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.
Control Unit
The Car Access System is located above the steering column on the right-hand side.
For the Comfort Access function, the Car Access System controls the transmitting antennas for the vehicle exterior and interior.
The outside door handle electronics are read by the Car Access System.
| Index | Explanation |
|---|---|
| 1 | Car Access System 4 with Comfort Access |
| 2 | Junction box electronics |
| 3 | Remote control receiver in the diversity module |
| 4 | Footwell module |
| 5 | Central gateway module |
| 6 | Outside door handle electronics |
| 7 | Antennas for Comfort Access |
| 8 | Central locking components in the trunk |
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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