Air bag failure warning light on
- Make
- Fiat
- Model
- 500 Factory Service Manual
- Year
- 2007–2024
- Section
- Instrument panel › Air bag failure warning light on
AIR BAG FAILURE WARNING LIGHT ON
The brake fluid warning light remains on with the handbrake released.
N.B: The (negative) brake fluid level signal is sent by the sensor to the Body Computer Node which makes it available via theB-CAN to the Instrument Panel Node.
The Instrument Panel Node lights up the dedicated warning light and displays the insufficient brake fluid level message; if the warning light is faulty, the appropriate message is displayed.
| Test results | ||||
| 1 | BRAKE FLUID LEVEL CHECK | All OK | Problems encountered | Operation |
|---|---|---|---|---|
Check that the brake fluid level is not low Top up the brake fluid level and check that the warning light goes out | End of diagnosis | The warning light does not go out | Move on to Step 2 | |
| 2 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
| Connect the Examiner diagnostic equipment and check the operation of the brake fluid level warning light in active diagnosis at the Instrument Panel Node | Move on to Step 3 | The warning light does not flash | Replace the instrument panel | |
| 3 | ELECTRICAL SYSTEM CHECK | All OK | Problems encountered | Operation |
| Disconnect the connector from the oil level sensor and check that it is working properly | Move on to Step 4 | Brake fluid level sensor defective | Replace the sensor Op. 3330A30 DEVICE SIGNALLING BRAKE FLUID LEVEL - CHECK DEVICE ON TANK - INCLUDES REPLACING CAP AND TOPPING UP LEVEL, IF NECESSARY | |
| 4 | ELECTRICAL SYSTEM CHECK | All OK | Problems encountered | Operation |
Check the insulation of the sensor cable | Move on to Step 5 | Cable short circuited | Restore the correct insulation. | |
| 5 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
| Check that the body computer is working properly. | End of diagnosis | Body Computer defective | Replace the Body Computer | |
When starting, the Air Bag warning light comes on and stays on for longer than 4 seconds (the warning light should go off after the initial control unit test)
The warning light will stay on if an impact of a certain severity activates the system. The control unit must be replaced because its memory cannot be cleared
The Air Bag warning light is the smart type with a control circuit inside the panel that ensures the warning light is properly connected to the control unit.
| Test results | ||||
| 1 | CHECK USING DIAGNOSTIC EQUIPMENT | All OK | Problems encountered | Operation |
|---|---|---|---|---|
Connect the diagnostic equipment (Examiner or other instruments) to the diagnostic socket. Check:
| Move on to Step 2 | 1. No communication with the control unit 2. Error detected in the control unit | 1. Restore: a) connection between the Air Bag control unit and diagnostic connector; b) Air Bag control unit power supply 2. Continue following the instructions on the diagnostic equipment | |
| 2 | AIR BAG WARNING LIGHT OPERATION CHECK | All OK | Problems encountered | Operation |
| Use the diagnostic equipment in Air Bag control unit mode to carry out active diagnosis on the Air Bag warning light. | Move on to Step 3 | The warning light does not flash | Replace the instrument panel | |
| 3 | WIRING CHECK | All OK | Problems encountered | Operation |
Check the connection between the Air Bag control unit and the CAN. | End of diagnosis | 1. Connections not correct 2. Air Bag control unit defective | 1. Restore the correct connections. 2. Replace the Air Bag control unit | |
Parts & tools for this job For 2007 Fiat 500
- TOOLOBD2 scanner with SRSSearch: OBD2 scanner ABS SRS
- TOOLTrim removal tool kitSearch: trim removal tool kit
Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.