wiring AUDI A4 1995 B5 / 1.G Airbag Service OBD Workshop Manual

01-7

All vehicles
The control module detects malfunctions and
errors in the airbag system and stores them in
permanent memory.
After the ignition is switched on, the airbag
Malfunction Indicator Lamp (MIL) -K75- lights for
about 4 seconds and then goes out.

If the airbag Malfunction Indicator Lamp (MIL) -
K75- does not go out after approximately 4
seconds, the voltage supply for the airbag
control module -J234- is not OK. Check DTC
memory page 01
-11
.

If the airbag Malfunction Indicator Lamp (MIL) -
K75- goes out after 4 seconds and then lights
again, either the control module is not coded,
an incorrect control module has been installed
or a malfunction is present. Check DTC
memory page 01
-11
.

CAUTION!

Wiring must only be checked visually!
Do not perform an electrical continuity check
or circuit analysis!

Pa
ge 5 of 74 Airba
g system
(with and without side airba
g)
On Board Dia
gnostic
(OBD
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.BD04.01.2

01-8

Airbag system On Board Diagnostic
(OBD), initiating


Requirements

Power supply and fuses for relevant system
OK

Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder

VAG1551 Scan Tool (ST) connected page 01
-1

Ignition switched on

Notes:
Malfunctions which have only occurred briefly
are classified as "Sporadic malfunctions" and
are identified by the "/SP" on the right side of
the display.
To eliminate these sporadic malfunctions, erase
DTC memory before starting repair work.
Additional operating instructions can be
Pa
ge 7 of 74 Airba
g system
(with and without side airba
g)
On Board Dia
gnostic
(OBD
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.BD04.01.2

01-13
Diagnostic Trouble Code (DTC) table, airbag system

Notes:

In the following table, all the possible malfunctions that can be recognized by the airbag control module -J234- are listed
according to their DTC code numbers. Existing malfunctions will be printed with their 5-digit DTC only if the VAG1551
printer is switched on.
If a malfunction occurs persistently, the airbag Malfunction Indicator Lamp (MIL) -K75- will light up and remain lit until the
malfunction is repaired and the DTC memory has been erased.
If a malfunction occurs only occasionally or if the DTC memory is not erased after a malfunction is repaired, the
malfunction will be displayed as a sporadic malfunction. Such malfunctions are identified by the letters "/SP" to the right on
the VAG1551 display and will cause -K75- to light up continuously.
Before replacing a component shown as malfunctioning, check the wiring to the component for short or open circuit
according to the wiring diagram.
The three digit malfunction type number appearing next to the DTC is a data code which can be disregarded.
Pa
ge 14 of 74 Airba
g system
(with and without side airba
g)
On Board Dia
gnostic
(OBD
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.BD04.01.2

01-14

DTC


VAG 1551 scan tool
display Possible cause
Corrective action
00532
Supply voltage B+
Supply voltage too low
Battery discharged or faulty
Short circuit in vehicle
electrical system - Recharge or replace battery.
- Repair short circuit in vehicle electrical system.
00588
Airbag Igniter-Driver
Side-N95
Resistance value too
large Open circuit in wiring
Spiral spring faulty
Driver-side airbag unit faulty
Airbag control module -J234-
faulty Electrical Wiring Diagrams, Troubleshooting & Component
Locations binder - Repair wiring according to wiring diagram.
- Check spiral spring.
- Replace driver-side airbag unit.
- Replace airbag control module -J234-.
00588
Airbag Igniter-Driver
Side-N95
Resistance value too
small
Short circuit in wiring
Spiral spring faulty
Driver-side airbag unit faulty
Airbag control module -J234-
faulty Electrical Wiring Diagrams, Troubleshooting & Component
Locations binder - Repair wiring according to wiring diagram.
- Check spiral spring.
Pa
ge 15 of 74 Airba
g system
(with and without side airba
g)
On Board Dia
gnostic
(OBD
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.BD04.01.2

01-15

DTC


VAG 1551 scan tool display
Possible cause
Corrective action
00588
Drivers side airbag igniter -N95-
Short circuit to B+
Wire damagedAirbag control module -J234-
malfunctioning
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder - Repair wiring according to wiring diagram
- Replace airbag control module -J234-
00588
Drivers side airbag igniter -N95-
Short circuit to Ground
Wire damagedDriver-side airbag unit
malfunctioning Airbag control module -J234-
malfunctioning
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder - Repair wiring according to wiring diagram
- Replace driver-side airbag unit
- Replace airbag control module -J234-
Pa
ge 17 of 74 Airba
g system
(with and without side airba
g)
On Board Dia
gnostic
(OBD
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.BD04.01.2

