Brake lights and third brake light not working

Make: Alfa Romeo
Model: GT Factory Service Manual
Year: 2003–2010
Section: Lights › Brake lights and third brake light not working

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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	CHECK 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 instructions for the diagnostic equipment
			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	BRAKE LIGHTS ELECTRICAL CIRCUIT CHECK	All OK	Problems met	Operation
	Check, in order: connections between brake pedal and Body Computer; connections between Body Computer and bulbs bulb earth See 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 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. Op. 5540A50 TAIL-LIGHT BULB (ONE), LH OR RH - REPLACE
			Third brake light damaged	Change the bulb Op. Op. 5550D17 THIRD BRAKE LIGHT - R R
			Right rear bulb holder assembly faulty	Replace the bulb holder assembly Op. Op. 5540A62 RIGHT OUTSIDE REAR LIGHT CLUSTER - R.R.
			Left rear bulb holder assembly faulty	Replace the bulb holder assembly Op. Op. 5540A60 LEFT OUTSIDE REAR LIGHT CLUSTER - R.R.
			Third brake light faulty	Replace the third brake light Op. Op. 5550D16 THIRD STOP LIGHT - R+R
4	BRAKE PEDAL SWITCH CHECK	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	Restore the correct supply See 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	The fault persists	Replace the Body Computer Op. Op. 5505A32 BODY COMPUTER - R R

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Parts & tools for this job For 2003 Alfa Romeo GT

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