Workshop Manuals Factory service & repair Alfa Romeo
01 Introduction and contents02 Vehicle characteristics and maintenance03 Engine – mechanical (Twin Spark)04 Fuel system (Twin Spark)05 Ignition, starting and charging (Twin Spark)06 Engine cooling (Twin Spark)07 Engine – mechanical (V6)08 Fuel system (V6)09 Ignition, starting and charging (V6)10 Engine cooling (V6)11 Electrical diagnosis – introduction and wiring diagram guide12 Electrical 01 – Power supply13 Electrical 02 – Fusebox14 Electrical 03 – Location of grounds15 Electrical 04 – Sidelights16 Electrical 05 – Main and dipped beam headlights17 Electrical 06 – Headlight alignment adjustment18 Electrical 07 – Rear and front fog lamps19 Electrical 08 – Direction indicators and hazard warning lights20 Electrical 09 – Stop lights21 Electrical 10 – Reversing lights22 Electrical 11 – Day lights23 Electrical 11A – Dim-dip device24 Electrical 12 – Interior lighting25 Electrical 13 – Instrument panel26 Electrical 14 – Check panel27 Electrical 15 – Provision for radio28 Electrical 15A – Radio system29 Electrical 16 – Cigar lighter30 Electrical 17 – Horns31 Electrical 18 – Windscreen wipers and washers, headlight washers32 Electrical 19 – Heated rear window and heated door mirrors33 Electrical 20 – Boot release control34 Electrical 21 – Door locking system35 Electrical 21A – Remote control door locking36 Electrical 21B – Anti-theft device37 Electrical 22 – Front power windows38 Electrical 22A – Front power windows (one-touch version)39 Electrical 23 – Rear power windows40 Electrical 24 – Adjustable heated seats41 Electrical 25 – Sunroof42 Electrical 26 – Heating, ventilation and air conditioning43 Electrical 27 – Starting and charging44 Electrical 28 – Engine cooling fan45 Electrical 29 – Motronic ignition and injection46 Electrical 29A – Alfa Romeo CODE immobiliser47 Electrical 30 – ABS48 Electrical 31 – Controlled damping suspension49 Electrical diagnosis – components key50 Clutch51 Gearbox and differential52 Axle shafts53 Front suspension54 Brakes55 Steering56 Rear suspension57 Wheels and tyres58 Electrical system59 Instrument panel and electronic instruments60 Bodywork61 Doors62 Boot and bonnet63 Interior trim64 External trim65 Heating and ventilation
Alfa Romeo 155 Factory Service Manual (1992-1998)30 · Electrical 17 – Horns
30 · Electrical

General description

Make
Alfa Romeo
Model
155 Factory Service Manual
Year
1992–1998
Section
Horn system › General description
Electrical 17 – HornsGeneral description

GENERAL DESCRIPTION

The vehicle is equipped with an acoustic warning system formed by two horns of different tone, one with a high tone and one with a low tone. The two horns are activated simultaneously. For some versions a simplified system is used with a single horn.

FUNCTIONAL DESCRIPTION

The horns are activated in the traditional way by pressing the button located in the centre of the steering wheel.

For obvious reasons of safety, the horns can be sounded at any moment, even when the ignition key is disengaged.

The horn relay I3, located in fusebox G1, is supplied by battery voltage through fuse F2 (20A), in G1.

The coil of the relay I3 is excited by an ground signal originating from the switch connected to the lever group B68.

In this way the supply is sent from the relay to the horns O2, which are already grounded.

TROUBLESHOOTING TABLE

Malfunction Component Test
O2 I3 B68
Horns not working ● ● ● ● A
Horns working badly (out of tune) ● B

Parts & tools for this job For 1992 Alfa Romeo 155

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