Seat belt unfastened warning light on
- Make
- Fiat
- Model
- Idea Factory Service Manual
- Year
- 2003–2012
- Section
- Instrument panel › Seat belt unfastened warning light on
Fault diagnosisSeat belt unfastened warning light on
SEAT BELT UNFASTENED WARNING LIGHT ON
The warning light remains on with the driver's seat belt fastened.
The seat belt not fastened warning light is turned on by a command sent via the C-CAN from the Air Bag Node to the Body Computer The latter sends the signal, via the B-CAN, to the Instrument Panel Node.
| Results of the tests | ||||
| 1 | PRELIMINARY CHECKS | All OK | Problems met | Operation |
|---|---|---|---|---|
Connect the EXAMINER diagnostic equipment and check the CAN NETWORK INFORMATION:
| Continue to Step 2 | Presence of faults in the CAN | Continue as instructed by the tester | |
| Impossible to converse with the Body Computer | Continue to Step 8 | |||
| 2 | SWITCH CHECK | All OK | Problems met | Operation |
| Check that the seat belt not fastened warning light switch is working properly | Continue to Step 3 | Switch not working | Replace the lower belt branch Op. 7065A14 | |
| 3 | CHECK WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
| Keeping the diagnostic equipment connected, check that there are no CAN errors at the AIR BAG NODE | Continue to Step 4 | Presence of C-CAN faults | Continue to Step 11 | |
| 4 | CHECK WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
| Using the Examiner check, in the Instrument Panel Node ambient, that there are no errors and the following parameters are present. | Continue to Step 5 | There are errors | Continue in accordance with the instructions for the diagnostic equipment | |
| 5 | ELECTRIC POWER SUPPLY CHECK | All OK | Problems met | Operation |
| Check that the Instrument Panel Node electrical power supply is correct. | Continue to Step 6 | Positive and/or earth electrical power supply fault. | Replace the defective component (if a fuse is involved, search for the cause of the problem). | |
| 6 | CHECK ELECTRICAL CONNECTIONS | All OK | Problems met | Operation |
| Check the electrical connections between the Body Computer and the Instrument Panel, in particular that each individual pin is correctly connected. | Continue to Step 7 | Electrical connections not working. | Restore damaged electrical connection. | |
| 7 | CHECK WITH ACTIVE DIAGNOSIS | All OK | Problems met | Operation |
| With the Examiner in the Instrument Panel Node ambient, check, in active diagnosis, that the seat belts not fastened warning light is correctly activated | Continue to Step 8 | The seat belt warning light is not correctly activated | Replace the instrument panel Op. 5560B11 | |
| 8 | CHECK WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
| Using the Examiner, check, in the Body Computer Node ambient, that there are no errors and that the seat belt status varies | Continue to Step 11 | Impossible to connect with the Body Computer control unit. | Continue to Step 9 | |
| Errors present. | Continue in accordance with the instructions for the diagnostic equipment. | |||
| The parameter values do not change | Continue to Step 11 | |||
| 9 | ELECTRIC POWER SUPPLY CHECK | All OK | Problems met | Operation |
| Check that the Body Computer Node electrical power supply is correct. | Continue to Step 10 | Positive and/or earth electrical power supply fault. | Replace the defective component (if a fuse is involved, search for the cause of the problem). | |
| 10 | CHECK WITH DIAGNOSTIC EQUIPMENT | All OK | Problems met | Operation |
| Using the Examiner, check the possibility of connecting with the Body Computer Node. | Continue to Step 8 | Impossible to connect with the Body Computer control unit. | Replace the Body Computer Op. 5505A32 | |
| 11 | CHECK ON CORRECT OPERATION | All OK | Problems met | Operation |
| Check that the fault is no longer present | End of diagnosis | Fault persists | Replace the Body Computer Op. 5505A32 | |
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