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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 >> DTC B2991 >> 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 harness connector at the appropriate passenger door latch.
  2. Test for less than 10 ohms between the ground circuit terminal listed below and ground.
    • Passenger door latch terminal 3
    • Right rear door latch terminal 3
    • Left rear door latch terminal 6
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the Door Ajar indicator is not illuminated.
    • If the indicator is illuminated, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM.
      • Passenger door latch signal circuit terminal 1
      • Right rear door latch signal circuit terminal 1
      • Left rear door latch signal circuit terminal 4
  4. Install a 3A fused jumper wire between the signal circuit terminal listed below and ground. Verify that the Door Ajar indicator is illuminated.
    • Passenger door latch signal circuit terminal 1
    • Right rear door latch signal circuit terminal 1
    • Left rear door latch signal circuit terminal 4
    • If the indicator is not illuminated, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuit tests normal, test or replace the passenger door latch.
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