22 · Diagnostics

Brake light switch error

Make: Fiat
Model: Stilo Factory Service Manual
Year: 2001–2007
Section: Examiner › Brake light switch error

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Fault diagnosisBrake light switch error

BRAKE LIGHT SWITCH ERROR

The diagnostic equipment signals the following error: C1340 Brake Light Switch

This error can be signalled in two groups of cases. The first is when there is an open circuit at the wiring or at the brake lights switch, the brake lights are burnt out or the reading circuit is damaged. In all these cases the voltage read at the brake lights switch is not in the range below 55% (pedal released) or above 75% (pedal pressed) for the battery voltage.

The second group of cases is where there is an open circuit or short circuit (positive or earth) for the wiring or for the brake lights switch, if the switch or the reading circuit is damaged. In all these cases, braking effort is detected without pressure on the brake pedal switch or the closing of the switch contacts.

1	BRAKE PEDAL SWITCH VOLTAGE CHECK	All OK	Problems met	Operation
		Results of the tests
	Check that the voltage values at the brake pedal switch are correct. In particular: The voltage should be less than 55% of the battery voltage is the pedal is released. The voltage should be more than 75% of the battery voltage is the pedal is pressed See E2021 BRAKE LIGHTS	Continue to Step 3	Voltage at brake pedal switch not correct	Continue to Step 2
2	ELECTRICAL CHECKS	All OK	Problems met	Operation
	Check that the electrical connections for the brake light circuit are correct Op. 5550D04. Also check that the brake lights are not burnt out	Continue to Step 3	Wiring faulty	Renew the wiring
			Brake lights burnt out	Replace the burnt out bulb Op. 5540A50
			Third brake light burnt out	Replace the third brake light Op. 5550D16
3	BRAKE PEDAL STATE CHECK	All OK	Problems met	Operation
	Connect the diagnostic equipment and, in the PARAMETERS ambient, check the 'BRAKE PEDAL STATUS parameter. Press the brake pedal and read 'PRESSED. Release the brake pedal and read 'RELEASED	Continue to Step 5	Incorrect reading	Continue to Step 4
4	CHECK ON BRAKE PEDAL SWITCH	All OK	Problems met	Operation
	Check the condition of the brake pedal switch	Continue to Step 5	Switch faulty	Replace the brake pedal switch Op. 5550D10 Continue to Step 3
5	BRAKE PEDAL SWITCH ADJUSTMENT	All OK	Problems met	Operation
	Adjust the brake pedal switch so that with the pedal completely pressed it does not complete the last notch, referring to Service News 3350 E 000 AA N°33 03 02	Continue to Step 7
6	BRACKET DISTANCE CHECK	All OK	Problems met	Operation
	Check that the distance between the bracket securing the switch and the reaction bracket for the push rod is correct	Continue to Step 7	Distance incorrect	Replace the pedal unit. Continue to Step 7
7	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Delete the errors using the diagnostic equipment. Carry out road See Test 3340A ABS intervention checkto make the control unit check whether there are still errors present. Return to the workshop and check that the fault is no longer present using the diagnostic equipment.	End of diagnosis	The fault persists	Continue to Step 6

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Parts & tools for this job For 2001 Fiat Stilo

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