2398844 - K80 AIRBAG FAILURE WARNING LIGHT ON

The Air Bag failure warning light is lit up by a command sent via the C-CAN from the Air Bag Node to the Body Computer. The latter, sends the signal to the Instrument Panel Node via the B-CAN
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation

Connect the EXAMINER diagnostic equipment and check the CAN NETWORK INFORMATION:

  • For inactive control units
  • For control units with errors
  • For control units with CAN errors
Continue to Step 1Presence of faults in the CAN Continue as instructed by the tester
Impossible to converse with the Body ComputerContinue to Step 7
1CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation

Keeping the diagnostic equipment connected, check for the following at the AIR BAG NODE:

  • System/component faults
  • CAN faults
Continue to Step 2System/component fault Continue according to the instructions for the diagnostic equipment
Presence of C-CAN faults Continue to Step 9
2CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner check, in the Instrument Panel Node ambient, that there are no errors and the following parameters are present.Continue to Step 3There are errorsContinue in accordance with the instructions for the diagnostic equipment
3ELECTRIC POWER SUPPLY CHECKAll OKProblems metOperation
Check that the Instrument Panel Node electrical power supply is correct.Continue to Step 4Positive and/or earth electrical power supply fault. Replace the defective component (if a fuse is involved, search for the cause of the problem).
4CHECK ELECTRICAL CONNECTIONSAll OKProblems metOperation
Check the electrical connections between the Body Computer and the Instrument Panel, in particular that each individual pin is correctly connected.Continue to Step 5Electrical connections not working.Restore damaged electrical connection.
5CHECK WITH ACTIVE DIAGNOSISAll OKProblems metOperation
With the Examiner in the Instrument Panel Node ambient, check, in active diagnosis, that the Air Bag warning light is correctly activated Continue to Step 6The Air Bag warning light is not working properlyReplace the instrument panel Op. 5560B11
6CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner, check, in the Body Computer Node ambient, that there are no errors and that the warning light status variesContinue to Step 9Impossible to connect with the Body Computer control unit.Continue to Step 7
Errors present.The parameter values do not change
The parameter values do not changeContinue to Step 9
7ELECTRIC POWER SUPPLY CHECKAll OKProblems metOperation
Check that the Body Computer Node electrical power supply is correct.Continue to Step 8Positive and/or earth electrical power supply fault. Replace the defective component (if a fuse is involved, search for the cause of the problem).
8CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner, check the possibility of connecting with the Body Computer Node. Continue to Step 6Impossible to connect with the Body Computer control unit.Replace the Body Computer Op.   5505A32 
9CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisThe fault persistsReplace the Body Computer Op.   5505A32