ECO mode 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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01-123

ABS/EDL
-K47- Brake
system ASR

-
K86-
1) Possible reasons why the indicator lamps light up






X






X1) For vehicles with control modules that provide EBD emergency mode:
- These vehicles can be identified by checking the note column under "Check control module
version"; page 01
-128
.
A DTC is stored in the DTC memory the first time the vehicle exceeds 6 km/h, if the
voltage supply to the ABS control module -J104- is between 7 and 10 volts and the
indicator lights go on. If the voltage supply of the ABS control module -J104- exceeds 10
volts while driving, the indicator lights switch off. The DTC remains in the memory. If the
voltage supply value drops below 10 volts again during the same driving cycle, the
indicator lamps light up again. "Check DTC memory" page 01
-187

The indicator lights do not switch off after the self-test. However, the red "brake system
malfunction" symbol did not go on. On Board Diagnostic (OBD) recognized a malfunction
that did not deactivate the Electronic Brake Distribution (EBD) system. "Check DTC
memory" page 01
-187

1) The traction control indicator light is only available in vehicles equipped with ASR.
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pair&id=AUDI.B5.SU02.01.9

01-126

ABS/EDL
-K47- Brake
system ASR

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






X1) The vehicle is equipped with ASR:
There is a malfunction that affects only the ASR system. The ABS and EDL systems are
not deactivated. Check DTC memory page 01
-187

ASR is switched off via the traction control button. If the traction control indicator light
does not light up in this case, check the switch and the indicator light, carry out the
"Electrical test", steps 10 and 11 page 01
-166
.
ASR is in adjustment mode. The traction control indicator light blinks 3 times per second.Short circuit to B+ in the traction control button: The traction control indicator light
switches off five minutes after ignition is switched on. The lamp remains constantly lit after ignition is switched on, but none of the above
mentioned conditions are true. There is a short to Ground (GND) in the wiring that
controls the traction control indicator light between terminal 20 of the ABS control module
-J104- and the instrument cluster.



There is an irregularity present or a complaint has been made. The indicator lamps go
on during the self-test and then go out. The possible causes are as follows: The DTC "Brake light switch -F-" is stored in DTC memory , check DTC memory page 01
-187
.
The DTC "ABS/instrument cluster electrical connection" is stored in DTC memory , check
DTC memory page 01
-187
.
Pa
ge 9 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