Genuine Toyota HORN ASSY HIGH PITCH
Introduction
Replacing your car’s horn can enhance both safety and sound quality. Upgrading to genuine parts, such as the Alphard horns, ensures reliability and improved performance. This guide will walk you through the process of replacing the low side horn (part number 86520-30670) and the high side horn (part number 86510-48190), including the installation of a relay system for optimal functionality.
Required Parts and Tools
Specific Part Numbers
- Low Side Horn: 86520-30670
- High Side Horn: 86510-48190
Tools Needed for the Job
- Socket wrench set
- Screwdrivers (Phillips and flathead)
- Pliers
- Wire cutters/strippers
- Masking tape
Safety Equipment
- Safety goggles
- Gloves
Step-by-Step Installation Process
Bumper Protection and Removal
Before starting, protect your vehicle’s bumper by applying masking tape to prevent scratches. Carefully remove the bumper using the posts of your seniors as a reference for guidance.
Original Horn Removal
Locate the original horn mounted on the passenger side. Use a socket wrench to remove it from its bracket. Disconnect the wiring harness carefully.

New Horn Installation
Install the new Genuine Toyota HORN ASSY HIGH PITCH in the same location as the original. Ensure it is securely mounted and reconnect the wiring harness.
Relay Installation and Wiring
Attach the relay using a tie wrap and double-sided tape for stability. Follow the wiring diagram provided with the relay to connect it properly to the horn and battery.
Reattach the Bumper
Once everything is installed, carefully put the bumper back on. Ensure all clips and screws are secured.

Working with All-Around Camera Systems
If your vehicle is equipped with an all-around camera system, take extra care during bumper removal and reinstallation to avoid damaging the camera sensors.
Relay Benefits and Installation Tips
Installing a relay can enhance the performance of your horn by allowing it to draw more power without overloading the circuit. Ensure that you follow the manufacturer’s wiring instructions.
Troubleshooting Common Issues
If the horn does not sound or is weak, check the wiring connections and ensure the relay is functioning correctly. Consult the relay’s manual for troubleshooting steps.
Results and Performance
After installation, you may notice an improvement in horn volume. Conduct a final test to ensure everything is working correctly. Enjoy the enhanced sound and reliability of your new horns!
If you are interested in purchasing the Genuine Toyota HORN ASSY HIGH PITCH, contact us.
Our team is ready to assist you with any inquiries you may have about our products and services. Don’t hesitate to reach out!
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