wheel AUDI A4 1998 B5 / 1.G Brakes ABS EDL ASR Bosch 5.3 Workshop Manual

01-122

ABS/EDL
-K47- Brake
system ASR

-
K86-
1) Reasons why the indicator lamps light up










X










X1) For all vehicles:
For vehicles with control modules that do not provide EBD emergency mode:
If activation of both the ABS warning light -K47- and traction control indicator light -K86- is
OK and the voltage supply is OK, the warning lamps light up for 2 seconds during the self-
test after ignition is switched on.
Check the voltage supply for the red "brake system malfunction" symbol. Carry out
"Electrical test" step 9, page 01
-166
. If the control is malfunctioning, see the next
example for lighted indicator lights.
For DTCs stored in DTC memory that are no longer detected during the self-test when
ignition is switched on or when a specific vehicle speed is reached and are found to be OK
when checked, the red "brake system malfunction" symbol does not light up. For
example:If there was a dynamic malfunction of the wheel speed sensor during the last
driving period, the warning lamps automatically switch off after vehicle is restarted if wheel
speed sensor is tested as OK once a vehicle speed of 2.75 km/h is reached.
- These vehicles can be identified by checking the note column under "Check control module
version"; page 01
-128
.
Voltage supply for the ABS control module -J104- is between 7 and 10 volts and the
vehicle speed is 12 km/h. If the vehicle speed exceeds 6 km/h, a DTC entry will be
made in DTC memory. At a vehicle speed of > 12 km/h, the red "brake system
malfunction" symbol lights up; "Check DTC memory" page 01
-187

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ge 4 of 11 ABS/EDL/ASR Bosch 5.3
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.SU02.01.9

01-124

ABS/EDL
-K47- Brake
system ASR

-
K86-
1) Reasons why the indicator lamps light up









X









X









X1) The vehicle can be equipped either with or without ASR. The ABS/EDL lamp remains
constantly lit after ignition is switched on and the the red "brake system malfunction" symbol
also lights up 3 seconds after ignition is switched on.
WARNING!
Driving the vehicle presents the risk of accident! The brake system will only be partially
functional. Because brake pressure at the rear wheels is no longer regulated vie
Electronic Brake Distribution (EBD), the rear wheels tend to brake excessively. This
causes the rear of the vehicle to break loose.
For all vehicles:

The VAG1551 Scan Tool (ST) is connected and the data link to the ABS control module
(w/EDL) -J104- was established. For vehicles with automatic transmission and high-line
instrument cluster, the red "brake system malfunction" symbol does not appear
immediately after the ignition is switched on. Instead, the note "Depress brake pedal
before engaging gear" appears in the display. Press the brake pedal and select a gear.
The red brake warning light appears, if the light control is working properly.
On Board Diagnostic (OBD) recognized a malfunction that led to deactivation of Electronic
Brake Distribution (EBD), ABS, EDL or ASR. "Check DTC memory" page 01
-187

1) The traction control indicator light is only available in vehicles equipped with ASR.
Pa
ge 7 of 11 ABS/EDL/ASR Bosch 5.3
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.9