Fumbling for your keys in the dark or with your hands full is a familiar frustration for many drivers. What if you could unlock your car with the simple press of a button? Modern convenience isn’t just for new vehicles; you can upgrade your trusted older car with the latest technology. This guide will walk you through the entire process, showing you how to add keyless entry to car and enjoy a new level of ease and security. We will cover everything from selecting the right kit to the final installation steps, making this project accessible even if you are new to automotive DIY tasks.
Why Add Keyless Entry to Your Car?
Upgrading your vehicle with a keyless entry system is more than just a cool feature; it offers significant practical benefits that enhance both convenience and security. The most obvious advantage is the ability to lock and unlock your doors from a distance. This is incredibly helpful when you’re carrying groceries, managing children, or trying to find your car in a crowded parking lot. Many systems flash the car’s lights or sound a brief horn chirp, providing visual and audible confirmation that your vehicle is secure.
Beyond convenience, keyless entry systems boost your car’s security. Manually locking each door leaves room for error, but a remote system secures all entry points simultaneously with one button press. Some advanced kits even include features like a panic alarm, which can be activated from your fob to deter potential threats. Adding this technology can also increase your vehicle’s resale value, as it is a desirable feature for modern buyers. For a relatively small investment in time and money, you gain peace of mind and daily convenience.
8 Step-by-Step Guide on How to Add Keyless Entry to Car
Step 1: Choose the Right Keyless Entry Kit
Before starting, you need to select a keyless entry system that is compatible with your vehicle. Universal kits are designed to work with most cars that have existing power door locks. However, if your car has manual locks, you will need a more comprehensive kit that includes door lock actuators. Carefully read the product descriptions and reviews to ensure the kit includes all necessary components, such as the control module, wiring harnesses, remote fobs, and clear instructions. Some premium kits may offer extra features like trunk release or a car finder function, so consider which options are important to you.
Step 2: Gather Your Tools and Prepare Your Workspace
Once you have your kit, the next step is to gather all the tools you’ll need for the installation. A basic set of tools should suffice, including a socket set, wire cutters, wire strippers, electrical tape, a test light or multimeter, and a set of plastic trim removal tools to avoid scratching your car’s interior panels. It is also wise to have zip ties on hand to secure loose wires neatly. Work in a well-lit, dry area like a garage or covered carport. Disconnect the negative terminal of your car’s battery before you begin working on any electrical components to prevent short circuits and ensure your safety.
Step 3: Locate Your Car’s Wiring Schematics
This is a crucial step for a successful installation. You need to identify the specific wires in your car that control the door locks. The best resource for this is your vehicle’s factory service manual, which provides detailed wiring diagrams. If you don’t have a manual, you can often find wiring schematics online through automotive forums or paid subscription services that cater to your car’s make and model. The key wires you’ll need to locate are the power, ground, and the lock/unlock trigger wires. Correctly identifying these wires is essential for the system to function properly.
Step 4: Install the Control Module
The control module is the brain of your new keyless entry system. You need to find a secure and hidden location to mount it, typically under the dashboard on the driver’s side. This placement keeps it out of sight and protects it from being accidentally kicked or damaged. A common spot is high up behind the fuse box or near the steering column. Use zip ties or the provided screws to firmly attach the module to a sturdy metal bracket or a thick bundle of factory wires. Ensure it is not obstructing any moving parts like the pedals or steering linkage.
Step 5: Connect the Power and Ground Wires
With the control module mounted, it’s time to provide it with power. Your kit’s instructions will specify which wires are for power and ground. The ground wire, usually black, should be connected to a solid metal point on the car’s chassis. An unpainted bolt under the dash is an ideal grounding point. The main power wire, often red, needs to be connected to a constant 12-volt source—one that has power even when the ignition is off. You can often find this at the vehicle’s fuse box using a fuse tap for a clean and safe connection.
