Brake lights and third brake light not working

Make: Fiat
Model: Idea Factory Service Manual
Year: 2003–2012
Section: Lights › Brake lights and third brake light not working

‹ Prev Turn signals rh or lh side not working Next › Reversing lights not working

Fault diagnosisBrake lights and third brake light not working

BRAKE LIGHTS AND THIRD BRAKE LIGHT NOT WORKING

The brake lights are activated by the Body Computer Node controlled by the brake switch

0	PRELIMINARY CHECKS	All OK	Problems met	Operation
		Results of the tests
	Turn the ignition ON and press the brake pedal. Check that the brake lights come on with the brake pedal pressed	End of diagnosis	One or two of the brake lights do not come on	Continue to Step 2
		End of diagnosis	All the brake lights remain off	Continue to Step 1
1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
	Connect the Examiner to the diagnostic socket Check: that there are no faults in the Body Computer the operation of the brake lights through active diagnosis	Continue to Step 4	Body Computer faulty	Continue according to the diagnostic equipment instructions
			Some of the bulbs do not come on	Continue to Step 3
			None of the bulbs manages to come on	Continue to Step 2
2	CHECK ON STOP LIGHTS ELECTRICAL CIRCUIT	All OK	Problems met	Operation
	Check, in order: connections between brake pedal and Body Computer; connections between Body Computer and bulbs; bulb earth See E2021 BRAKE LIGHTS	Continue to Step 3	Defective component	Replace the component involved (if a fuse is involved, search for the cause of the problem)
		Continue to Step 3	Connections broken	Restore the connections See E2021 BRAKE LIGHTS
3	CHECK ON INDIVIDUAL LIGHTS	All OK	Problems met	Operation
	Check the condition of the individual defective bulbs and the bulb holder assembly	Continue to Step 4	Side bulb damaged	Change the bulb Op. 5540A50
			Third brake light damaged	Replace the bulb Op. 5550D17
			Rear bulb holder assembly faulty	Replace the bulb holder assembly Op. 5540A44
			Third brake light faulty	Replace the third brake light Op. 5550D16
4	CHECK ON BRAKE PEDAL SWITCH	All OK	Problems met	Operation
	Check that the brake pedal switch is working properly	Continue to Step 5	Switch not working properly	Replace the brake pedal switch Op. 5550D10
5	CHECK ON BODY COMPUTER SUPPLY	All OK	Problems met	Operation
	Check that the Body Computer is supplied correctly	Continue to Step 6	Incorrect supply	Incorrect supply See E2021 BRAKE LIGHTS
6	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

‹ Prev Turn signals rh or lh side not working Next › Reversing lights not working

Parts & tools for this job For 2003 Fiat Idea

Links open Amazon search results in a new tab. As an Amazon Associate I earn from qualifying purchases.