Volkswagen Passat 1995 Official Factory Repair Manual page 3225

Teves 20 GI Anti-lock Brakes (ABS) and Anti-lock Brakes with Electronic Differential Lock (ABS/EDL...
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Function
The 25-pin ABS control module -J104- and the
ABS hydraulic unit make up a compact
assembly, located on the left side of the engine
compartment. The ABS control module is
equipped with Diagnostic Trouble Code (DTC)
memory and On Board Diagnostic (OBD)
capability. The 16-pin Data Link Connector (DLC)
is located behind a cover next to the ashtray.
"On Board Diagnostic (OBD)" refers to the
electrical and electronic parts of ABS or
ABS/EDL; in other words, only malfunctions
related to the electrical connections to the ABS
control module are recognized (e.g. inlet or outlet
valve open circuit).
The ABS control module recognizes malfunctions
during ABS or ABS/EDL operation and stores
them in permanent memory, the contents of
which can be recalled years later even if battery
power has been disconnected.
Isolated malfunctions that occur sporadically are
also recognized and stored. If these malfunctions
do not occur again within the next 50 vehicle
starts and driving sequences, DTC memory will
be erased with the exception of "control module
malfunctioning".
After switching the ignition on, the ABS warning
light -K47- and the warning light for brake system
-K118- light up for approx. 2 seconds.
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