Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUZUKI2013SX4 CROSSOVER, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 13 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESFOG LAMPS ALWAYS ONCIRCUIT/SYSTEM TESTING
2013 Suzuki SX4 Crossover, Automatic CVT Trans
Circuit/System Testing
2013 Suzuki SX4 Crossover, Automatic CVT TransSECTION 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
- Ignition OFF, disconnect the fog lamp relay, underhood fuseblock terminal C2 pin 19.
- 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.
- 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.
- Connect a test lamp between the relay coil control circuit terminal C4 pin 11 and the underhood fuseblock B+ circuit.
- 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.
- If all circuits test normal, test or replace the underhood fuseblock.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.