199000859 - K141 MODE BUTTON NOT WORKING

The "Instrument Panel Node" receives information directly from the "Menu Esc", "+" and "-" keys.
Results of the tests
1CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Connect the Examiner diagnostic equipment and check, in Instrument Panel Node mode, that there are no errors and that the parameters are present.Move on to Step 61. Impossible to connect to the NQS2. Presence of errors1. Move on to Step 22. Move on to Step 5
2ELECTRICAL POWER SUPPLY CHECKAll OKProblems encounteredOperation
Check that the electrical power supply for the "Instrument Panel Node" is correct see wiring diagram    See E4010 INSTRUMENT PANEL Move on to Step 3Fault in positive electrical supply and/or earthRenew and/or replace the defective component (in the case of a fuse, find out what caused it to blow).
3CHECK ELECTRICAL CONNECTIONSAll OKProblems encounteredOperation
Check the electrical wiring/connections of the instrument Panel Node and those between node and steering wheel stalk. Check, in particular, that each pin is correctly connected and inserted in its seatMove on to Step 4Electrical wiring and/or connections not workingRestore the damaged electrical wiring and/or connections
4CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Use an Examiner to check the possibility of connection to the Instrument Panel NodeMove on to Step 5Impossible to connect with the control unitReplace the instrument panel    Op. 5560B10 CONTROL PANEL - R+R
5ELECTRICAL CIRCUIT CHECKAll OKProblems encounteredOperation
Check the correct operation of the following components:- Wiring between node and steering wheel stalk- Control keys, see wiring diagram    See E4010 INSTRUMENT PANEL Move on to Step 61. Wiring faulty2. Control panel not working properly1. Repair wiring. 2. Replace the control panel    Op. 7040A82 SWITCH UNIT ON LEFT SIDE OF DASHBOARD - R.R.
6CHECK ON CORRECT OPERATIONAll OKProblems encounteredOperation
Check that the fault is no longer presentEnd of diagnosisThe fault persistsContact technical service for further information on the problem