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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1920 (Door Lock System And Door Handles) >> Diagnostic Information and Procedures >> Power Door Lock Key Cylinder Switches Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the driver door latch assembly.
  2. Test for less than 1 ohm between the ground circuit terminal 8 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Test for greater than 9 volts between the signal circuit terminals listed below and ground:
    • Unlock signal circuit terminal 9
    • Lock signal circuit terminal 4
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM
  4. Connect a 3A fused jumper wire between the signal circuit terminal 4 and ground. Verify the doors perform the LOCK function.
    • If the door latches do not LOCK, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM
  5. Connect a 3A fused jumper wire between the signal circuit terminal 9 and ground. Verify the doors perform the UNLOCK function
    • If the door latches do not UNLOCK, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM
  6. If all circuits tests normal, test or replace the driver door latch assembly.
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