Test Point 1

Fault, Fault Codes 04, 05, 20, 21, 36 Test Point 1

Ignition circuit, driver

Possible causes, elimination, notes
1. Remove driver s airbag unit.
2. Attach the special tool 9516 instead of the airbag unit.







3. Clear fault memory.
4. Check whether the fault appears again.
a. If the fault does not appear again, replace the airbag unit.
b. If the fault appears again, disconnect plug connection to the contact unit and attach special tool 9516/1.







5. Clear fault memory.
6. Check whether the fault appears again.
a. If the fault does not appear again, replace the contact unit.
b. If the fault appears again, check the wiring harness for pinches and chafing damage.
c. If no fault is found on the wiring harness, replace the triggering unit.


NOTE: Signal not plausible.

This fault path is checked only during the triggering unit self-test, i.e. updating of the fault during the cyclical tests does not take place. If the fault memory is cleared, the ignition must be switched off, the ignition key removed and the ignition switched on again in order to check the fault path. Only in this way is another self-test carried out.