Step 6: Connect to the Door Lock and Unlock Wires
This is where your wiring diagram becomes invaluable. You need to tap into your vehicle’s factory door lock trigger wires. These wires send the signal to lock or unlock the doors. Using your test light or multimeter, confirm you have the correct wires by testing them as you manually operate the lock switch inside the car. Once identified, use the supplied T-taps or solder the connections for a more secure bond. Be sure to follow the kit’s instructions carefully, as different vehicles use different types of electrical systems (positive, negative, or reverse polarity).
Step 7: How to Add Keyless Entry to a Car with Manual Locks (Optional)
If your vehicle has manual locks, the process is more involved because you must first install door lock actuators. This requires removing the interior door panels to access the lock mechanisms. Each actuator must be mounted inside the door and connected to the lock rod. You will then run the wiring from the actuators through the door’s protective rubber boot and into the car’s cabin, connecting them to the control module. This step turns your manual locks into power locks that the keyless entry system can control. It requires more time and patience but is essential for the upgrade.
Step 8: Connect Parking Light and Horn Wires (Optional)
Many kits offer the feature of flashing the parking lights or sounding the horn as a confirmation signal. To enable this, you must locate the corresponding wires. The parking light wire is typically found in the wiring harness near the steering column or at the headlight switch. The horn wire can also be found in the steering column harness. Tap into these wires according to your kit’s diagram. This step adds a professional touch and provides helpful feedback, letting you know from a distance that your car has successfully locked or unlocked.
Test the System and Tidy Up
Before you reassemble everything, reconnect your car’s negative battery terminal and test the keyless entry system. Use the remote fobs to lock and unlock the doors multiple times. Check that all doors are responding correctly and that any optional features, like the light flash or horn chirp, are working as expected. Once you have confirmed everything is functioning properly, neatly bundle all the new wiring with zip ties to prevent rattling or interference. Carefully reinstall all the interior trim panels you removed.
Frequently Asked Questions
Can I Add Keyless Entry to Any Car?
Yes, you can add keyless entry to almost any car. If your vehicle already has power door locks, you can install a basic aftermarket kit. If your car has manual locks, the process is more intensive, as you will also need to install door lock actuators inside each door. While it is a more complex job, it makes the upgrade possible for a much wider range of older and base-model vehicles, bringing modern convenience to classic cars.
How Much Does It Cost to Add Keyless Entry?
The cost varies depending on the kit and whether you do the installation yourself. A basic universal keyless entry kit for a car with existing power locks can cost between $30 and $70. If you need a kit with actuators for manual locks, the price can range from $100 to $200. Professional installation can add another $100 to $300 to the total cost, depending on the complexity of your vehicle and local labor rates.
Is It Hard to Install Keyless Entry Yourself?
For someone with basic mechanical and electrical skills, installing a keyless entry system is a manageable DIY project. The most challenging part is correctly identifying and tapping into the vehicle’s wiring. Patience and a good wiring diagram are essential. If you are uncomfortable working with your car’s electrical system or removing interior panels, it is best to hire a professional installer to ensure the job is done correctly and safely.
Will an Aftermarket Keyless Entry System Affect My Car’s Warranty?
Generally, installing an aftermarket part like a keyless entry system should not void your entire vehicle warranty. However, if the installation is done improperly and causes damage to the car’s electrical system or other components, the manufacturer may refuse to cover repairs for those specific issues. To minimize risk, ensure the installation is performed correctly or have it done by a reputable professional.
Can I Get a System That Also Includes a Remote Start?
Absolutely. Many aftermarket systems combine keyless entry with a remote start feature. These combination kits are more complex and expensive to install but offer the added luxury of starting your car from a distance to warm it up in the winter or cool it down in the summer. Due to the increased complexity involving the ignition and anti-theft systems, professional installation is highly recommended for remote start kits.
Conclusion
Upgrading your vehicle with a keyless entry system is a rewarding project that adds a significant amount of convenience and security to your daily driving experience. By following the steps outlined in this guide—from choosing the right kit to carefully connecting the wires and testing the final setup—you can successfully complete this modification. The satisfaction of pressing a button and hearing your doors lock is well worth the effort. Now that you know how to add keyless entry to car, you can tackle this project with confidence and enjoy the benefits of this modern feature.
