K45 HEATER PLUGS WARNING LIGHT NOT WORKING - Alfa - 156 - eLearn

With the ignition key in the ON position, the heater plugs warning light does not come on and then, after a few moments, it does not go off

1	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socketCarry out the active diagnosis of the heater plugs warning light	Continue to Step 2	Connections not correct	Restore the connections
			Control unit fault	Check and, if necesary, replace the engine management control unit Op. 1060G80
			Lack of dialogue with the control unit	Restore the connection between the engine management control unit and the diagnostic connector See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT
2	HEATER PLUGS WARNING LIGHT ELECTRICAL CIRCUIT CHECK	All OK	Problems met	Operation
	Check, in order: the connection between the speedometer and the engine management control unit the speedometer supply speedometer earth ( See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT ).	Continue to Step 3	Connections broken	Restore the connections
3	SPEEDOMETER CHECK	All OK	Problems met	Operation
	Check the operation of the speedometer: see DESCRIPTION AND OPERATION: 5560 INSTRUMENT PANEL	Continue to Step 4	Instrument not working	Replace the speedometer Op. 5560B02
4	CHECK CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Search for the fault starting from another symptom'