22 · Diagnostics

Heater plugs warning light on constantly

Make: Fiat
Model: 500 Factory Service Manual
Year: 2007–2024
Section: Instrument panel › Heater plugs warning light on constantly

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Fault diagnosisHeater plugs warning light on constantly

HEATER PLUGS WARNING LIGHT ON CONSTANTLY

1.3 Multijet

The Engine Management Node sends a message via the C-CAN to the Body Computer, which makes it available via the B-CAN, to the Instrument Panel node.

1	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
		Test results
	Using the Examiner in active diagnosis, check that the heater plugs warning light is working properly	Move on to Step 2	The warning light does not flash	Replace the Instrument Panel Op. 5560B10 CONTROL PANEL - R+R
2	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Connect an Examiner to the engine management control unit and check for the presence of faults	Move on to Step 3	Presence of faults	Continue as instructed by the diagnostic equipment
3	ELECTRICAL POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check that the electrical power supply for the glow heater plugs control unit is correct Check the continuity of the wiring between the glow heater plugs control unit and the engine management control unit Check that the glow heater plugs are working properly	Move on to Step 4	1. Fault in positive electrical supply and/or earth from glow plug preheating control unit 2. Glow heater plugs defective 3. Glow heater plugs control unit defective	1. Restore correct power supply 2. Restore the damaged wiring to correct operation 3. Replace glow heater plugs Op. 5520C10 HEATER PLUGS - R+R 4. Replace glow heater plug control unit Op. 5520C20 HEATER PLUGS CONTROL UNIT - R.R
4	ENGINE CONTROL UNIT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the engine control unit is working properly	End of diagnosis	Engine control unit defective	Replace the engine control unit Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R
4	GLOW HEATER PLUGS SYSTEM CHECK	All OK	Problems encountered	Operation
	Check that the connection between the glow heater plugs control unit and the glow heater plugs is correct Check that the glow heater plugs are working properly.	Move on to Step 5	1. Wiring defective 2. Glow heater plugs defective 3. Glow heater plugs control unit defective	1.Restore the correct wiring. 2.Replace the defective glow heater plugs Op. 5520C10 HEATER PLUGS - R+R 3.Replace the glow heater plugs control unit Op. 5520C20 HEATER PLUGS CONTROL UNIT - R.R
5	ELECTRICAL POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check the node power supply/electrical connections are correct. Check the (network) wiring between Engine Control, Body Computer and Instrument Panel. Check, in particular, that each individual pin is correctly connected to each node.	Move on to Step 6	1. Fault in positive electrical supply and/or earth 2. Electrical connections not operational 3. Engine control unit defective	1. Restore correct power supply 2. Restore correct wiring. 3. Replace the Engine Management Node Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R
6	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Use an Examiner to check the possibility of connection to the Body Computer Node Check that the body computer is working properly.	End of diagnosis	Body Computer defective	Replace Body Computer Op. 5505A32 BODY COMPUTER - R.R

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Parts & tools for this job For 2007 Fiat 500

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