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.
Telephone System Through May 2009
The telephone system consists of the cell phone pre-installation.
The Telephone Transceiver -R36- is integrated in the MMI infotainment system via the MOST bus. It has also a Bluetooth interface.
The Telephone Baseplate -R126- is installed in the center armrest. Operation is performed via Multimedia Control Head -E380- or via Cellular Telephone -R54-.
Microphones for the microphone unit (in front roof module) -W1- are installed in the front interior lamp -R164-. One microphone is connected (Telephone Microphone -R38-) with the Telephone Transceiver -R36-.
Fault finding is performed via "Guided Fault Finding" Refer to Vehicle Diagnostic Tester.
Repairing antenna wires. Refer to ANTENNA WIRES, REPAIRING .
Notes on Bluetooth technology
Bluetooth technology is a standardized radio wave data transmission system.
An additional transmitter/receiver unit is installed in the Telephone Transceiver -R36-. A separate "Bluetooth Antenna" connects the Telephone Transceiver -R36- and Telephone Baseplate -R126- so that all Cellular Telephones -R54- can be used cordless via Bluetooth technology.
The range of the radio wave connection is approximately 10 meters.
Additional information, refer to self study 286, New data bus systems - LIN, MOST Bluetooth..
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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.