939005133 - K124 HEATER PLUGS WARNING LIGHT ON CONSTANTLY

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

1	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic instrument and check 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 2	1. Impossible to communicate with the Body Computer	1. Move on to Step 2
			2. Instrument Panel Node inactive and/or with error	2. Move on to Step 5
			3. Engine Control Node inactive and/or incorrect	3. Move on to Step 9
			4. Fault on CAN network	4. Move on to Step 13
2	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Use an Examiner to asses the possibility of connection to the Body Computer Node, the lack of errors and the presence of parameters.	Move on to Step 3	1. Impossible to connect to the Body Computer control unit.	1. Move on to Step 3
			2. Presence of errors	2. Continue as described by the diagnostic equipment
3	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the power supply to the Body Compute Node and the wiring between the nodes are correct . Check in particular that each individual pin is correctly connected.	Move on to Step 4	1. Fault in positive electrical supply and/or earth	1. Replace defective component (in the case of a fuse, find out what caused it to blow).
			2. Electrical connections not operational	2. Restore the damaged wiring to correct operation.
4	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Use an Examiner to check the possibility of connection to the Body Computer Node	Move on to Step 5	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	ACTION
	Using an Examiner check, in Instrument Panel mode, that there are no errors and that the parameters are present.	Move on to Step 8	1. System fault	1. Move on to Step 6
			2. Fault on CAN network	2. Move on to Step 13
			3. Presence of errors	3. Continue as described by the diagnostic equipment
6	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the electricity 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	1. Fault in positive electrical supply and/or earth	1. Replace defective component (in the case of a fuse, find out what caused it to blow).
			2. Electrical connections not operational	2. Restore the damaged wiring to correct operation.
7	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	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	ACTIVE DIAGNOSIS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	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	ACTION
	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 10	1. System/components faulty	1. Move on to Step 10
			2. Fault on CAN network	2. Move on to Step 13
			3. Presence of errors	3. Continue following the instructions for the diagnostic equipment
10	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the electricity 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	1. Fault in positive electrical supply and/or earth	1. Replace defective component (in the case of a fuse, find out what caused it to blow).
			2. Electrical connections not operational	2. Restore the damaged wiring to correct operation.
11	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using an Examiner check, in Engine Control Node mode, that there are no errors and that the parameters are present.	Move on to Step 12	Fault persists.	Replace the Engine Management Control Unit    Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R
12	ACTIVE DIAGNOSIS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	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 13	The heater plugs warning light does not flash	Replace the Engine Management Control Unit    Op. 1060G80 DIESEL ELECTRONIC INJECTION CONTROL UNIT - .R
13	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the node power supply/electrical connection/s are correct.Check the wiring (network) between the Engine Management, Body Computer and the Instrument Panel. In particular, check that each individual pin is properly connected on each node.	Move on to Step 14	1. Fault in positive electrical supply and/or earth	1. Replace defective component (in the case of a fuse, find out what caused it to blow).
			2. Electrical connections not operational	2. Restore the damaged wiring to correct operation.
14	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present	End of diagnosis