Horn
Marks where to press to sound the horn — usually the steering-wheel centre.
What pressing it does
Pressing the marked area sounds the horn. Hyundai's Tucson manual says it works only when that area is pressed, and not to strike it hard or with a sharp object.
Check your car's manual: makes and models differ in what a button does, which positions a switch has and whether it works with the engine off, and your owner's manual is the authority for your car.
- What it looks like
- A trumpet-shaped horn
- Also labelled
- Horn pad
- Standard
- UN R121 and FMVSS 101
What to check in your car's manual
Exactly which part of the steering-wheel pad sounds the horn on your car.
Where makes differ
FMVSS 101 allows the word 'Horn' instead of the symbol. UN R121 para 5.2.1 does not require the symbol on a horn worked by a narrow ring or a lanyard, and FMVSS 101 S5.4.3 exempts a horn symbol in the centre of the steering-wheel hub from its contrast rule.
Where the regulations list it
| Rule | Row | Function | Must be lit with the headlamps |
|---|---|---|---|
| UN R121 | Table, item 29 “Horn” | Control | No |
| FMVSS 101 | Table 2, “Horn”: symbol or the word “Horn” | Control | — |
UN Regulation No. 121 (01 series), location and identification of hand controls, tell-tales and indicators: Cars (M) and light goods vehicles (N1) approved under the UN 1958 Agreement, which includes the EU, UK and Japan. Paragraph 5.2.1: where fitted, a control listed in the table is identified by the symbol in its column 2; note 2 says the symbols are substantially identical to those of ISO 2575:2004. US Federal Motor Vehicle Safety Standard No. 101, Controls and displays (49 CFR 571.101): Cars, multipurpose passenger vehicles, trucks and buses sold in the US. S5.2.1: a control listed in Table 1 or Table 2 is identified by the symbol in column 2 or the word or abbreviation in column 3. S5.3.1(a): a control marked 'Yes' for illumination must have its identification lit whenever the headlamps are on, except on the floor, console, steering wheel, steering column or windshield header.
Other buttons under “Horn, triangle”
Sources
The symbol is cited to the regulation rows above; what pressing it does is taken from the owner's manual below. Each document was read on the date shown.
- UN R121: UN Regulation No. 121 (01 series) as published in the Official Journal of the EU, L 5, 8 January 2016, pp. 16-19: table 'Symbols, their illumination and colours' checked 2026-09-25
- FMVSS 101: govinfo: 49 CFR 571.101 in the Code of Federal Regulations, 1 October 2025 edition, Table 1 (pp. 329-332) and Table 2 (p. 334) as printed checked 2026-09-25
- Hyundai 2025 Tucson (general market, English web manual): Horn — Press the area marked by the horn symbol; do not strike it. checked 2026-09-25
Written in our own words; the manuals cover their own models only.