Initial Inspection and Diagnostic Overview
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.
- 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. Displaying & Reading Trouble Codes
- A malfunction is present if the warning lamp -K75- lights up again. Check DTC memory. Displaying & Reading Trouble Codes
- 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.
Introducing On Board Diagnostic (OBD) for airbag
- Connecting scan tool. Scan Tool Connecting
- Switch on printer with Print button (warning lamp in button lights up).
- Switch on ignition.
Indicated on display:
Rapid data transfer HELP
Enter address word XX
- Press buttons -1- and -5- (the address word of the vehicle system to be tested "Airbag" is entered with 15).
Indicated on display:
Rapid data transfer Q
15 Airbag
- Confirm entry with the -Q- button.
Indicated on display:
Rapid data transfer HELP
Select function XX
NOTE:
- 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.
- Ignition must be switched on.
- Malfunctions have occurred at the start of or during the program (external interference?).
- 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.
Indicated in display after entering the address word 15:
and then the following appears in the display:
Rapid data transfer
Tester sends the address word 15
Indicated on display (see parts catalog for latest control module version).
1JO 909 608 D AIRBAG VW 3-S V03 ->
Coding 00068 WSC12345
- Press -> button.
Indicated on display:
Rapid data transfer HELP
Select function XX
List of selectable functions
01 - Check Control Module Version
02 - Check DTC Memory
03 - Output Diagnostic Test Mode
05 - Erase DTC memory
06 - End Output
07 - Code Control Module
08 - Read Measuring
NOTE:
- A list of possible functions is printed out after pressing the HELP button.
- Do not select further functions, which can be printed out after pressing the HELP button.
- After the function is completed the V.A.G 1551 returns to the following start position:
Indicated on display:
Rapid data transfer HELP
Select function XX