Audi A8 2019 Service Training page 64

Front Passenger Airbag -Disabled- Indicator Lamp K145
New to the 2019 A8, signals are no longer transmitted
across discrete wires to Front Passenger Airbag -Disabled-
Indicator Lamp K145. Instead, the signals are transmitted
from Airbag Control Module J234 to Data Bus on Board
Diagnostic Interface J533 via the FlexRay data bus. From
here, the information is transmitted to the Vehicle Electri-
cal System Control Module J519 via the convenience CAN.
J519 sends information across the LIN bus to Roof Elec-
tronics Control Module J528, which ultimately activates the
Front Passenger Airbag -Disabled- Indicator Lamp K145.
The front passenger airbag OFF warning lamp indicates
whether the front passenger airbag is on or off.
Signal transfer
Data Bus on Board Diagnostic Interface
J533
Key:
FlexRay
Comfort/convenience
systems CAN 2
Note
This applies to all vehicles that are based on the modular longitudinal platform and which use the FlexRay data bus to com-
municate with the Airbag Control Module J234.
60
Airbag Control
Vehicle Electrical
Module
System Control
J234
Module
J519
LIN bus
Input signal
Output signal
Text indicating the status of the
front passenger airbag
Roof Electronics
Control Module
J528
Front Passenger Airbag -Disabled- Indicator Lamp
K145
ON warning lamp
OFF warning lamp
662_020
662_019