22 · Diagnostics

Airbag failure warning light on

Make: Fiat
Model: Stilo Factory Service Manual
Year: 2001–2007
Section: Instrument panel › Airbag failure warning light on

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Fault diagnosisAirbag failure warning light on

AIRBAG FAILURE WARNING LIGHT ON

The brake fluid warning light remains on with the handbrake not applied.

The (negative) brake fluid level signal is sent by the special sensor (N.C. with maximum brake fluid level) to the Body Computer Node which makes it available via the B-CAN network 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 relevant message is displayed.

1	PRELIMINARY CHECK	All OK	Problems met	Operation
		Results of the tests
	Check that the brake fluid/VDC level warning light failure message is not present. Check that the insufficient brake fluid level message is not present	Continue to Step 6	Insufficient brake fluid message present	Continue to Step 7
		Continue to Step 6	Insufficient brake fluid message present	Continue to Step 2
2	TOP UP BRAKE FLUID LEVEL	All OK	Problems met	Operation
	Top up the brake fluid level and check that the warning light and the message are not longer present	Continue to Step 9	The warning light does not go off	Continue to Step 3
3	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Disconnect the connector from the fluid level sensor and, using a multimeter, check the efficiency of the connection to earth See E4010 INSTRUMENT PANEL	Continue to Step 4	Faulty earth	Restore earth connection efficiency See E4010 INSTRUMENT PANEL
4	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Bridge the cables at the connector and check that the warning light in the instrument panel is not on and the message is no longer present See E4010 INSTRUMENT PANEL	Continue to Step 9	Warning light on and message present	Continue to Step 5
5	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Check the continuity of the cable from the connector to the Body computer See E4010 INSTRUMENT PANEL	Continue to Step 7	Cable broken	Restore the connection See E4010 INSTRUMENT PANEL
6	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner and check the plausibility, at the Body Computer Node, of the handbrake applied parameter	Continue to Step 7	The parameter is not plausible	Continue as instructed in the Table See table K69 PARKING BRAKE ON WARNING LIGHT
7	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner or keep it connected and check the following at the Instrument Panel Node: the operation of the brake fluid level warning light through active diagnosis	Continue to Step 8	The warning light is damaged / not flashing	Replace instrument panel Op. 5560B11
8	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Keeping the Examiner connected, check the plausibility of the brake fluid level parameter at the Body Computer Node	Continue to Step 9	The parameter is not plausible	Replace the Body Computer Op. 5505A32
9	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		The fault persists	Replace the brake fluid reservoir and sensor. Search for the fault starting from another symptom'

The airbag fault warning light is controlled directly by a dedicated connection to the Instrument Panel Node from the Air Bag control unit

1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the tester, check the airbag control unit for: system/component faults, errors in the body computer	Continue to Step 2	System/component fault	Continue according to the instructions for the diagnostic equipment
2	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Check the continuity and the insulation of the fault warning light control lead from airbag control unit to instrument panel See E4010 INSTRUMENT PANEL	Continue to Step 3	Wires in o.c. or s.c.	Renew the wiring See E4010 INSTRUMENT PANEL
3	CHECKING CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Change airbag control unit Op. 5580C14 Search for the fault starting from another symptom'

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Parts & tools for this job For 2001 Fiat Stilo

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