Topdisplay Honda Accord 2018-2021 Radio upgrade，12.3-inch QLED display，OEM controls retained

I Swapped My Honda Accord's Screen for a 12.3" QLED - Here's the Install Walkthrough

A Topdisplay owner's walkthrough for the 2018、2019、2020、2021 Honda Accord (10th generation)

My Accord's factory screen did its job, but it felt dated to me. Once I started using wireless CarPlay in other vehicles, going back to a cable and a smaller display every morning got old fast. So I ordered the Topdisplay 12.3-inch QLED kit built for the 2018-2021 Accord, cleared an afternoon, and did the install myself in the driveway. This walkthrough covers the main steps I followed; the details may vary with your vehicle and kit configuration.

What the Topdisplay Kit Offers

Before the tools come out, here is a short overview of the features to consider:

Feature	What it means in practice
12.3-inch QLED display	A larger display that gives the dashboard a more contemporary look. Visibility depends on ambient light, screen settings and viewing angle.
8-Core CPU touch screen stereo	Hardware intended to support responsive menus, maps and media.
Wireless CarPlay & Android Auto	Wireless phone integration with compatible phones, after setup. Connection behavior can vary by device and software version.
Keep OEM Controls	Designed to retain supported factory controls. Confirm compatibility with your vehicle's trim, original equipment and kit configuration before ordering.

Fitment: Honda Accord, 10th generation, model years 2018、2019、2020、2021. Confirm your specific vehicle configuration before installation.

Four Common Questions Before Installation

Will it damage my original car? The kit is intended to use compatible factory connections rather than require cutting or splicing. However, removing trim and handling wiring can cause damage if done incorrectly. Check the instructions for your exact configuration, keep the original parts, and seek professional help if you are unsure.

Do I need professional tools? A plastic trim pry tool, a socket and a screwdriver were the main tools used in this walkthrough. Your vehicle or kit may require additional tools; check the installation instructions before starting.

Is it hard to install? Patience helps, particularly when releasing plastic clips and keeping track of connectors. Difficulty depends on your experience and vehicle configuration. Use the walkthrough alongside the kit instructions, and consider professional installation if you are unfamiliar with dashboard removal or vehicle wiring.

Will I keep my factory functions? The kit is designed to retain supported OEM controls, but this should not be taken as a guarantee that every factory function is retained on every trim. Confirm the functions supported by your exact kit and test them after installation.

The Installation, Step by Step

The following eight steps summarize the installation walkthrough. Use them as a reference alongside the vehicle and kit instructions, rather than as a substitute for those instructions.

Step 1 - Cut the Power Before Starting

First job of the day: open the hood and disconnect the negative battery terminal following the vehicle's service instructions. Do not assume this immediately removes power from every circuit; observe any specified waiting periods and safety precautions before working on the dashboard.

Step 2 - Remove the Passenger-Side Trim Panel

Use a plastic trim pry tool to carefully release the passenger-side dashboard panel. Work gradually along the edge rather than pulling hard from one spot. Check for fasteners before applying force, as clips and trim can be damaged during removal.

Step 3 - Unplug the Factory Harness

Once the panel is out of the way, locate the factory connector behind it. Release the locking tab carefully and disconnect the plug without pulling on the wires. Note its original position and keep it accessible for the next steps.

Step 4 - Remove the Old Head Unit

With the appropriate fasteners released, carefully withdraw the factory head unit from the center stack. Support it as you remove it, and check for any remaining connections or obstructions rather than forcing it out. Keep the original unit and fasteners together.

Step 5 - Connect the New Harness

Connect the supplied harness to the matching connectors according to the kit's wiring instructions. The yellow connector is part of this walkthrough, but connector colors alone should not be used to identify wiring. Check each connection and any required adapters before moving on; do not assume that one connection completes the wiring for every vehicle configuration.

Step 6 - Set the New 12.3" Screen in Place

Position the new display assembly in the factory screen area, following the kit's mounting instructions. Check alignment and cable clearance before securing it. To me, the larger panel gives the dashboard a more contemporary appearance.

Step 7 - Refit the Trim and the AC Vents

Refit the passenger-side frame and air vent assembly, aligning the clips before pressing them into place. Avoid forcing any part that does not seat correctly. Check that all removed fasteners have been accounted for and that no cables are pinched behind the trim.

Step 8 - Reconnect, Power Up and Test

Reconnect the battery according to the vehicle instructions, then power up the system and complete any required setup. Pair a compatible phone for wireless CarPlay or Android Auto, and test audio, supported factory controls and other relevant functions before driving. For me, this is when the upgrade starts to feel like part of the car.

Final Installation Summary

Topic	My take
Total install time	Allow roughly 1 to 1.5 hours as a planning estimate, with extra time for setup and testing. Actual time depends on experience, vehicle configuration and any troubleshooting.
Difficulty	My subjective rating is around 2 out of 5. Careful panel removal and identifying the correct connectors are important; your experience may differ.
Who it's for	Owners of compatible 2018-2021 Honda Accords who want a larger display and wireless phone integration. Check your existing equipment and kit compatibility first.
How it feels now	To me, the larger QLED panel refreshes the dashboard, while wireless phone integration makes everyday use more convenient. App performance, connectivity and retained factory functions depend on the specific setup.

Would I consider it again? Yes, for the larger display and wireless phone integration. Set aside enough time, confirm compatibility, and keep the original parts if you may want to return to the stock setup. Whether this upgrade is worthwhile depends on your priorities, vehicle configuration and comfort with installation.