10
Data bus diagnostic
interface J533 (gateway)
The wide range of interlinked vehicle
functions necessitates the use of several data
bus systems on account of the capacity
required for handling the great volume of data
to be transmitted.
The data bus diagnostic interface is a network
gateway for data bus systems, the principal
function of which is to form the interface
between the various independent data bus
systems in the vehicle.
In the past, the gateway function was
integrated into the dash panel insert. A
separate control unit is employed in the
Audi A8 ´03 to cope with the large number of
functions distributed over various control
units and requiring a high level of data
transfer between the control units of the
different bus systems.
Versions
Two different data bus diagnostic interface
J533 versions are used in the Audi A8 ´03: One
with connection to the optional adaptive
cruise control (ACC) system and the other
without this connection.
Both versions however feature a connection
for the MOST optical data bus fitted as
standard.
Control Units
SSP287_001
SSP287_002
Diagnosis CAN
500 kbit/s
Dash panel insert
CAN 500 kbit/s
Drive system CAN
500 kbit/s
MOST
21 Mbit/s
Adaptive cruise
control CAN
500 kbit/s
(optional)
Convenience
CAN
100 kbit/s
Optical
output
Optical
input
Electrical connection
