199000852 - K091 INSTRUMENT LIGHTS DIMMER NOT WORKING

With the ignition ON and the side lights on, the instrument panel lights up, but when the lighting controls are operated it remains on constantly
the side lights work properly
Results of the tests
1CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Using an Examiner check, in Instrument Panel mode, that there are no errors and that the parameters are present.Move on to Step 51. Impossible to connect with the Instrument Panel control unit2. Presence of errors1. Move on to Step 22. Continue following the instructions on the diagnostic instrument
2ELECTRICAL POWER SUPPLY CHECKAll OKProblems encounteredOperation
Check the electricity supply to the Instrument Panel Node is correct.Move on to Step 3Fault in positive electrical supply and/or earthReplace defective component (in the case of a fuse, find out what caused it to blow).
3CHECK ELECTRICAL CONNECTIONSAll OKProblems encounteredOperation
Check the wiring between the Body Computer and the Instrument Panel. In particular, check that each individual pin is properly connected see Wiring Diagram    See E4010 INSTRUMENT PANEL Move on to Step 4Electrical connections not operationalRenew the damaged electrical connections
4CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Use an Examiner to check the possibility of connection to the Instrument Panel NodeMove on to Step 6Impossible to connect with the Instrument Panel control unitReplace the Instrument Panel    Op. 5560B10 CONTROL PANEL - R+R
5ACTIVE DIAGNOSIS CHECKAll OKProblems encounteredOperation
With the Examiner in Instrument Panel Node mode, check that the instrument panel light is correctly activated in Active Diagnosis.Move on to Step 6The panel lighting is not activatedReplace the Instrument Panel    Op. 5560B10 CONTROL PANEL - R+R
6CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Using the Examiner check, in the Body Computer ambient, that there are no errors and that the lighting parameter variesEnd of diagnosis1. Impossible to connect to the Body Computer control unit.2. Presence of errors3. The parameters do not change1. Move on to Step 72. Continue following the instructions on the diagnostic instrument3. Move on to Step 10
7ELECTRICAL POWER SUPPLY CHECKAll OKProblems encounteredOperation
Check the electricity supply to the Body Computer Node is correct.Move on to Step 8Fault in positive electrical supply and/or earthReplace defective component (in the case of a fuse, find out what caused it to blow).
8CONNECTIONS CHECKAll OKProblems encounteredOperation
Check the continuity of the wiring between the control panel and the Body Computer Node    See E4010 INSTRUMENT PANEL Also check that the Menu +/- buttons are working properlyMove on to Step 91. Electrical connections not operational2. Buttons faulty1. Renew the damaged electrical connections2. Replace the control panel    Op. 7040A82 SWITCH UNIT ON LEFT SIDE OF DASHBOARD - R.R.
9CHECK USING DIAGNOSTIC EQUIPMENTAll OKProblems encounteredOperation
Use an Examiner to check the possibility of connection to the Body Computer NodeMove on to Step 10Impossible to connect to the Body Computer control unit.Replace the Body Computer Node    Op. 5505A32 BODY COMPUTER - R.R
10CHECK 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