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| When the horn plate -H- is pressed, a signal is transmitted via the airbag coil connector and return ring with slip ring -F138- (1) to the steering column electronics control unit -J527-, which evaluates the signal. |
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| The steering column electronics control unit -J527- transmits the „horn activated“ signal across the convenience data bus to the onboard supply control unit -J519-. |
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| The onboard supply control unit -J519- activates the horn relay -J413-. |
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| The horn relay -J413- energises the treble horn -H2- and the bass horn -H7-. |
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