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 Systems
General Information
Two versions of the telephone system are possible. As a complete telephone system and a cellular telephone preparation.
The telephone system or cellular telephone preparation is available only with a radio/radio-navigation system
It is possible to retrofit telephones (cellular telephones -R54-) in vehicles with telephone preparation.
The telephone transceiver -R36- is already factory installed on vehicles with cell phone preparation.
Only one adapter is needed for the telephone baseplate -R126-. It depends on which cellular telephone -R54- is going to be used.
The entire system, including the cellular telephone -R54- is installed in vehicles having a telephone system.
Cellular telephone preparation "UHV Low" and "UHV Premium Light" became available beginning with MY 2009.
The cellular telephone preparation "UHV Low" is also known as "universal cellular telephone preparation Low" with a telephone baseplate -R126- inside the center console.
Bluetooth for the cellular telephone -R54- is not supported. The telephone baseplate -R126- controls the telephone. The telephone antenna -R65- is connected to the telephone baseplate -R126-.
The cellular telephone preparation "UHV Premium Light" is also known as the "universal cellular telephone preparation Premium Light " with Bluetooth technology and an optional telephone baseplate -R126- inside the center console. The telephone antenna -R65- is connected to the cellular telephone preparation.
The "UHV Premium Light" is a fixed installation telephone without a wire connection; telephone data is stored via Bluetooth to the cellular telephone -R54- registered to the vehicle.
"UHV Premium Light" strictly requires, that the cellular telephone -R54- is interfaced via Bluetooth and supports "Remote SIM Access Profile" (rSAP).
With rSAP, telephone entries, for example, can be accessed on the cell phone SIM card.
For additional information, refer to the Owner's manual.
Troubleshooting
Telephone systems are equipped with On Board Diagnostic (OBD) capabilities.
Use the Vehicle diagnostic tester under "Guided Fault Finding".
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.