Volkswagen Passat 1995 Official Factory Repair Manual page 3151

Teves 04 Anti-lock Brakes (ABS) and Anti-lock Brakes with Electronic Differential Lock (ABS/EDL), ...
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Malfunctions are stored with differing priorities:
solenoid valve malfunctions have the highest
priority, while sporadic malfunctions have the
lowest priority.
After switching the ignition on, the ABS warning
light -K47- lights up for approx. 2 seconds.
During this period a self-test sequence is carried
out by the ABS control module with checks of the
following functions:
Hydraulic pump run at low speed
Brief valve activation after switching the ignition
on
If an ABS malfunction is stored, ABS is switched
off and the ABS warning light -K47- remains on.
If an EDL malfunction is stored, the EDL system
is switched off. These malfunctions are not
indicated by the ABS warning light -K47-.
If ABS or ABS/EDL is switched off because a
malfunction has been stored, the conventional
hydraulic brake system remains fully
operational.
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