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 10.31.2008
The telephone system consists of the cell phone pre-installation.
The telephone transceiver -R36- is integrated in the MMI Infotainment via the CAN/MOST-BUS. It also has a Bluetooth Antenna -R152-.
The Telephone base plate -R126- is installed in the center console. The operation is performed via the Multimedia Control Head -E380- (MOST), the Radio (CAN) or via the Cellular Telephone -R54-.
The microphones for the microphone unit in front roof module -R164- are integrated in the front interior lamp -W1-. One microphone is connected (Telephone Microphone -R38-) with the Telephone Transceiver -R36-.
Fault finding is performed via "Guided Fault Finding" using the Vehicle Diagnostic Tester.
Repairing antenna wires, refer to General Information .
Notes on Bluetooth technology
A standardized radio connection system is used to transmit data between Telephone Transceiver and Telephone Handset -R37- /Cellular Telephone -R54- - Bluetooth technology.
An additional transmitter/receiver unit is installed in the Telephone Transceiver. A separate Bluetooth Antenna -R152- connects the Telephone Transceiver and Telephone Base plate/Cellular Telephone -R54- so that the Telephone Handset -R37- /Cellular Telephone -R54- can be operated cordless.
The range of the radio wave connection is approximately 10 meters (33 ft.).
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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.