22 · Diagnostics

Seat belt unfastened warning light on

Make: Fiat
Model: Croma Factory Service Manual
Year: 2005–2010
Section: Instrument panel › Seat belt unfastened warning light on

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Fault diagnosisSeat belt unfastened warning light on

SEAT BELT UNFASTENED WARNING LIGHT ON

With the driver''s seat belt fastened, the warning light remains on.

N.B.: The safety belt unfastened warning light is turned on by a command sent via the B-CAN from the "Air Bag Node" to the Body Computer. The latter sends the signal, via the B-CAN, to the Instrument Panel Node.

1	PRELIMINARY CHECKS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the EXAMINER diagnostic tester and check on CAN NETWORK INFORMATION: No control units inactive No faulty control units No control units with faulty CAN line;	Move on to Step 2	1. Fault on CAN network	1. Continue following the instructions for the diagnostic equipment
		Move on to Step 2	2. Impossible to communicate with the Body Computer	2. Move on to Step 8
2	SWITCH CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the correct operation of the seat belt unfastened warning light switch	Move on to Step 3	Switch not operating	Replace the lower branch of the belt Op. 7065A24 ANCHORAGE LINK WITH PRETENSIONER FOR ONE FRONT SEAT BELT LH OR RH R R
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Keep the diagnostic tester connected and check for CAN network faults in the AIR BAG NODE	Move on to Step 4	1. Fault in B-CAN network	1.Move on to Step 9
		Move on to Step 4	2. Airbag control unit defective	2. Replace the Air Bag control unit Op. 5580C14 AIR BAG ECU - R+R
4	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using the Examiner diagnostic equipment in Instrument Panel Node mode, check that there are no errors and that the parameters are present.	Move on to Step 5	Presence of errors	Continue following the instructions on the diagnostic tester
5	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the Instrument panel node electrical supply is correct.	Move on to Step 6	Fault in electrical supply positive and/or earth.	Replace defective component (in the case of a fuse, find out what caused it to blow).
6	CHECK ELECTRICAL CONNECTIONS	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the electrical connections between the Body Computer and Instrument Panel, in particular that each individual pin is correctly connected.	Move on to Step 7	Electrical connections not operational.	Renew the damaged electrical connections
7	ACTIVE DIAGNOSIS CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	With the Examiner in Instrument Panel Node mode check that the seat belt unfastened warning light is correctly activated in Active Diagnosis.	Move on to Step 8	The seat belt warning light does not come on correctly	Replace the instrument panel Op. 5560B10 CONTROL PANEL - R+R
8	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Using the Examiner diagnostic equipment in Body Computer Node mode that there are no errors and that the seat belt status has changed.	Move on to Step 11	1. Impossible to connect to the Body Computer control unit.	1. Move on to Step 9
			2. Presence of errors.	2. Continue following the instructions on the diagnostic tester
			3. The parameter values do not change	3. Move on to Step 11
9	ELECTRICAL POWER SUPPLY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the Body Computer Node electrical supply is correct.	Move on to Step 10	Fault in electrical supply positive and/or earth.	Replace defective component (in the case of a fuse, find out what caused it to blow).
10	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Use the Examiner to check the possibility of connection to the Body Computer Node.	Move on to Step 11	Impossible to connect to the Body Computer control unit.	Replace Body Computer Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.
11	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present	End of diagnosis	The fault persists	Replace Body Computer Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.

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Parts & tools for this job For 2005 Fiat Croma

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