How to Install Keyless Entry on Your Car: A Comprehensive Step-by-Step Guide

how to install keyless entry on car

Upgrading your vehicle with a keyless entry system offers enhanced convenience and security, making it a popular choice for many car owners. This guide provides a detailed step-by-step process on how to install a keyless entry system in your car, covering everything from the necessary tools and materials to detailed installation instructions.

Why Install Keyless Entry?


A keyless entry system allows you to lock and unlock your car remotely, which is especially useful when your hands are full or when you’re in a hurry.


Modern keyless entry systems enhance your vehicle’s security by offering encrypted signals and additional features such as ignition disablement, which reduces the risk of theft.

Value Addition

Installing a keyless entry system can also add value to your car, making it more appealing to potential buyers.

Tools and Materials Needed

Before you begin the installation, gather the following tools and materials:

  • Keyless entry system kit
  • Wire strippers
  • Electrical tape
  • Screwdrivers (flathead and Phillips)
  • Pliers
  • Soldering iron and solder (optional)
  • Multimeter
  • Zip ties
  • Owner’s manual for your car (for wiring diagrams)


1. Choose the Right Keyless Entry System

Select a keyless entry system that is compatible with your vehicle. Most systems are universal, but it’s crucial to verify compatibility to ensure proper functionality.

2. Read the Instructions

Carefully read the installation instructions provided with your keyless entry kit. Each system may have specific requirements and wiring diagrams.

3. Disconnect the Battery

To avoid electrical shorts and potential injury, disconnect the negative terminal of your car battery before starting the installation.

Installation Steps

4. Locate the Control Module

Find a suitable location for the keyless entry control module inside your car. Common locations include under the dashboard, behind the glove box, or near the steering column. Ensure the module is securely mounted and away from moving parts.

5. Access the Wiring

Remove any panels or covers necessary to access the wiring harnesses in your car. Refer to your car’s owner’s manual to identify the correct wires.

6. Identify Key Wires

Using the wiring diagram provided with your keyless entry system and your car’s manual, identify the wires needed for the following functions:

  • Power (12V constant)
  • Ground
  • Ignition
  • Lock
  • Unlock
  • Trunk release (if applicable)
  • Parking lights (optional)

7. Connect Power and Ground Wires

Connect the power wire from the keyless entry module to a 12V constant power source. This can usually be found in the fuse box or directly from the battery. Next, connect the ground wire to a clean, unpainted metal surface in your car.

8. Connect Lock and Unlock Wires

Locate the lock and unlock wires in your car’s wiring harness. These wires control the door lock actuators. Use a multimeter to verify the correct wires by checking for a voltage change when you lock or unlock the doors using the manual switch. Once identified, connect the lock and unlock wires from the keyless entry module to these wires. Depending on your car’s wiring, you may need to use relays for proper operation.

9. Connect the Ignition Wire

Connect the ignition wire from the keyless entry module to a wire that receives power when the ignition is turned on. This wire is typically found near the ignition switch.

10. Connect Optional Wires

If your keyless entry system includes additional features like trunk release or parking light flash, connect these wires to the appropriate circuits in your car. Refer to the system’s manual for specific instructions on these connections.

11. Solder and Secure Connections

For a secure and reliable installation, it’s recommended to solder all wire connections. After soldering, insulate each connection with electrical tape or heat shrink tubing. Use zip ties to organize and secure the wires, preventing them from interfering with moving parts or becoming damaged.

12. Mount the Antenna

If your keyless entry system includes an antenna for extended range, mount it in a location with minimal obstructions, such as the upper corner of the windshield. Ensure the antenna wire is routed away from any sources of electrical interference.

13. Test the System

Before reassembling any panels or covers, reconnect the battery and test the keyless entry system. Verify that all functions, including locking, unlocking, trunk release, and any other features, work correctly. If any issues arise, double-check your connections and wiring.

14. Reassemble the Panels

Once you’ve confirmed that the keyless entry system is functioning correctly, reassemble any panels or covers you removed during the installation process. Ensure all components are securely fastened and that no wires are pinched or exposed.

Advanced Tips

15. Use a Multimeter for Accurate Readings

A multimeter is a crucial tool for accurately identifying and verifying wires. Use it to check voltage levels and ensure you’re connecting the keyless entry module to the correct wires.

16. Consult Online Forums and Tutorials

If you encounter any difficulties, online forums and video tutorials can be invaluable resources. Many car enthusiasts share their experiences and solutions, which can help you troubleshoot any issues.

17. Consider Professional Installation

If you’re not comfortable with electrical work or if your car has a complex wiring system, consider having the keyless entry system professionally installed. This ensures a flawless setup and avoids potential damage to your vehicle’s electrical system.


Installing a keyless entry system on your car enhances convenience, security, and value. By following this comprehensive guide, you can successfully install a keyless entry system, ensuring a smooth and reliable operation. Remember to gather the necessary tools, read the instructions carefully, and take your time with the installation. Whether you’re a seasoned DIYer or a novice, these steps will help you achieve a professional-quality installation. Enjoy the added convenience and peace of mind that comes with your new keyless entry system.

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