Checking Leads and Control Unit

Checking Leads And Control Unit







- Ignition off.
- Disconnect Control unit connector
- Visually check contact pin on control unit.
- Check that the plastic pin is intact. Its function is to isolate the short-circuit plate from the pin when file control unit is connected.
- If the plastic pin is broken, the control unit must be replaced as described in SRS control module.
- Disconnect the special tool 998 8695
- Connect control unit connector.
- Ignition on.

Connect an oscilloscope between passenger airbag 1 and earth.
The oscilloscope should now show a spiked pulse with a period time of approx. 500 ms.
If the value deviates from this, this indicates that the wire is short circuited; replace the cable harness.


NOTE: After this test, diagnostic trouble code SRS-222 is displayed. Ignore this code, which is displayed as a result of the test.


Does the value deviate from this?

Yes - Verification

No - Test complete