Description of On Board Diagnostics
Airbag System (With And Without Side Airbag) On Board Diagnostic (OBD)
General Information
Vehicles 1997 Up To 1999: up to VIN 8D XA 200 000
The airbag system includes a driver-side airbag, passenger-side airbag, two front seat belt tensioners, side airbag, driver's side, side airbag, passenger side, and two or three (1998 and on) rear seat belt tensioners. If the specified activation criteria are met during a crash, they are ignited centrally by the airbag control module -J234-.
Regardless of the type of crash or crash intensity, the airbag control module sends a "crash signal" to the central locking control module. This function provides passive security. With the help of the central locking system, it unlocks the doors, opens the rear lid and blocks interior switches when an airbag is triggered. Also, interior lighting is switched on. The "crash signal" can be checked using the Output Diagnostic Test Mode. Scan Tool Testing and Procedures
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 >.