Volkswagen Golf / Golf GTI / Jetta. Manual — part 807

01-5

Airbag system, On Board
Diagnostic (OBD)

Function

The Airbag Control Module -J234- is located

behind the console on the tunnel. It is
equipped with a DTC memory. The On
Board Diagnostic (OBD) connection is
located under the driver's knee bar to left of
the steering wheel.

The control module detects malfunctions in

the airbag system and stores them in a
permanent memory.

Malfunctions which can be attributed to a

temporary open circuit in the wiring or a
loose contact, will also be stored. These
malfunctions will be displayed as sporadic
DTCs "SP".

After the ignition is switched on, the Airbag

Malfunction Indicator Lamp (MIL) -K75-
comes on for about 4 seconds and then
goes out again. If the lamp then flashes for a
further 15 seconds this signals that the
airbags or the belt tensioners are
electronically blocked.

Airbag system, On Board Diagnostic (OBD)

13/2/2005

01-6

If the warning lamp -K75- does not go out again

after about 4 seconds, then the voltage supply
to the Airbag Control Module -J234- is
malfunctioning. Check DTC memory

Page

01-30

.

A malfunction is present if the warning lamp -

K75- lights up again. Check DTC memory

Page 01-30

.

If the warning lamp -K75- flashes continuously

then the control module -J234- must be
replaced.

To commence troubleshooting, initiate self-

diagnosis and retrieve the stored information with
the V.A.G 1551 scan tool.

The malfunction information displayed is used to

refer to a DTC table with notes on the possible
causes for directed repair measures.

WARNING!

Only visual check of wiring!

Do not carry out electrical continuity tests or
measurements to igniter circuits!

Only check wiring with ignition switched
off!

Airbag system, On Board Diagnostic (OBD)

13/2/2005

01-7

Introducing On Board Diagnostic (OBD) for
airbag

- Connecting scan tool

Page 01-3

.

- Switch on printer with Print button (warning lamp

in button lights up).

- Switch on ignition.

Rapid data transfer

HELP

Enter address word XX

Indicated on display:

- Press buttons -1- and -5- (the address word of

the vehicle system to be tested "Airbag" is
entered with 15).

Rapid data transfer

Q

15 Airbag

Indicated on display:

- Confirm entry with the -Q- button.

Rapid data transfer

HELP

Select function XX

Indicated on display:

Note:

Rapid data transfer

HELP

control module does not answer!

If one of the malfunction messages opposite

appears in the display, the possible causes of
the malfunction can be printed out with the
HELP button.

Rapid data transfer

HELP

K wire not switching to B+!

Ignition must be switched on.

Rapid data transfer

No signal from control module!

Malfunctions have occurred at the start of or

during the program (external interference?).

Airbag system, On Board Diagnostic (OBD)

13/2/2005

01-8

Note:

Rapid data transfer

Fault in communication build up

Check diagnosis wires as well as

voltage supply and Ground
connection.

- After repairing the possible

causes of the fault, once again
enter the address word 15 for
"Airbag" by pressing -1- and -5-
buttons and confirm with the -Q-
button.

Rapid data transfer

Tester sends the address word 15

Indicated in display after entering the

address word 15:

and then the following appears in the
display:

1J0 909 608 D AIRBAG VW 3-S V03

Coding 00068

WSC12345

Indicated on display (see parts

catalog for latest control module
version).

- Press

button.

Rapid data transfer

HELP

Select function XX

Indicated on display:

Airbag system, On Board Diagnostic (OBD)

13/2/2005