lock AUDI A4 1998 B5 / 1.G Airbag Service OBD Workshop Manual

01-5


Airbag system (with and
without side airbag) On Board
Diagnostic (OBD)

General Information


Vehicles 1997
The airbag system includes a driver-side airbag,
passenger-side airbag, and two front seat belt
tensioners. These are ignited centrally by the
airbag control module -J234- if the specified
activation criteria are met during a crash.

Vehicles 1997 1999 : up to VIN 8D XA 200
000 The airbag system includes a driver-side airbag,
passenger-side airbag, two front seat belt
tensioners, side airbag, driver's side, side airbag,
passenger side, and two or three (1998 and on )
rear seat belt tensioners. If the specified
activation criteria are met during a crash, they
are ignited centrally by the airbag control module
-J234-.
Regardless of the type of crash or crash
intensity, the airbag control module sends a
"crash signal" to the central locking control
module. This function provides passive security.
With the help of the central locking system, it
unlocks the doors, opens the rear lid and blocks
Pa
ge 1 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

01-6

1999 vehicles : from VIN 8D XA 200 001 Airbag system includes: side airbag, passenger-
side airbag, two front seat belt tensioners, two
front side airbags, two or three rear seat belt
tensioners and side curtain airbags. In a crash
situation, these are ignited centrally by the airbag
control module -J234- when specified triggering
criteria are met.
In a crash situation, the control module sends a
crash signal to the central locking control
module. This function is a passive safety feature.
It releases door locks and the rear lid lock via the
central locking system if an airbag and/or belt
tensioner is triggered. Also, inside door lock
switches are blocked and interior lighting is
switched on. The "crash signal" can be checked
using output Diagnostic Test Mode (DTM)
page 01
-44
.
When the airbags and/or belt tensioners are
deployed, the control module will record the DTC
"Crash data stored."
Airbag control module -J234- must be replaced
following:

The 1st driver-side/passenger-side airbag
deployment.
The 3rd time front seat belt tensioners and/or
Pa
ge 3 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

01-10

All vehicles

-
Press button to advance through program
sequence. Rapid data transfer
HELP
Select function XX

Indicated on display
Note:
A list of available functions is printed out when the HELP button is
pressed.
On Board Diagnostic (OBD) functions
The following functions are possible:
01 - Check Control Module Versions page 01
-41

02 - Check DTC Memory page 01
-11

03 - Output Diagnostic Test Mode (vehicles 1997 1998 only page
01
-44
) (vehicles 1999 only page 01
-46
)
05 - Erase DTC Memory page 01
-137

06 - End Output page 01
-139

07 - Code Control Module page 01
-51

08 - Read Measuring Value Block page 01
-57

Note:
Pa
ge 10 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

01-37

DTC


VAG 1551 scan tool display
Possible cause
Corrective action
01222
Crash Sens. Side Airbag Pass. Side-
G180 (sensor for lateral acceleration)
Short circuit
Short circuit in wiring to B+ or
Ground Crash sensor for side airbag,
passenger side -G180- faulty Airbag control module -J234-
faulty Electrical Wiring Diagrams,
Troubleshooting & Component Locations
binder - Repair wiring according to wiring diagram.
- Replace crash sensor -G180-.
- Replace airbag control module -J234-.
01222
Crash Sens. Side Airbag Pass. Side-
G180 (sensor for lateral acceleration)
Not authorized
Airbag control module -J234-
incorrectly coded Control module and crash
sensor do not match - Replace control module -J234-.
- Replace crash sensor -G180-.
01223
Signal Open Central Locking Airbag control module -J234-
faulty - Replace airbag control module -J234-.
01280 1)
Airbag Passenger Side Switched Off Passenger-side airbag was
switched off during adaptation - Adapt airbag control module -J234- as
appropriate.
Pa
ge 49 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

01-44

Output Diagnostic Test Mode (scan tool
function 03) (vehicles 1997 1998)

The Output Diagnostic Test Mode is used to
check operation of the crash response system.
When airbags are triggered, the central locking
system unlocks the doors and simultaneously
blocks internal switches. Emergency flashers and
interior lights are switched on.

Notes:
Before initiating the Output Diagnostic Test
Mode, switch central locking system to "closed"
by operating internal switch.

Carrying out "Output Diagnostic Test Mode"
function 03 Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -3- to select "Output Diagnostic Test Mode"
function 03.
Rapid data transfer
Q
03 - Output Dia
gnostic Test Mode

Indicated on display
- Press -Q- button to confirm input.
Output Diagnostic Test Mode Signal: Open central locking system

Indicated on display
The central locking system must switch to "open."
Pa
ge 58 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

Emergency flashers and interior lights switch on.
- Operate internal switch.
Central locking must switch back to "closed."
Pa
ge 59 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

01-46

Output Diagnostic Test Mode (scan tool
function 03) (vehicles 1999 )


Vehicles up to calendar week (KW) 18.99
Output Diagnostic Test Mode (DTM) is used to
check the operation of the crash response
system. When airbags are triggered, the central
locking system switches immediately to "open"
and the inside door lock switches are blocked.
Emergency flashers and interior lights are
switched on.

Notes:

Before initiating output Diagnostic Test Mode
(DTM), set the central locking system to
"closed" by operating the interior switch.
Set interior switch to "door contact" position.
After output DTM is initiated, central locking
cannot be operated until the DTC memory of
the central locking control module is erased.

Carrying out "Output Diagnostic Test
Mode" (function 03)
Rapid data transfer
HELP
Select function XX

Indicated on display
-
Press buttons -0- and -3- to select "Output Diagnostic Test Mode"
Pa
ge 61 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

01-47

Output Diagnostic Test Mode Signal: Open central lockin
g system

Indicated on display
Central locking must switch to "open."
Emergency flashers and interior lights switch on.
Notes: - Operate interior switch. Central locking must not switch to "closed" as
long as DTC is still stored in central locking control module.
After this procedure step, DTC 01366 is stored in the DTC memory of
the central locking control module. After completion of output Diagnostic Test Mode (DTM), the DTC
memory of the central locking control module must be checked and
this DTC must be erased page 01
-74
.
Output Diagnostic Test Mode END

Indicated on display
-
Press button.
Rapid data transfer
HELP
Select function XX

Indicated on display
Pa
ge 63 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