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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1224 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESFRONT FOG LAMPS MALFUNCTIONCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Circuit/System Testing

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.

Fog Lamps Always On

  1. Ignition OFF, disconnect the FRT FOG relay.
  2. Ignition ON, verify that the fog lamps are not illuminated.
    • If the fog lamps are illuminated, test the relay controlled output circuit for a short to voltage.
    • If all circuits test normal, replace the FRT FOG relay.

Fog Lamps Inoperative From BCM

  1. Ignition OFF, disconnect the FRT FOG relay.
  2. Ignition ON, verify that a test lamp illuminates between the relay switch B+ circuit and ground.
    • If the test lamp does not illuminate, replace the underhood fuse block.
  3. Test the relay controlled output circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the FRT FOG relay.

Fog Lamps Inoperative From Switch

  1. Verify the scan tool Front Fog Lamp Switch parameter is Inactive.
    • If not the specified value, test the fog lamp switch signal circuit for a short to ground. If the circuit tests normal, replace the fog lamp switch.
  2. Disconnect the harness connector at the fog lamp switch.
  3. Verify that a test lamp illuminates between the ground circuit terminal A and B+.
    • If the test lamp does not illuminate, test the ground circuit terminal A for a short to voltage or an open/high resistance.
  4. Install a 3A fused jumper wire between the signal circuit terminal C and ground. Verify the scan tool Front Fog Lamp Switch parameter is Active.
    • If not the specified value, test the signal circuit terminal C for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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