Volkswagen Passat 1995 Official Factory Repair Manual page 3150

Teves 04 Anti-lock Brakes (ABS) and Anti-lock Brakes with Electronic Differential Lock (ABS/EDL), ...
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Function
Teves 04
The ABS control module -J104- is equipped with
Diagnostic Trouble Code (DTC) memory and On
Board Diagnostic (OBD) capability. The ABS
control module is located under the rear seat, left
side. The on board diagnostic Data Link
Connectors (DLC) are located under a cover on
the right below instrument cluster.
The term "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 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 but, in contrast to
other systems with On Board Diagnostic (OBD)
capability, these are stored without the
addendum "SP" (sporadic) in the scan tool
display.
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12/7/2004