ESP AUDI A4 1999 B5 / 1.G Brakes Erase DTC Memory End Output Workshop Manual

01-17

Safety precautions and troubleshooting
basics


ABS/EDL/ASR and ESP are vehicle safety
systems; working on these systems requires
specific system knowledge.
There are two different versions of instrument
cluster: with or without Driver Information
System (DIS).

Instrument cluster without DIS
If On Board Diagnostic (OBD) has detected a malfunction in the
system, it indicates the malfunction by lighting up warning lamps when
ignition is switched on. The warning lamps are located in the
instrument cluster. This appears in both versions, with or without DIS.
The instrument cluster without DIS displays the ABS warning light -
K47- (right arrow), the warning light for brake system -K118- (center
arrow, red symbol for "brake system malfunction") and the traction
control indicator light -K86- (left arrow). For additional information, see
the section titled "Overview of indicator lamp functions".
Pa
ge 7 of 15 Erase DTC Memor
y (function 05
), End Out
put
(function 06
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.2

01-18


Instrument cluster with DIS
Repair manual, Brake System, Repair Group 45; ESP component overview

For DIS, the warning light for brake system -K118- "brake system
malfunction" appears in the display. If the ABS warning light -K47 and the red symbol for "Brake system
malfunction" are not lit, but the brake system is not functioning
properly, check for malfunctions in the mechanical/hydraulic brake
system components.
Pa
ge 8 of 15 Erase DTC Memor
y (function 05
), End Out
put
(function 06
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.2

01-21

Only replace a malfunctioning component if you
are certain that all electrical wires to this
component are functioning properly. The lines
must work properly and be capable of carrying
all signals without any problems. Check the
lines for the following:

- Corrosion or loose connections in the
connectors or Ground straps. If there are bent,
broken, or corroded contacts on the
connectors, replace the contacts using
VAS1978 wiring harness repair kit.

- Open circuit in wiring

- Short circuits to B+ or Ground (GND)

Electrical Wiring Diagrams, Troubleshooting &
Component Locations

Welding work performed with electrical welding
equipment can affect the ABS/ESP system.
Pa
ge 11 of 15 Erase DTC Memor
y (function 05
), End Out
put
(function 06
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.2

01-23

While testing the ESP system, make sure
that the vehicle's electrical system is not
subjected to electromagnetic interference;
keep the vehicle away from equipment with a
high current draw such as electric welding
units.

WARNING!

The diagnostic will not terminate at a speed
of v = > 20 km/h. Risk of accident!
Pa
ge 14 of 15 Erase DTC Memor
y (function 05
), End Out
put
(function 06
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.2