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Home >> Hummer >> 2008 >> H3 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Lighting Systems) >> Diagnostic Information and Procedures >> Courtesy Lamps Malfunction >> Circuit/System Testing

Circuit/System Testing

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Courtesy Lamp Switch Circuit Test

  1. Ignition OFF, disconnect the headlamp 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 switch signal circuit 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 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 switch.

Driver Door Jamb Switch Circuit Test

  1. Ignition OFF, disconnect the harness connector at the driver door jamb switch.
  2. Test for less than 5 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 scan tool driver 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 scan tool driver door ajar switch parameter is door ajar.
    • 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 driver door ajar switch.

Passenger Door Jamb Switch Circuit Test

  1. Ignition OFF, disconnect the harness connector at the affected door jamb switch.
  2. Test for less than 5 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 scan tool passenger 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 scan tool passenger door ajar switch parameter is door ajar.
    • 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 affected door jamb switch.

Courtesy Lamp Control Circuit Test

  1. Ignition OFF, disconnect the harness connector at the affected courtesy or dome lamp bulb.
  2. Ignition ON, verify that a test lamp illuminates between the lamp supply circuit terminal A and ground.
    • If the test lamp does not illuminate, test the courtesy lamp supply 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.
  4. Operate the courtesy lamp switch ON and OFF. The test lamp should turn ON and OFF when changing between the commanded states.
    • 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.
  5. If all circuits test normal, test or replace the affected bulb.
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