Volkswagen The Golf 2004 Service Training page 34

Onboard power supply
Control unit with display in dash panel insert J285
The control unit with display in the dash panel
insert receives its information via the data bus
diagnostic interface J533 and the dash panel
insert CAN data bus.
Further external sensor signals are sent to the
dash panel insert via separate wiring:
F1 Oil pressure switch
F34 Front left brake pad wear warning contact
G17Ambient temperature sender,
located in bumper
G32Coolant shortage indicator sender
G33Windscreen washer fluid level sender
(optional)
G34Front left brake pad wear sender
J538Fuel pump control unit
Versions
The sections in the display vary depending on the
three versions of dash panel insert:
Lowline version
Midline version
Highline version
LED warning lamps only appear in the upper
area on Lowline and Midline versions.
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Diagnosis
Diagnosis of the control unit with display in
the dash panel insert is carried out using the
diagnosis tester VAS 5051/5052 via the
CAN data bus.
Furthermore, the dash panel insert control unit is
capable of self-monitoring. If a fault occurs, this
will be shown in the display by the letters "def".
For further information, please refer
to SSP 307
"The Touran - Electrical system".