Note: There is a horn installed in the engine compartment on the left side.
The sound signal plays an important role in ensuring road safety. Therefore, any malfunction in its operation must be identified and eliminated as soon as possible. If the volume of the sound signal has decreased or the tone has changed, there is no need to immediately check its electrical circuit. In this case, most likely, the dirt and reagents that are used to treat the roads have put it out of order.
But if the sound signal has completely stopped working, then most likely the reason is not in the signal itself.
To complete the work you will need an assistant and two pieces of wire about half a meter long (one with a built-in 10A fuse) and a multimeter.
Sequence of execution
1. Prepare the car for work (see "Preparing the car for maintenance and repair").
2. Check the serviceability of fuse F73 10 A and relay K24 in the fuse and relay box in the engine compartment (see "Mounting block - location of fuses and relays").
We replace a faulty relay or a blown fuse. If the fuse blows again, look for a short circuit in the electrical circuit (see "Checking and repairing electrical circuits").
3. If the fuse and relay are in good condition, remove the front bumper trim (see "Front bumper - removal and installation").
4. Disconnect the wiring harness connector from the horn terminals.
5. Check the connector for dirt and oxidation. If necessary, clean it using a special electrical contact cleaner.
6. Connect the probes of the multimeter to the contacts of the connector, switched on in the voltage measurement mode, and measure the voltage with the sound signal switch pressed. The multimeter should show the battery voltage.
If there is no voltage, check the electrical circuit.
7. To check the sound signal for a short circuit, connect one of its terminals to ground, and briefly connect the second piece of wire with a 10 A fuse embedded in it to the positive terminal of the battery.
If the fuse blows, the horn has a short circuit and will need to be replaced. If it runs quietly, it also needs to be replaced.
Recommendation. There is an adjustment screw on the inside of the horn, and you can use a thin-bladed slotted screwdriver to adjust the sound of the horn. If the sound is hoarse and weak, and you cannot achieve an acceptable sound by turning the adjustment screw, the horn must be replaced.
8. Using a 13 mm wrench, unscrew the horn mounting nut and remove it.
9. Install the sound signal in reverse order. After installation, we check the operation of the sound signal.