22 · Diagnostics

(side) brake lights not working

Make: Fiat
Model: Doblò Factory Service Manual
Year: 2000–2010
Section: Lights › (side) brake lights not working

‹ Prev Direction indicators / hazard warning lights / not working intermittently Next › Centre brake light ("third brake light") not working

Fault diagnosis(side) brake lights not working

(SIDE) BRAKE LIGHTS NOT WORKING

When the brake pedal is pressed with the ignition ON, the brake lights do not work and this fault is signalled by the 'lights failure' warning light If the brake lights are not working and the check panel does not signal itSee table I30 LIGHTS CHECK NOT WORKING

1	CHECK WITH EXAMINER DIAGNOSTIC INSTRUMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the EXAMINER diagnostic equipment to the diagnostic socket. Check that there are no faults in the Body Computer.	Continue to Step 2	Brake lights error.	Check the condition of the bulbs Continue to Step 2
		Continue to Step 2	Incorrect bulb	Restore the correct connections Continue to Step 3
2	CHECK INDIVIDUAL LIGHTS	All OK	Problems met	Operation
	Check the condition of the individual bulbs and bulb holder assembly	Continue to Step 3	Bulbs damaged	Replace bulbs Op. 5540A50
		Continue to Step 3	Bulb holder assembly faulty	Repair or replace the rear lights cluster Op. 5540A44
3	CHECK BRAKE LIGHTS ELECTRICAL CIRCUIT	All OK	Problems met	Operation
	Check, in order: stop lights fuse connection between dashboard control unit, Body Computer and brake pedal switch; connections between Body Computer and bulbs: See E2021 BRAKE LIGHTS	Continue to Step 4	Component defective	Replace the component involved (if a fuse is involved, search for the cause of the problem)
		Continue to Step 4	Connections broken	Restore the connections See E2021 BRAKE LIGHTS
4	CHECK ON BRAKE PEDAL SWITCH	All OK	Problems met	Operation
	Check that the brake pedal switch is fitted correctly and working See E2021 BRAKE LIGHTS	Continue to Step 5	Switch fastening / adjustment incorrect	Adjust the switch
		Continue to Step 5	Brake pedal switch faulty	Replace the switch Op. 5550D10
5	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Search for the fault starting from another symptom'

‹ Prev Direction indicators / hazard warning lights / not working intermittently Next › Centre brake light ("third brake light") not working

Parts & tools for this job For 2000 Fiat Doblò

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