Car horns are usually located in the bumper of the front wheel, but some models are installed in the air intake grille. So if you want to find the horn, it is natural to confirm the approximate position first, and then disassemble the corresponding parts. Most speakers are fixed with buckles and screws, and they can be removed after being loosened.

There are generally four pairs of+/-lines on the horn line, which are marked with FR, FL, RR and RL, indicating front right, front left, rear right and rear left respectively.

Judging method of the horn line on the car: generally, it appears in pairs, one is solid color and the other is variegated color, and red, yellow and black are often not used. Such as green/green white stripes, gray/gray black stripes, etc. Connect these two wires instantly with the No.5 battery, and you will hear the crackling sound of a specific speaker. After the speaker cable is connected, adjust the sound field balance of the front, back, left and right of the main unit, and you will know if there is any wrong connection.