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
The steering wheel is equipped with the following components:
- Fanfare-horn button
- Priming caps for the driver's airbag
- Driver's airbag
- Buttons for radio operation
- Buttons for telephone operation
- Cruise control system buttons
- Steering wheel electronics
- Steering wheel heating
- Vibration actuator.
The fanfare-horn button is connected directly to the steering column switch cluster. The junction box electronics requests the button status of the fanfare-horn button in cycles.
The steering column switch cluster evaluates the button status and sends this across the FlexRay to the junction box electronics.
The buttons for the radio, telephone and cruise control system are connected via the LIN bus. The applies to the steering wheel electronics. The central control unit for this equipment attached to the LIN bus is the steering column switch cluster.
The right-hand button block contains the master function for the left-hand button block and has an electronic evaluation unit. The electronic evaluation unit picks up the button status of the individual buttons. The electronic evaluation unit implements the button status on the LIN bus. The steering column switch cluster requests the button status in cycles and thus finds out whether a button was operated or not. The steering column switch cluster transmits the button status across the FlexRay. In this way, the information reaches the other control units in the vehicle network.
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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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