Description of On Board Diagnostics

Airbag System (With And Without Side Airbag) On Board Diagnostic (OBD)

General Information

Vehicles Up To 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.

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.
- 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.


CAUTION!
- Wiring must only be checked visually!
- Do not perform an electrical continuity check or circuit analysis!
- Check wire routing only when ignition is switched off!


On Board Diagnostic (OBD) functions

The following functions are possible:
01 - Check Control Module Versions
02 - Check DTC Memory
03 - Output Diagnostic Test Mode (vehicles 1997 > 1998 only) (vehicles 1999 > only)
05 - Erase DTC Memory
06 - End Output
07 - Code Control Module
08 - Read Measuring Value Block


NOTE: Function 03 is only available for vehicles 1997 >.