WARNING | Disconnect the battery earth cable before working on the electrical system. |
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| When re-connecting battery -A-, always adhere to correct sequence for connecting and disconnecting battery -A- → Electrical System; Rep. gr.27. Deactivate the service module of the telephone control unit -J526-. |
| Six function buttons are integrated into the steering wheel to facilitate operation of the radio and telephone system whilst driving. The multi-function steering wheel is also heated electrically. |
| The electronics integrated into the steering wheel are responsible for transferring the button signals on to LIN data Bus (single-wire Bus) and for dimming the function buttons. The electronics in the steering wheel cannot be replaced separately. The entire steering wheel must be replaced in the event of a defect. |
| The multi-function steering wheel is part of the „steering column switch module“ and provides data for the steering column electronics control unit -J527- via LIN data Bus. |
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