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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Suzuki XL7. However, it is still accessible from the selected car via links, so may be relevant.

Fog Lamp Relay, BCM, and Underhood Fuseblock Circuit Testing 

  1. Ignition OFF, disconnect the fog lamp relay, underhood fuseblock terminal C2 pin 19.
  2. Ignition ON, verify the fog lamps are deactivated.
    • If the fog lamps are still activated, repair the relay switch control circuit for a short to voltage.
  3. Connect a 10-amp fused jumper wire between the underhood fuseblock B+ circuit and the fog lamp signal circuit, BCM terminal C3 pin 21. Verify the fog lamps are activated.
    • If the fog lamps are not activated, test the fog lamp signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the underhood fuse block.
  4. Connect a test lamp between the relay coil control circuit terminal C4 pin 11 and the underhood fuseblock B+ circuit.
  5. Turn the fog lamp relay ON and OFF by turning ON and OFF the fog lamp switch. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp remains ON all the time, test for a short to ground on the relay coil control circuit. If the circuit tests normal, replace the BCM.
    • If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the relay coil control circuit. If the circuit tests normal, replace the BCM.
  6. If all circuits test normal, test or replace the underhood fuseblock.
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