lights AUDI A4 1999 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

obtained by pressing the VAG1551 Scan Tool
(ST) HELP button.
The button is used to advance through the
program sequence.

- Switch printer on by pressing PRINT button
(indicator lamp in button lights up).

- Press button -1- to select "Rapid data transfer"
operating mode 1.
Pa
ge 8 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

01-11

Check DTC Memory (scan tool function
02)


Note:
The DTC display information is updated only
when initiating the On Board Diagnostic (OBD) or
"Erase DTC Memory" function 05.

- Switch printer on by pressing PRINT button
(indicator lamp in button lights up).

Carrying out "Check DTC Memory" function
02
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -2- to select "Check DTC Memory" function 02.
Rapid data transfer
Q
02 - Check DTC Memor
y

Indicated on display
- Press -Q- button to confirm input.
X DTC recognized

Indicated on display (number of stored Diagnostic Trouble Codes, DTCs).
or:
No DTC recognized

If the message "No DTC recognized" is displayed, the program can be
returned to the starting point by pressing the button.
Pa
ge 12 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
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)
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p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
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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

01-48

Vehicles from calendar week (KW) 18.99 on
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 and the fuel supply is interrupted.

Notes:

Before initiating output Diagnostic Test Mode
(DTM), set the central locking system to
"closed" by operating the interior switch and
start the engine.
Set interior light 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"
function 03.
Pa
ge 64 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

01-49

Output Diagnostic Test Mode Signal: Open central lockin
g system

Indicated on display
Engine must stop running
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
.
Several DTCs will be stored in the DTC memory of the Engine Control
Module (ECM) after this procedure. After completing output Diagnostic Test Mode (DTM), the DTC
memory of the Engine Control Module (ECM) must be checked and
erased. This procedure varies depending on the fuel injection and
ignition system installed in the vehicle. Refer to Repair Group 01 of
the appropriate repair manual DTC memory, checking and erasing. Depending on engine type, fuel shut-off is a running-change as of KW
18.99.
Pa
ge 66 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