22 · Diagnostics

(side) brake lights not working

Make: Lancia
Model: Ypsilon Factory Service Manual
Year: 2003–2011
Section: Lights › (side) brake lights not working

‹ Prev Brake lights and third brake light not working Next › Centre brake light ("third brake light") not working

Fault diagnosis(side) brake lights not working

(SIDE) BRAKE LIGHTS NOT WORKING

Brake lights do not work The third brake light works normally

The RH and LH brake lights are controlled directly from the Body Computer Node on the basis of information from the Brake Light switch.

1	CHECKING WITH DIAGNOSTIC EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Connect the Examiner to the diagnostic socket Check that there are no faults in the Body Computer	Continue to Step 2	Brake lights faulty.	Check the individual lights. Continue to Step 2
2	CHECK ON INDIVIDUAL LIGHTS	All OK	Problems met	Operation
	Check the condition of the individual bulbs and complete bulb holder assembly	Continue to Step 3	Bulbs damaged/unsuitable	Replace bulbs
		Continue to Step 3	Bulbs damaged/unsuitable	Renew or replace the rear light cluster
3	BRAKE LIGHTS ELECTRICAL CIRCUIT CHECK	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 bulb earth: See E2021 BRAKE LIGHTS	Continue to Step 4	Defective component	Replace the component involved (if a fuse is involved, search for the cause of the problem)
			Connections broken	Restore the connections
			Faulty earth	Restore the earth contact 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
5	CHECKING FACIA CONTROL UNIT	All OK	Problems met	Operation
	Check the continuity of the facia control unit internal circuit See E2021 BRAKE LIGHTS	Continue to Step 6	Facia control unit circuit broken	Change the facia junction unit
6	CHECK ON CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present	End of diagnosis

‹ Prev Brake lights and third brake light not working Next › Centre brake light ("third brake light") not working

Parts & tools for this job For 2003 Lancia Ypsilon

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