3022667 - K91 INSTRUMENT LIGHTS / LIGHTING DIMMER NOT WORKING

With the ignition ON and the side lights on, the instrument lights up, but the brightness remains constant when the controls are adjusted.
the side lights are working properly
Results of the tests
1CONTROLS CHECKAll OKProblems metOperation
Check that the + / - mode buttons on the Computer left controls panel are working properly: See   E2530  INSTRUMENT LIGHTING Continue to Step 2Switches faultyReplace the left control panel Op.   5560B56  Continue to Step 2
2CHECKING ELECTRICAL CIRCUITAll OKProblems metOperation

Verify:

  • Connections between left control panel and NQS;
  • Connections between controls panel and junction unit
Continue to Step 3Connections / supplies not correctRestore correct connections / supplies: See   E2530  INSTRUMENT LIGHTING
3CHECKING WITH DIAGNOSTIC EQUIPMENTAll OKProblems metOperation
Connect an Examiner to the diagnostic socketCheck the operation of the panel light through the active diagnosis of the instrument panel.Continue to Step 4Light does not change, instrument panel defectiveReplace instrument panel Op.   5560B11 
4CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentFault persistsSearch for the fault starting from another symptom'