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Home >> Hummer >> 2008 >> H3 Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 264 (Lighting Systems) >> Diagnostic Information and Procedures >> Courtesy Lamps Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 GMC Canyon and 2009 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy Lamp Switch Malfunction

  1. Ignition OFF, disconnect the headlamp and panel dimmer switch connector.
  2. Test for less than 5 ohms between the low reference circuit terminal 3 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance.
  3. Ignition ON, verify that the scan tool courtesy lamp switch parameter displays Inactive.
    • If the parameter displays Active test the courtesy lamp signal circuit terminal 11 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the courtesy lamp signal circuit terminal 11 and the ground circuit terminal 3. Verify the scan tool courtesy lamp switch parameter displays Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If the circuits test normal, test or replace the headlamp and panel dimmer switch.

Door Jamb Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the driver door jamb switch.
  2. Ignition OFF, Door Closed, test for less than 5.0 ohms between the ground circuit terminal 2 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the appropriate door ajar switch parameter is Door Closed.
    • If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 2. Verify the Door Ajar Switch parameter is Door Ajar with a scan tool..
    • If not the specified value, 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 circuits test normal, test or replace the appropriate door ajar switch.

Courtesy Lamp Malfunction

  1. Ignition OFF, disconnect the harness connector at the inoperative courtesy or dome lamp bulb.
  2. Ignition ON, verify that a test lamp illuminates between the courtesy lamp supply circuit terminal A and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the BCM.
  3. Connect a test lamp between the control circuit terminal B and courtesy lamp supply circuit terminal A. Command the Courtesy Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, test or replace the inoperative lamp.
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