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 MANUALSSAAB20109-5REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTDRIVERS ASSISTANCE SYSTEMS - ADASTRAFFIC SAFETY SYSTEMFAULT DIAGNOSIS, SYMPTOMSLANE DEPARTURE WARNING SYSTEM MALFUNCTIONCIRCUIT/SYSTEM TESTINGLANE DEPARTURE WARNING SWITCH LED CIRCUIT MALFUNCTION
2010 Saab 9-5
Lane Departure Warning Switch LED Circuit Malfunction
2010 Saab 9-5SECTION Lane Departure Warning Switch LED Circuit Malfunction
- Ignition OFF, disconnect the harness connector at the K74 Vehicle Direction Camera Control Module.
- Ignition ON, observe the lane departure warning switch indicator. The indicator should be OFF.
- If the indicator remains illuminated, test to see if there is a short circuit to ground in control circuit terminal 4. If the circuit tests normal, replace the S48E multifunction switch - center console.
- Ignition OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console.
- Ignition ON, test for greater than 11 V between the ignition circuit terminal 3 at the S48E Multifunction Switch - Center Console harness connector and ground.
- If less than the specified value, test the ignition circuit for a short to ground or an open/high resistance.
- Ignition OFF, connect the harness connector at the S48E Multifunction Switch - Center Console.
- Install a 3 A fused jumper wire between the control circuit terminal 4 and ground. The indicator should be ON.
- If the indicator is always OFF, test the control circuit terminal 4 for a short to battery or an open/high resistance. If the circuit tests normal, replace the S48E Multifunction Switch - Center Console.
- If all circuits test normal, replace the K74 Vehicle Direction Camera Control Module.
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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.