2398848 - 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
1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner check, in the Instrument Panel Node ambient, that there are no errors and the following parameters are present.	Continue to Step 5	Impossible to connect with the Instrument Panel control unit.	Continue to Step 2
			There are errors	Continue in accordance with the instructions for the diagnostic equipment
2	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the Instrument Panel Node electrical power supply is correct.	Continue to Step 3	Positive and/or earth electrical power supply faulty	Replace the component involved (if a fuse is involved, search for the cause of the problem)
3	CHECK ELECTRICAL CONNECTIONS	All OK	Problems met	Operation
	Check the electrical connections between the Body Computer and the Instrument Panel, in particular that each individual pin is correctly connected See   E4010  INSTRUMENT PANEL	Continue to Step 4	Electrical connections not working	Restore damaged electrical connections.
4	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner, check whether it is possible to connect with the Instrument Panel Node.	Continue to Step 6	Impossible to connect with the Instrument Panel control unit.	Replace the instrument panel Op. 5560B11
5	CHECK WITH ACTIVE DIAGNOSIS	All OK	Problems met	Operation
	With the Examiner in the Instrument Panel Node ambient, check, in active diagnosis, that the panel lighting is correctly activated	Continue to Step 6	The panel lighting is not activated	Replace the instrument panel Op. 5560B11
6	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner, check, in the Body Computer Node ambient, that there are no errors and the lighting parameter varies	Continue to Step 1	Impossible to connect with the Body Computer control unit	Continue to Step 7
			There are errors	Continue in accordance with the instructions for the diagnostic equipment
			The parameter values do not change	Continue to Step 10
7	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the Body Computer Node electrical power supply is correct	Continue to Step 8	Positive and/or earth electrical power supply fault.	Replace the defective component (if a fuse is involved, search for the cause of the problem).
8	CHECK ON CONNECTIONS	All OK	Problems met	Operation
	Check the continuity of the wiring between the control panel and the Body Computer Node See   E4010  INSTRUMENT PANEL Also check that the MODE +/- buttons are working properly	Continue to Step 9	Electrical connections not working	Restore damaged electrical connections. See   E4010  INSTRUMENT PANEL
			Buttons faulty	Replace the control panel Op.   7040A56
9	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner, check the possibility of connecting with the Body Computer Node	Continue to Step 6	Impossible to connect with the Body Computer control unit	Replace the Body Computer Node Op.   5505A32
10	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	The fault persists.	Continue to Step 1