters do not match the actual switch positions perform the Door Lock Switch 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 one or both fuses perform the Door Lock Relay Control Circuit Test.
    • If the test lamp illuminates at both fuses perform the Door Lock Actuator Circuit Test.
  3. Verify that a test lamp connected to ground illuminates on the supply side of the unlock DRV fuse when an unlock switch is activated.
    • If the test lamp does not illuminate at any of the fuses perform the Driver Door Unlock Relay Control Circuit Test.
    • If the test lamp illuminates perform the Door Lock Actuator Circuit Test.
  4. Verify that a test lamp connected to ground illuminates on the supply side of the unlock fuses 1 and 2 when a unlock switch is activated.
    • If the test lamp does not illuminate at one or both fuses perform the Door Lock Relay Control Circuit Test.
    • If the test lamp illuminates at both fuses perform the Door Lock Actuator Circuit Test.
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