22 · Diagnostics

Reversing lights not working

Make: Fiat
Model: Stilo Factory Service Manual
Year: 2001–2007
Section: Lights › Reversing lights not working

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

Fault diagnosisReversing lights not working

REVERSING LIGHTS NOT WORKING

Reversing fuse on facia control unit also supplies headlamp washer relay and odour sensor (if present). The reversing lights are operated directly by the switch on the gearbox connected to the positive line. The positive signal also passes through the body computer and goes to the steering column switch unit for the automatic operation of the rearscreen wiper and is sent to the C-Can and B-Can networks to indicate the engagement of reverse gear to the selespeed control unit which controls the buzzer and to the steering setting node for the adjustment of the external rear view mirrors.

1	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
		Results of the tests
	Check the condition of the system protective fuse	Continue to Step 2	Fuse broken	Replace fuse See E2022 REVERSING LIGHTS; Check for short circuits Continue to Step 4
2	CHECKING REVERSING LIGHT SWITCH	All OK	Problems met	Operation
	Check reversing light switch operation See E2022 REVERSING LIGHTS	Continue to Step 3	Switch faulty	Replace switch Op. 5550D22
3	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Disconnect the terminal concerned from the dashboard control unit and check that there is continuity between the cable coming from the engine compartment control unit and the cable coming from the brake switch when reverse gear is engaged. Check the insulation to earth for the entire circuit See E2022 REVERSING LIGHTS	Continue to Step 8	Circuit with o.c. or s.c.	Continue to Step 4
4	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Check the continuity and the insulation of the wires between the facia control unit and the engine compartment control unit See E2022 REVERSING LIGHTS	Continue to Step 5	Wiring in s.c. or o.c.	Renew the wiring See E2022 REVERSING LIGHTS
5	CHECKING ENGINE BAY CONTROL UNIT	All OK	Problems met	Operation
	Check the continuity and the insulation of the engine bay control unit internal circuit. See E2022 REVERSING LIGHTS	Continue to Step 6	Circuit with o.c. or s.c.	Change engine bay control unit Op. 5505A13
6	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Check the continuity and the insulation of the wires between the engine compartment control unit and the reverse switch connection See E2022 REVERSING LIGHTS	Continue to Step 7	Wiring in s.c. or o.c.	Renew the wiring See E2022 REVERSING LIGHTS
7	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Check the continuity and the insulation of the wires between the reverse gear switch and the dashboard control unit See E2022 REVERSING LIGHTS	Continue to Step 8	Wiring in s.c. or o.c.	Renew the wiring See E2022 REVERSING LIGHTS
8	CHECKING ELECTRICAL EQUIPMENT	All OK	Problems met	Operation
	Check the continuity and the insulation of the wires between the facia control unit and the RH and LH reversing lights. See E2022 REVERSING LIGHTS	Continue to Step 9	Wiring in s.c. or o.c.	Renew the wiring See E2022 REVERSING LIGHTS
9	CHECKING FACIA CONTROL UNIT	All OK	Problems met	Operation
	Check the continuity and the insulation of the facia control unit internal circuit. See E2022 REVERSING LIGHTS	Continue to Step 10	Circuit with o.c. or s.c.	Replace facia control unit Op. 5505A10
10	CHECKING BULBS	All OK	Problems met	Operation
	Check bulb efficiency (also for internal short circuits)	Continue to Step 11	Bulbs defective	Change reversing light bulbs Op. 5550D26
11	CHECK CORRECT OPERATION	All OK	Problems met	Operation
	Check that the fault is no longer present		Fault persists	Change reversing lights Op. 5550D24 Search for the fault starting from another symptom'

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

Parts & tools for this job For 2001 Fiat Stilo

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