22 · Diagnostics

Horns not working

Make: Lancia
Model: Thesis Factory Service Manual
Year: 2002–2009
Section: RADIO AND ACCESSORIES etc. › Horns not working

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Fault diagnosisHorns not working

HORNS NOT WORKING

STEP	OPERATIONS TO BE CARRIED OUT	TEST RESULTS
1	COMPONENT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the condition of the fuse in the engine compartment junction unit. (Wiring Diagram ) E3010 HORNS	Move on to Step	Fuse faulty	Replace the protective fuse (Wiring Diagram ) E3010 HORNS
2	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check for the output positive from the engine compartment junction unit to the steering column switch unit (Wiring Diagram ) E3010 HORNS	Move on to Step	No positive	Move on to Step
3	COMPONENT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the internal continuity of the engine compartment junction unit between: protective fuse and horn relay feed relay feed and output to steering column switch unit relay feed and output to horns. Check the condition of the relay feed (Wiring Diagram ) E3010 HORNS	Move on to Step	1. Connections inside junction unit broken	1. Replace the engine compartment junction unit See in Op. 5505A13 Additional junction unit in engine compartment - R.R.
		Move on to Step	2. Relay feed faulty	2. Replace the relay feed (Wiring Diagram ) E3010 HORNS
4	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the output earth for the horn from the engine compartment junction unit to the steering column switch unit by pressing the horn contact. (Wiring Diagram ) E3010 HORNS	Move on to Step	No earth	Move on to Step
5	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	check the continuity between engine compartment junction unit and input on steering column switch unit steering column switch unit and connection on steering wheel after the clock spring connection on steering wheel and output to earth from steering column switch unit output from steering column switch unit to centre dashboard earth horn contacts on steering wheel (Wiring Diagram ) E3010 HORNS	Move on to Step	1. No continuity between engine compartment junction unit.	1. Restore the electrical connection (Wiring Diagram ) E3010 HORNS
			2. No continuity between steering wheel connection and steering column switch unit input/output	2. Replace the steering column switch unit/clock spring assembly See in Op. 5550A12 complete stalk unit - r+r for versions with air bag
			3. No continuity between steering column switch unit and centre dashboard earth	3. Restore the electrical connection (Wiring Diagram ) E3010 HORNS
			4. No continuity between horn contacts on steering wheel	4. Replace the steering wheel See in Op. 4110A11 STEERING WHEEL - R.R. for replacement or checks for versions with AIR BAG
6	ELECTRICAL SYSTEM CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check the continuity between: engine compartment junction unit and horns horns and right front earth	Move on to Step	Electrical connection faulty	Restore the electrical connection (Wiring Diagram ) E3010 HORNS
7	COMPONENT CHECK	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	check the condition of the horns	Move on to Step	Horns faulty	Replace the horns. See in Op. 5550B30 Left or right HORN (one) - R.R.
8	CHECK ON CORRECT OPERATION	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the fault is no longer present

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Parts & tools for this job For 2002 Lancia Thesis

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