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| When handling a fault it is absolutely essential to know the function and operation of the multi-functional steering wheel. |
| The multi-functional steering wheel contains (depending upon equipment) the following components: |
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| Key module -E440- in the front left steering wheel for the operation of the audio and mobile phone. |
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| Key module on the left (-E439- - shifting down) and right (-E438- - shifting up) on the rear of the steering wheel for the operation of the automatic gearbox in the Tiptronic mode (gearbox DSG). |
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| Multi-functional steering wheel control unit -J453-, integrated in the left front key module. |
| The multi-functional steering wheel control unit -J453- communicates via the LIN databus with the vehicle voltage control unit BCM -J519-. |
| Versions of the multi-functional steering wheel: |
| 1 - | Four-spoke steering wheel |
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| for audio und telephone |
| 2 - | Three-spoke steering wheel |
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| for audio und telephone |
| 3 - | Three-spoke steering wheel |
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| for audio, telephone and gearbox operation in the Tiptronic mode (gearbox DSG) |
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