22 · Diagnostics

Brake fluid warning light on

Make: Lancia
Model: Thesis Factory Service Manual
Year: 2002–2009
Section: On-board instruments › Brake fluid warning light on

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Fault diagnosisBrake fluid warning light on

BRAKE FLUID WARNING LIGHT ON

The insufficient brake fluid level signal is sent by the special sensor to the Body Computer Node which makes it available via the B-CAN to the Instrument Panel Node. The Instrument Panel Node lights up the warning light and displays the insufficient brake fluid level message; if there is a fault the warning light displays the relevant message.

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
1	PRELIMINARY CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the brake fluid level warning light symbol/message is not present.Check that the electric parking brake is not activatedCheck that the insufficient brake fluid level message is not present	Move on to Step	1. Warning light faulty message	Move on to Step
			2. Insufficient brake fluid message	Move on to Step
			3. parking brake on	3. release the parking brake
2	BRAKE FLUID LEVEL TOP UP	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Top up the brake fluid level and check that the warning light and message are no longer present	Move on to Step	The warning light does not go out	Move on to Step
3	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment to the diagnostic connector and check the following at the Body Computer:in parameters ambient the plausibility of the brake fluid parameter	Move on to Step	parameter not plausible	Move on to Step
4	BRAKE FLUID RESERVOIR SENDER UNIT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the sender unit is working properly	Move on to Step	sender unit not working properly	replace the sender unit
5	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the continuity/insulation of the wiring between the sender unit and the Body Computer (Wiring Diagram ) E4010 INSTRUMENT PANEL	Move on to Step	electrical system open circuit or not insulated	Restore the electrical system (Wiring Diagram ) E4010 INSTRUMENT PANEL
6	CHECK USING DIAGNOSTIC EQUIPMENT	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Connect the Examiner diagnostic equipment to the tester input and check the following at the Instrument Panel Node:in active diagnosis ambient the operation of the brake fluid level warning light	Move on to Step	the warning light is damaged / not flashing	Replace instrument panel See in Op. 5560B11 ANALOGUE CONTROL PANEL - R.R. or Replace
7	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present		Fault persists	Replace body computer See in Op. 5505A32 BODY COMPUTER - R.R.

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Parts & tools for this job For 2002 Lancia Thesis

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