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 PROCEDURESHEADLAMP LOW OR HIGH BEAMS 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.
Multifunction/Headlamp Switch Circuit Testing
- Ignition OFF, disconnect the harness connector at the headlamp switch terminal C1 pins 4 and 2.
- Test for less than 1 Ω of resistance between the ground circuit and ground, terminal C1 pin 1.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Verify the headlamps are OFF.
- If the headlamps are not OFF, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
- Install a 3-amp fused jumper wire between the signal circuit and ground. Verify the headlamps are ON.
- If the headlamps are not ON, test the signal circuit of the headlamp switch for a short to voltage or an open/high resistance. If circuit tests normal, replace the BCM.
- If all circuits test normal, test or replace the headlamp switch which is part of the turn signal multifunction switch.
Headlamp Relay Circuit Testing
- Ignition OFF, disconnect the high and low beam headlamp relay terminals, C2 pin 18, C2 pin 8, C3 pin 9 and, C3 pin 21.
- Ignition ON, verify the headlamps are deactivated.
- If the headlamps are still activated, repair the relay switch control circuit for a short to ground, terminals C3 pin 9 and, 21.
- Connect a test lamp between the relay coil control circuit, terminals C2 pins 8 and 18 and the underhood fuseblock B+ supply circuit.
- Turn the headlamps ON by the headlamp switch. The test lamp should turn ON.
- 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 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.