Seat belt unfastened warning light on
- Make
- Fiat
- Model
- Grande Punto Factory Service Manual
- Year
- 2005–2012
- Section
- Instrument panel › Seat belt unfastened warning light on
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: - no control units inactive; - no faulty control units; - no control units with faulty CAN | Move on to Step 2 | 1. Fault on CAN network 2. Communication impossible with the Body Computer | 1. Continue following the instructions for the diagnostic equipment 2. 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 properly inserted in the floor connection | 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 | Passenger presence sensor replacement 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 network 2. Air bag control unit defective | 1. Move on to Step 11 2. Replace the Air Bag control unit | |
| 6 | 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 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 | CHECK ELECTRICAL CONNECTIONS | 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 | |
| 10 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
| Using the Examiner diagnostic equipment in Body Computer Node mode 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 unit. 2. Presence of errors 3. The parameters do not change | 1. Move on to Step 11 2. Continue by following the instructions on the diagnostic instrument 3. 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 | |
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