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.
Circuit/System Verification
- Ignition ON.
- Verify the scan tool Immobilizer Allows Engine to Start parameter is Valid when using each vehicle key.
- If Authentication Error NOTE:
Perform the appropriate key procedures for this vehicle. Not all vehicle models and years are the same.
Replace the keys.
- Go to next step: If Valid
- If Authentication Error
- Verify DTC B3935 does not set while operating the vehicle under the conditions for running the DTC.
- If the DTC is set
Replace the K9 Body Control Module.
- Go to next step: If the DTC is not set
- If the DTC is set
- All OK.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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