Volkswagen The Golf 2004 Service Training page 50

Convenience and safety electronics
Multi-function steering wheel
System overview
Data is exchanged between the multi-function
steering wheel and the steering column switch
module via a LIN data bus.
Communication of the signals from the steering
column electronics control unit to the data bus
diagnostic interface is done via the CAN data
bus, from where these signals are then passed on
to the relevant control units.
The functions of the multi-function steering wheel
become active as soon as the ignition is switched
on.
Key
E221 Operating unit in steering wheel
J285 Control unit with display in dash panel insert
J412 Mobile telephone operating electronics control
unit
J503 Control unit with display for radio and
navigation
J527 Steering column electronics control unit
J533 Data bus diagnostic interface
R Radio
R54 mobile cellular telephone
R66 Aerial for telephone, navigation, auxiliary
heater
50
E221
J285
R66
J412
R54
J527
J533
J503
R
15
30
S319_019