General description
- Make
- Alfa Romeo
- Model
- 155 Factory Service Manual
- Year
- 1992–1998
- Section
- Horn system › General 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 | |||
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