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.
Steering Wheel Controls Description and Operation
The steering wheel control switches duplicate the function of the primary controls of the associated component through a network of momentary contact switches. The body control module (BCM) supplies voltage to the audio steering wheel control momentary contact switches and monitors the return signal. Each switch is associated to a set resistance value. When a switch is pressed a specific voltage drops accross the resistor unique to the switch. The BCM identifies the selection and sends a serial data message to the component controlled by the switch, activating the switch selection
This section is intended to diagnosis the circuits between the BCM and the steering wheel control switches. If the primary control for the device is inoperative, refer to the appropriate section for the component.
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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.