Checking the ignition circuit

Check the plug connections and lines between the following components:
- Airbag control unit
- Gas generator
Disconnect any one of the plug connections between the airbag control unit and gas generator. Use the suitable adapter to measure the resistance of the gas generator.
- Setpoint value of resistance: 1.6 Ohm - 5.6 Ohm
- Setpoint value of resistance: 2.1 Ohm - 5.6 Ohm (driver's airbag stage 1 or stage 2)
If the tests at 1. and 2. return the state OK, replace the airbag control unit.

NOTE:

Short-circuit jumper fitted at connector of gas generator!
Test the resistance using the Tester measurement system, otherwise danger of airbag operation!
For the driver's airbag, the clock spring conductors and the poor contact to the this component are a great source of faults. For this reason, the clock spring conductors must be checked for continuity (simultaneously turning the steering wheel)!
Meaning of firing circuit disconnected: short circuit between the lines from two different ignition circuits.
In the case of sporadic faults in particular (i.e. fault not present at the moment), the fault is the result of poor contact, corrosion or a loose contact of the plug connection!
Use the fault code memory to establish which gas generator is faulty. If, for example, the fault code memory contains "930984 head airbag" it is the gas generator for "head airbag". Consult the wiring diagram for the pin numbers and adapter numbers.

NOTE: All work on the airbag must only be conducted with the battery disconnected! Connect and disconnect control unit, sensors and gas generators only with the battery disconnected! The airbag control unit contains vehicle-specific data and must therefore be encoded before placing into operation! Removal and installation in other vehicles is prohibited!

We can assume no liability for printing errors or inaccuracies in this information and reserve the right to introduce technical modifications at any time.