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 PROCEDURESDTC B257ACIRCUIT/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.
- Headlamp switch to OFF, disconnect the BCM connector C2.
- Ignition to ON, connect a test lamp between the headlamp OFF switch circuit and the positive battery terminal.
Verify the test lamp illuminates.
- If the test lamp does not illuminate:
- Test for a short to voltage or an open in the headlamp OFF switch circuit.
- Test for an open in the headlamp ground circuit.
- If the circuit/connections test normal replace the headlamp switch.
- Headlamp switch to PARK, verify the test lamp is not illuminated.
- If the test lamp illuminates, test for a short to ground in the headlamp OFF switch circuit. If the circuit/connections test normal, replace the headlamp switch.
- Headlamp switch to PARK, connect a test lamp between the park lamp switch ON circuit and the positive battery terminal. Verify the test lamp illuminates.
- If the test lamp does not illuminate, test for a short to voltage or an open in the park lamp switch ON circuit.
If the circuit/connections test normal, replace the headlamp switch.
- If the test lamp does not illuminate, test for a short to voltage or an open in the park lamp switch ON circuit.
- Headlamp switch to OFF, verify the test lamp does not illuminate.
- If the test lamp does illuminate, test for a short to ground in the park lamp switch ON circuit. If the circuit/connections test normal, replace the headlamp switch.
- If all circuit/connections test normal, replace the BCM.
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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.