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 Testing
It is recommended that Component Testing is performed before Circuit Testing when diagnosing steering wheel controls.
- Ignition OFF, disconnect the harness connector at the audio steering wheel control switches.
- Ignition ON, test for 12 volts between the voltage supply circuit and ground at the right switch harness connector.
- If less than 10 volts, test the voltage supply circuit for a short to ground or an open/high resistance. If circuit tests normal, replace the BCM.
- Install a 3-amp fused jumper wire at the right switch supply voltage circuit. Toggle the jumper wire to the signal circuits at the left and the right harness connectors. Verify DTC B2815 sets.
- If DTC B2815 does not set, test the signal circuits for a short to ground or an open/high resistance. If circuits test normal, replace the BCM.
- Remove the 3-amp fused jumper wire.
- Ignition OFF, test the jumper wire for less than 1.0 ohm of resistance between the left and right switch connectors.
- If greater than 1.0 ohm, test the jumper wire circuit for an open/high resistance.
- If circuit tests normal, test or replace the switch.
Use the Manual With the Right Hardware
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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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