198001846 - K073 SEAT BELT UNFASTENED WARNING LIGHT ON

The warning light remains on even when the driver''s seat belt is fastened.If one the passenger''s seat belts is not fastened, the warning light will remain on.

The seat belt not fastened 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.

		Test results
1	PRELIMINARY CHECKS	All OK	Problems encountered	Operation
	Connect an EXAMINER and check the following on CAN NETWORK INFORMATION:- that there are no inactive control units;- that there are no faulty control units;- no control units with faulty CAN	Move on to Step 2	1. Fault on CAN network2. Communication with the Body Computer impossible.	1. Continue following the instructions given by the diagnostic equipment2. Move on to Step 7
2	SWITCH CHECK	All OK	Problems encountered	Operation
	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. 7065A14 ANCHORAGE ROD FOR , (ONE), FRONT SEAT BELT LEFT OR RIGHT - R.R.
3	PASSENGER PRESENCE SENSOR CONNECTIONS CHECK	All OK	Problems encountered	Operation
	Check that the seat connection is correctly inserted in the connection on the floor	Move on to Step 4	Passenger presence sensor connector detached from the connection on the vehicle floor	Fit the seat connector correctly with the vehicle floor connector
4	WIRING BREAK CHECK	All OK	Problems encountered	Operation
	Check for any breaks/tears in the wiring/device using the specific tester	Move on to Step 5	Presence of cuts/tears in the connecting cables and break in the printed circuit	Replacement of the passenger presence sensor    Op. 7065A34 PASSENGER PRESENCE SENSOR ON FRONT SEAT FOR INDICATING SEATBELT UNFASTENED R R
5	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Keep the diagnostic tester connected and check for CAN faults in the AIR BAG NODE	Move on to Step 6	1. Fault on B-CAN network2. Air bag control unit defective	1. Move on to Step 112. Replace the Air Bag control unit    Op. 5580C14 AIR BAG ECU - R+R
6	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Using the Examiner in the Instrument Panel Node mode, check that there are no errors and that the parameters are present	Move on to Step 7	Presence of errors	Continue following the instructions on the diagnostic instrument
7	ELECTRICAL POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check the electricity supply to the Instrument Panel Node is correct.	Move on to Step 8	Fault in positive electrical supply and/or earth	Replace defective component (in the case of a fuse, find out what caused it to blow)
8	ELECTRICAL CONNECTIONS CHECK	All OK	Problems encountered	Operation
	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 9	Electrical connections not operational	Renew the damaged electrical connections
9	ACTIVE DIAGNOSIS CHECK	All OK	Problems encountered	Operation
	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 10	The seat belt warning light does not come on correctly	Replace the Instrument Panel    Op. 5560B10 CONTROL PANEL - R+R
10	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Using the Examiner in Body Computer Node mode check that there are no errors and that the seat belt status has changed	End of diagnosis	1. Impossible to connect to the Body Computer control unit2. Presence of errors3. The parameters do not change	1. Move on to Step 112. Continue by following the instructions on the diagnostic instrument3. Move on to Step 11
11	ELECTRICAL POWER SUPPLY CHECK	All OK	Problems encountered	Operation
	Check the electricity supply to the Body Computer Node is correct	Move on to Step 12	Fault in positive electrical supply and/or earth	Replace defective component (in the case of a fuse, find out what caused it to blow)
12	CHECK USING DIAGNOSTIC EQUIPMENT	All OK	Problems encountered	Operation
	Use an Examiner to check the possibility of connection to the Body Computer Node	End of diagnosis	Impossible to connect to the Body Computer control unit	Replace Body Computer    Op. 5505A35 MAIN BODY COMPUTER/JUNCTION UNIT - R.R.