22 · Diagnostics

Heater plugs warning light on constantly

Make: Fiat
Model: Bravo Factory Service Manual
Year: 2007–2014
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 8v, 1.9 JTD 16v

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	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
		Test results
	Connect an Examiner and check on CAN Network Information for the absence of: Inactive node/s Node/s with error/s Node/s with CAN network error/s	Move on to Step 6	Impossible to communicate with the Body Computer	Move on to Step 2
			Instrument Panel Node inactive and/or with error	Move on to Step 5
			Engine Control Node inactive and/or with error	Move on to Step 9
			Fault on CAN network	Move on to Step 13
2	CHECK USING DIAGNOSTIC EQUIPMENT.	All OK	Problems encountered	Operation
	Use an Examiner to check the possibility of connection to the Body Computer Node, the lack of errors and the presenc of parameters	Move on to Step 1	Impossible to connect to the Body Computer control unit	Move on to Step 3
		Move on to Step 1	Presence of errors	Move on to Step 6
3	ELECTRICAL POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check that the power supply to the Body Compute Node is correct and the wiring between the nodes. Check in particular that each individual pin is correctly connected.	Move on to Step 4	Fault in positive electrical supply and/or earth	Replace defective component (in the case of a fuse, find out what caused it to blow)
		Move on to Step 4	Electrical connections not operational	Restore the damaged wiring to correct operation
4	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Use an Examiner to check the possibility of connection to the Body Computer Node	Move on to Step 2	Impossible to connect to the Body Computer	Replace Body Computer Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.
5	CHECK USING DIAGNOSTIC EQUIPMENT.	All OK	Problems encountered	Operation
	Using an Examiner check, in Instrument Panel mode, that there are no errors and that the parameters are present	Move on to Step 8	System fault.	Move on to Step 6
			Fault on CAN network	Move on to Step 13
			Presence of errors	Continue as described by the diagnostic equipment
6	ELECTRICAL POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check the power supply to the node is correct. Check the wiring between the Body Computer and the Instrument Panel. In particular, check that each individual pin is properly connected.	Move on to Step 7	Fault in positive electrical supply and/or earth	Replace defective component (in the case of a fuse, find out what caused it to blow)
		Move on to Step 7	Electrical connections not operational	Restore the damaged wiring to correct operation
7	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Using an Examiner check, in Instrument Panel mode, that there are no errors and that the parameters are present	Move on to Step 8	Fault persists.	Replace the instrument panel Op. 5560B10 CONTROL PANEL - R+R
8	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	With the Examiner in Instrument Panel Node mode, check that the heater plugs warning light is correctly activated in Active Diagnosis.	Move on to Step 9	The heater plugs warning light does not flash	Replace the instrument panel Op. 5560B10 CONTROL PANEL - R+R
9	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Keeping the diagnostic instrument connected, check the Engine Control Node for the absence of: System/component faults Faults in the CAN network/s	Move on to Step 12	System/components faulty	Move on to Step 10
			Fault on CAN network	Move on to Step 13
			Presence of errors	Continue following the instructions given by the diagnostic equipment
10	ELECTRICAL POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check the power supply to the node is correct. Check the wiring between the Body Computer and the NCM. In particular, check that each individual pin is properly connected.	Move on to Step 11	Fault in positive electrical supply and/or earth	Replace defective component (in the case of a fuse, find out what caused it to blow)
		Move on to Step 11	Electrical connections not operational	Restore the damaged wiring to correct operation
11	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Using an Examiner check, in Engine Control Node mode, that there are no errors and that the parameters are present.	Move on to Step 9	Fault persists	Replace the Engine Management Node Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R
12	ACTIVE DIAGNOSIS CHECK	All OK	Problems encountered	Operation
	With the Examiner in Engine Control Node mode, check that the heater plugs warning light is correctly activated in Active Diagnosis.	Move on to Step 6	The heater plugs warning light does not flash	Replace the Engine Management Node Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - R.R
13	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 1	Fault in positive electrical supply and/or earth	Replace defective component (in the case of a fuse, find out what caused it to blow)
		Move on to Step 1	Electrical connections not operational	Restore the damaged wiring to correct operation
14	CORRECT OPERATION CHECK	All OK	Problems encountered	Operation
	Check that the fault is no longer present	End of diagnosis	Fault persists	Move on to Step 1

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Parts & tools for this job For 2007 Fiat Bravo

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