2751079 - K18 CITY WARNING LIGHT DOES NOT SWITCH WHEN 'BUTTON IS OPERATED

When the CITY button is pressed repeatedly, the warning light in the button is not activated.
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
2CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner, check, in the Body Computer Node ambient, that there are no errors and that the specific parameter varies.Continue to Step 7Impossible to connect with the Body Computer control unit.Continue to Step 3
Impossible to connect with the Body Computer control unit.Continue according to the instructions for the diagnostic equipment
Impossible to connect with the Body Computer control unit.Continue to Step 6
3ELECTRIC POWER SUPPLY CHECKAll OKProblems metOperation
Check that the Body Computer 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 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 working.Restore damaged electrical connections.
5CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Using the Examiner, check the possibility of connecting with the Body Computer Node. Continue to Step 2Impossible to connect with the Body Computer control unit.Replace the Body Computer Node
6CHECK ON CONNECTIONSAll OKProblems metOperation
Check that the CITY button and the wiring with the Body Computer Node are working properly. See   E7045  ELECTRIC STEERING Continue to Step 7Button faulty Replace faulty component
Electrical wiring not workingRenew the damaged wiring.
7Continue as instructed by the testerAll OKProblems metOperation
Check that the fault is no longer present End of diagnosisThe fault persists.Continue to Step 2