Audi A8 2019 Service Training page 63

Assistance system monitor (ASM)
Introduction
The 2019 A8 is equipped worldwide with an assistance
system monitor.
The ASM is integrated in Airbag Control Module J234 as a
software module. The task of the ASM is to record the data
from the driver assistance systems installed in the vehicle
over a period of approximately ten seconds before an acci-
dent or a near-accident event. The data is written to a ring
memory. This ring memory continuously records the last
ten seconds of vehicle data while driving. Data which is
older than ten seconds is either actively cleared again or
overwritten by new data. If the airbag control module
detects an accident or a near-accident event, the last
approximately ten seconds of vehicle data before the acci-
dent is transferred to a read-only memory.
Diagnostics
The ASM can be deactivated by service personnel using the
"Guided Fault Finding" function. There is a special ASM
deactivation form which must be filled out and signed by
the customer.
Reference
For further information about the EDR and ASM, refer to the Owner's Manual.
As with the EDR, the ASM has a read-only memory consist-
ing of six blocks. In this case, too, the relevant data is
successively written to the blocks after an accident or a
near-accident event. Generally, a distinction is made
between static and dynamic data, both of which are
recorded. Static data indicates whether a driver assistance
system is on or off, while dynamic data indicates whether
the ESC (Electronic Stability Control) has made corrective
inputs or not. The ASM is able to record data from the
driver assistance systems, for example, adaptive cruise
assist, ESC (Electronic Stability Control), Audi pre sense and
others.
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