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System overview
The new Navigation Plus system is fully integrated into the CAN bus architecture of the Audi A3.
Only the optional CD changer exchanges data with the operating electronics control unit, navigation J402 via
a separate bus port (Panasonic bus, See SSP 312). The distance signal is sent from the ABS control unit J104
to the vehicle bus system, where it is picked off by the infotainment CAN bus and utilised for navigation
purposes, as with the signals from the reversing light switch and the telephone mute function of the optional
universal mobile phone preparation II.
A separate pin is provided on the operating electronics control unit, navigation J402 for retrofitting
a thirdparty mobile phone preparation. This pin can be used to send the telephone mute signal to the
Navigation Plus system. When installing, please note that the coding of the Navigation Plus system (operating
electronics control unit, navigation J402) must be adapted accordingly to ensure proper function of the
telephone mute function (See section on 'Diagnosis'). Otherwise, the telephone mute signal will be ignored by
the operating electronics control unit, navigation J402.
332_038
Reference
For information about the
infotainment CAN bus and the
available components, please refer to
SSP 312, Audi A3 ´04 Electrical
System!
Legend
1 Control unit with display in dash panel insert J285
2ABS control unit J104
3TV tuner R78
4Telephone aerial R65
5Left aerial module R108
6CD changer R41
7Front left microphone R140 (for voice control/telephone)
8Operating electronics control unit, navigation J402
9Sound system
10 Telephone transmitter and receiver unit R36
11 16-pin connector T16 (diagnosis plug)
12 Multi-function steering wheel control unit J453
13 Data bus diagnostic interface J533