01-16

DTC


VAG 1551 scan tool
display Possible cause
Corrective action
00589
Airbag Igniter 1-Passenger
Side-N131
Resistance value too large

Open circuit in wiringPassenger-side airbag unit
faulty Airbag control module -
J234- faulty Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder - Repair wiring according to wiring diagram.
- Replace passenger-side airbag unit.
- Replace airbag control module -J234-.
00589
Airbag Igniter 1-Passenger
Side-N131
Resistance value too small
Short circuit in wiringPassenger-side airbag unit
faulty Airbag control module -
J234- faulty Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder - Repair wiring according to wiring diagram.
- Replace passenger-side airbag unit.
- Replace airbag control module -J234-.
Pa
ge 18 of 74 Airba
g system
(with and without side airba
g)
On Board Dia
gnostic
(OBD
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.BD04.01.2

01-17

DTC


VAG 1551 scan tool display
Possible cause
Corrective action
00589
Passengers side airbag igniter 1 -
N131- Short circuit to B+
Wire damagedAirbag control module -J234-
malfunctioning Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder - Repair wiring according to wiring diagram
- Replace airbag control module -J234-
00589
Passengers side airbag igniter 1 -
N131- Short circuit to Ground
Wire damagedPassenger-side airbag unit
malfunctioning Airbag control module -J234-
malfunctioning Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder - Repair wiring according to wiring diagram
- Replace passenger-side airbag unit
- Replace airbag control module -J234-
Pa
ge 19 of 74 Airba
g system
(with and without side airba
g)
On Board Dia
gnostic
(OBD
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.BD04.01.2

01-18

V.A.G 1551 print-out
Possible malfunction cause
Corrective action
00589
Igniter 1 for airbag (passenger's
side) -N131
Short to Ground
Wiring damagedFront passenger's airbag
unit faulty Airbag control unit -J234
faulty Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder - Repair per wiring diagram
- Replace front passenger's airbag unit
- Replace airbag control unit -J234
00591
Left Seat Belt Switch -E24
Implausible switch condition
Left belt lock switch faulty- Replace left belt lock switch
00591
Left Seat Belt Switch -E24
Short circuit to positive Wiring damaged
Electrical Wiring Diagrams, Troubleshooting &
Component Locations binder - Check and repair wiring harness
- Repair per wiring diagram
00591
Left Seat Belt Switch -E24
Short circuit to Ground
Wiring damaged
Electrical Wiring Diagrams, Troubleshooting & - Check and repair wiring harness
- Repair per wiring diagram
Pa
ge 20 of 74 Airba
g system
(with and without side airba
g)
On Board Dia
gnostic
(OBD
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.BD04.01.2

01-19

V.A.G 1551 print-out
Possible malfunction
cause Corrective action
00592
Right Seat Belt Switch -
E25
Implausible switch
condition
Right belt lock switch
faulty - Replace right belt lock switch
00592
Right Seat Belt Switch -
E25
Short circuit to positive Wiring damaged
Electrical Wiring Diagrams, Troubleshooting & Component
Locations binder - Check and repair wiring harness
- Repair per wiring diagram
00592
Right Seat Belt Switch -
E25
Short circuit to Ground
Wiring damaged
Electrical Wiring Diagrams, Troubleshooting & Component
Locations binder - Check and repair wiring harness
- Repair per wiring diagram
Pa
ge 22 of 74 Airba
g system
(with and without side airba
g)
On Board Dia
gnostic
(OBD
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.BD04.01.2

01-20

DTC


VAG 1551 scan tool
display Possible cause
Corrective action
00594
Airbag Ignition
Circuit
Short circuit to B+
Wiring damaged
Airbag control module -
J234- faulty Electrical Wiring Diagrams, Troubleshooting & Component
Locations binder - Repair wiring according to wiring diagram.
- Replace airbag control module -J234-.
00594
Airbag Ignition
Circuit
Short circuit to
Ground
Wiring damaged
Spiral spring faulty
Driver-side airbag faulty
Airbag control module -
J234- faulty Electrical Wiring Diagrams, Troubleshooting & Component
Locations binder - Repair wiring according to wiring diagram.
- Check spiral spring.
- Replace driver-side airbag unit.
- Replace airbag control module -J234-.
00595
Crash Data Stored

Frontal collision
Side collision- Replace airbag control module, airbag units, seat belt tensioners
and if necessary, faulty components.
Pa
ge 23 of 74 Airba
g system
(with and without side airba
g)
On Board Dia
gnostic
(OBD
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.BD04.01.2