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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 >> Cargo Lamps Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Isuzu i-370, 2008 Isuzu i-290, 2008 GMC Canyon, and 2008 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.

Cargo 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 cargo 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 10 and the ground circuit terminal 3. Verify the scan tool cargo 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.

Cargo Lamp Control Circuit Test

  1. Ignition OFF, disconnect the harness connector at the affected cargo lamp bulb.
  2. Test for less than 5 ohms between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal A and the ground circuit terminal B.
  4. Turn the dome lamp switch on and operate the cargo 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 voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the affected bulb.
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