22 · Diagnostics

Heater plugs warning light on constantly

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
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

1.9 JTD 16V

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

1	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Connect the Examiner diagnostic equipment and check for the following at the CAN: Node(s) not activated Node(s) faulty Node(s) with CAN error	Continue to Step 6	Impossible to converse with the Body Computer	Continue to Step 2
			Instrument Panel Node not activated and/or faulty	Continue to Step 5
			Engine Management Node not activated and/or faulty	Continue to Step 8
			Presence of faults in the CAN network	Continue to Step 11
2	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner, check the possibility of connecting with the Body Computer Node, that there are no errors and that the following parameters are present	Continue to Step 1	Impossible to connect with the Body Computer control unit	Continue to Step 3
		Continue to Step 1	There are errors	Continue according to the instructions for the diagnostic equipment
3	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the electrical power supply for the Body Computer Node is correct and that the wiring between the nodes is correct, in particular that each individual pin is correctly connected	Continue to Step 4	Positive and/or earth electrical power supply faulty	Replace the component involved (if a fuse is involved, search for the cause of the problem)
		Continue to Step 4	Electrical connections not working	Restore the correct operation of the wiring
4	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 2	Impossible to connect with the Body Computer	Replace the Body Computer Op. Op. 5505A32 BODY COMPUTER - R R
5	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 8	System fault.	Continue to Step 6
			Presence of faults in the CAN network	Continue to Step 11
			There are errors	Continue according to the instructions for the diagnostic equipment
6	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the node electrical power supply is correct. Check the wiring between the Body Computer and the Instrument Panel, in particular that each individual pin is correctly connected	Continue to Step 7	Positive and/or earth electrical power supply faulty	Replace the component involved (if a fuse is involved, search for the cause of the problem)
		Continue to Step 7	Electrical connections not working	Restore the correct operation of the wiring
7	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 8	Fault persists	Replace the instrument panel Op. Op. 5560B11 ANALOGUE CONTROL PANEL - R+R OR REPLACE
8	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Keeping the diagnostic equipment connected, check for the following at the Engine Management Node: System/component faults Faults on the CAN network(s)	Continue to Step 6	System/components fault	Continue to Step 9
			Presence of faults in the CAN network	Continue to Step 11
			There are errors	Continue as instructed by the tester
9	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the node electrical power supply is correct. Check the wiring between the Body Computer and the NCM, in particular that each individual pin is correctly connected	Continue to Step 10	Positive and/or earth electrical power supply faulty	Replace the component involved (if a fuse is involved, search for the cause of the problem)
		Continue to Step 10	Electrical connections not working	Restore the correct operation of the wiring
10	CHECK WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Using the Examiner check, in the Engine Management Node ambient, that there are no errors and the following parameters are present	Continue to Step 8	Fault persists	Replace the Engine Management Node Op. Op. 1060G80 DS ELECTRIC INJECTION CONTROL UNIT - R R
11	ELECTRIC POWER SUPPLY CHECK	All OK	Problems met	Operation
	Check that the supply / electrical connections of the node(s). Check the (network) wiring between the Engine Management, Body Computer and Instrument Panel, in particular, that each individual pin is correctly connected at each node	Continue to Step 1	Positive and/or earth electrical power supply faulty	Replace the component involved (if a fuse is involved, search for the cause of the problem)
		Continue to Step 1	Electrical connections not working	Restore the correct operation of the wiring
12	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

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Parts & tools for this job For 2003 Alfa Romeo GT

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