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 From June 2009
The telephone system consists of the following components:
- Cell phone preparation in the information electronics control module 1 -J794-
The cell phone preparation does not have a separate control module (telephone transceiver -R36-), but rather all the functions are integrated into the information electronics control module 1 -J794-. The telephone is operated either by the MMI Infotainment or by the Cellular Telephone -R54-.
The microphones for the Microphone Unit In Front Roof Module -W1- are integrated in the Front Interior Lamp -R164-. On microphone (Left Front Microphone -R140-) is connected directly to the Information Electronics Control Module 1 -J794-.
- Bluetooth hands-free calling information electronics control module 1 -J794-
The Information Electronics Control Module 1 -J794- is installed with the Microphone Unit In Front Roof Module -R164- and is part of the hands-free setup. Bluetooth connect the Cell Phone -R54-.
The Bluetooth Antenna -R152- is integrated in the Information Electronics Control Module 1 -J794-.
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
A standardized radio connection system is used to transmit data between Information Electronics Control Module 1 -J794- and Cellular Telephone -R54- - Bluetooth Technology.
An additional transmitter/receiver unit is installed in the Information Electronics Control Module 1 -J794-. A separate Bluetooth antenna -R152- connects the information electronics control module 1 -J794- and cellular telephone -R54-.
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.