Audi A4. Body repair manual - part 33
Airbag system (with and without side airbag) On Board Diagnostic (OBD)
For vehicles with airbag 8 (
10/98) the crash
signal cannot be erased using the VAG1551
scan tool after the 3rd deployment.
Airbag system (with and without side airbag) On Board Diagnostic (OBD)
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!
Airbag system (with and without side airbag) On Board Diagnostic (OBD)
switched off!
Airbag system (with and without side airbag) On Board Diagnostic (OBD)
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
Airbag system (with and without side airbag) On Board Diagnostic (OBD)
(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.
Airbag system (with and without side airbag) On Board Diagnostic (OBD)
Rapid data transfer
HELP
Indicated on display
Insert address word XX
Address word for the airbag system: 15
- Press buttons -1- and -5- to insert "Airbag" address word 15.
Rapid data transfer
Q
Indicated on display
15 - Airbag
- Press -Q- button to confirm input.
Rapid data transfer
Indicated on display
Scan Tool sends address word 15
Vehicles
1997:
8A0959655D
Airbag V AUDI
Indicated on display after about 5 seconds
D02
Coding 00766
WSC 06812
Vehicles 1997 up to 1999: VIN 8DXA 200 000
8D0959655C
Airbag 7
AUDI D00
- Indicated on display after approx. 5 seconds
Coding 00102
WSC 06812
Vehicles 1999
: from VIN 8D XA 200 001
8D0959655J Airbag Front+Side
0004
- Indicated on display after approx. 5 seconds:
Coding 01106
WSC 06812
Front and side airbag or front and side curtain airbag
Airbag system (with and without side airbag) On Board Diagnostic (OBD)
All vehicles
- Press button to advance through program
sequence.
Rapid data transfer
HELP
Indicated on display
Select function XX
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:
Airbag system (with and without side airbag) On Board Diagnostic (OBD)
Airbag system (with and without side airbag) On Board Diagnostic (OBD)
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
Indicated on display
Select function XX
- Press buttons -0- and -2- to select "Check DTC Memory" function 02.
Rapid data transfer
Q
Indicated on display
02 - Check DTC Memory
- 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.
Airbag system (with and without side airbag) On Board Diagnostic (OBD)
Rapid data transfer
HELP
Indicated on display
Select function XX
If something else is displayed:
Scan tool operating instructions
- Erase DTC Memory (function 05) page 01-137 .
- End Output (function 06) page 01-139 .
- Disconnect VAG1551 Scan Tool (ST) from Data Link Connector (DLC).
Airbag system (with and without side airbag) On Board Diagnostic (OBD)
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.
Airbag system (with and without side airbag) On Board Diagnostic (OBD)
DTC
VAG 1551 scan tool
Possible cause
Corrective action
display
00532
Supply voltage B+
Battery discharged or faulty
- Recharge or replace battery.
Supply voltage too low
Short circuit in vehicle
- Repair short circuit in vehicle electrical system.
electrical system
00588
Airbag Igniter-Driver
Open circuit in wiring
- Repair wiring according to wiring diagram.
Side-N95
Spiral spring faulty
Electrical Wiring Diagrams, Troubleshooting & Component
Resistance value too
Locations binder
large
Driver-side airbag unit faulty
Airbag control module -J234-
- Check spiral spring.
faulty
- Replace driver-side airbag unit.
- Replace airbag control module -J234-.
00588
Airbag Igniter-Driver
Short circuit in wiring
- Repair wiring according to wiring diagram.
Side-N95
Spiral spring faulty
Electrical Wiring Diagrams, Troubleshooting & Component
Resistance value too
Locations binder
Driver-side airbag unit faulty
small
Airbag control module -J234-
- Check spiral spring.
faulty
Airbag system (with and without side airbag) On Board Diagnostic (OBD)
- Replace airbag control module -J234-.