184000511 - K18 CITY WARNING LIGHT DOES NOT SWITCH WHEN 'BUTTON IS OPERATED

When the CITY button is pressed repeatedly, the warning light in the panel does not switch
Results of the tests
1PRELIMINARY CHECKAll OKProblems metOperation
Press the CITY button repeatedly to check whether the LED in the button changes state.Continue to Step 2The LED in the button does not change state.Continue to Step 6
2CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner, check, in the Body Computer Node ambient, that there are no errors and the CITY button status variesContinue to Step 7Impossible to connect with the Body Computer control unitContinue to Step 3
There are errorsContinue in accordance with the instructions for the diagnostic equipment
The parameter values do not changeContinue to Step 6
3ELECTRIC POWER SUPPLY CHECKAll OKProblems metOperation
Check that the Body Computer Node electrical power supply is correctContinue to Step 4Positive and/or earth electrical power supply faultyReplace the component involved (if a fuse is involved, search for the cause of the problem)
4CHECK ON CONNECTIONSAll OKProblems metOperation
Check the continuity of the wiring between the CITY button and the Body Computer Node See E7045 ELECTRIC STEERING Continue to Step 5Electrical connections not workingRestore damaged electrical connections.
5CHECK WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner, check the possibility of connecting with the Body Computer NodeContinue to Step 2Impossible to connect with the Body Computer control unitReplace the Body Computer Node Op. 5505A32
6CHECK ON CONNECTIONSAll OKProblems metOperation
Check that the CITY button and wiring with the Body Computer Node are working properly See E7045 ELECTRIC STEERING Continue to Step 7Button faultyReplace faulty component
Electrical wiring not workingRenew the damaged wiring.
7CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosisThe fault persistsContinue to Step 2