K91 Instrument lights light dimmer not working

Fault diagnosisK91 Instrument lights light 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.

NOTA: the side lights are working properly

Step	Test procedure	Result	Action
1	CONTROLS CHECK Check that the buttons in the left control panel are working properly: Wiring diagram E2530 INSTRUMENT LIGHTING	OK	Move onto step 2
1		Switches faulty	Replace the left control panel Op. 5560B56 Move onto step 2
2	CHECK ELECTRICAL CIRCUIT Verify: Connections between left control panel and NQS;	OK	Move onto step 3
2		Connections / supplies not correct	Restore correct connections / supplies : Wiring diagram E2530 INSTRUMENT LIGHTING End of diagnosis
3	CHECK WITH DIAGNOSTIC EQUIPMENT Connect the Examiner to the diagnostic socket. Check the operation of the panel light through the active diagnosis of the instrument panel.	OK	Move onto step 4
3		Light does not change, instrument panel defective	Replace the instrument panel Op. 5560B11 End of diagnosis
4	CORRECT OPERATION CHECK Check that the fault is no longer present	OK	Incorrect selection of diagnostic procedure
4		Fault persists	Incorrect selection of diagnostic procedure

Parts & tools for this job For 2000 Alfa Romeo 147

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