Instrument lights / lighting dimmer not working

Fault diagnosisInstrument lights / lighting dimmer not working

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

1	CONTROLS CHECK	All OK	Problems met	Operation
		Results of the tests
	Check that the + / - mode buttons on the Computer left controls panel are working properly: See E2530 INSTRUMENT LIGHTING	Continue to Step 2	Switches faulty	Replace the left control panel Op. 5560B56 Continue to Step 2
2	CHECKING ELECTRICAL CIRCUIT	All OK	Problems met	Operation
	Verify: Connections between left control panel and NQS; Connections between controls panel and junction unit	Continue to Step 3	Connections / supplies not correct	Restore correct connections / supplies: See E2530 INSTRUMENT LIGHTING
3	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect an Examiner to the diagnostic socket Check the operation of the panel light through the active diagnosis of the instrument panel.	Continue to Step 4	Light does not change, instrument panel defective	Replace instrument panel Op. 5560B11
4	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

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