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.
Controls and Control Units: Controls
The controls for the seat functions are connected depending on the seat equipment. The controls are:
- Seat-adjustment switches
- Lumbar support switch
- Memory buttons
- Active-seat button
- Active seat ventilation button
- Massage function button.
Refer to the following table:
| Switch/button connection | Application |
|---|---|
| Direct | Seat adjustment motor is directly activated. |
| Resistance-coded | The seat module reads in the switch directly and effects the request triggered by the switch. |
| LIN-Bus | The seat module cyclically requests the status of the switch and effects the request triggered by the switch. |
| LIN bus > K-CAN2 | For example, the buttons in the armrests are connected to the footwell module or the junction box electronics. The control units evaluate the button status and send it via the K-CAN2. The signal is transferred from the central gateway module to the K-CAN. |
| Control unit > K-CAN | For example, the button status for the seat heating in the front seats is evaluated by the integrated automatic heating and air conditioning system and issued via the K-CAN. For example, the button status for the active seat ventilation in the rear seats is evaluated by the automatic rear-compartment air conditioning and issued via the K-CAN. |
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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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