Power Sliding Rear Window Kit

So, you're thinking about upgrading your truck or SUV with a power sliding rear window kit? Excellent choice! It's a fantastic modification that adds both convenience and ventilation. While it might seem daunting, installing one of these kits is well within the capabilities of an experienced DIYer with the right tools and a good understanding of automotive wiring. This article will walk you through the key aspects, from understanding the components to tackling the installation process.

Understanding the Power Sliding Rear Window Kit

Before diving into the installation, let's break down what a power sliding rear window kit typically includes. This will give you a solid foundation for the work ahead.

Core Components

Sliding Window Assembly: This is the heart of the kit. It replaces your existing fixed rear window with a window that can slide open and closed. The assembly includes the glass, frame, and the all-important motor.
Motor and Drive Mechanism: This is what actually powers the window's movement. It usually consists of a small DC motor coupled to a gear or cable system that pulls or pushes the window open and closed. Understanding how this mechanism works is crucial for troubleshooting later on.
Wiring Harness: A pre-made wiring harness greatly simplifies the electrical connections. It includes wires for power, ground, and control signals. Look for a harness with clearly labeled wires and high-quality connectors.
Switch: This is how you'll control the window. It can be a simple up/down rocker switch, a more sophisticated multi-function switch, or even integrated into your vehicle's existing controls (though this requires more advanced wiring).
Relay (if required): Some kits include a relay. A relay is an electrically operated switch that allows a low-current circuit (from the switch) to control a high-current circuit (the motor). This is important to protect your switch from damage.
Installation Hardware: This includes all the screws, clips, seals, and weather stripping needed to properly secure the new window assembly in place.

Key Considerations Before You Buy

Not all kits are created equal. Before you spend your money, consider these factors:

Vehicle Compatibility: This is paramount! Ensure the kit is specifically designed for your make, model, and year. Check the manufacturer's compatibility chart carefully.
Window Type: Do you want a solid glass window, or a window with privacy tint? Consider your personal preferences and local regulations.
Motor Quality: A cheap motor is a recipe for future headaches. Research the manufacturer and look for reviews that mention motor reliability.
Wiring Harness Quality: A well-made harness with durable connectors is worth the extra cost. It will save you time and frustration during installation and reduce the risk of electrical problems later.
Installation Instructions: Clear, detailed instructions are essential for a successful DIY project. Look for kits that provide step-by-step instructions with diagrams or videos.

The Installation Process: A Step-by-Step Guide

Now for the fun part! Remember to always disconnect the negative terminal of your battery before working on any electrical components. This is a crucial safety precaution.

1. Removing the Existing Rear Window

This is often the most challenging step. The exact procedure will vary depending on your vehicle and how the original window is installed. Generally, you'll need to:

CAUTION: Wear safety glasses and gloves to protect yourself from broken glass. Consider using specialized glass removal tools, like a cold knife or wire saw, to cut through the adhesive.

Remove Interior Trim: Carefully remove any interior trim pieces that surround the window.
Cut the Adhesive: Use a cold knife or wire saw to cut through the adhesive sealant that holds the window in place. Work slowly and carefully to avoid damaging the surrounding body panels.
Remove the Window: Once the adhesive is cut, gently push the window out from the inside. Have a helper ready to catch it on the outside.
Clean the Opening: Thoroughly clean the window opening, removing any remaining adhesive or debris. A solvent like acetone or isopropyl alcohol can be helpful.

2. Installing the New Window Assembly

With the old window out, you can now install the new power sliding window assembly.

Test Fit: Before applying any sealant, test fit the new window assembly to ensure it fits properly.
Apply Sealant: Apply a bead of automotive-grade urethane sealant around the perimeter of the window opening, following the manufacturer's instructions.
Install the Window: Carefully position the new window assembly into the opening. Press it firmly into place to ensure good contact with the sealant.
Secure the Window: Use the provided screws or clips to secure the window assembly to the vehicle's body.
Allow the Sealant to Cure: Allow the sealant to cure completely, according to the manufacturer's instructions, before moving on. This is crucial for preventing leaks.

3. Wiring the Power Sliding Window

This is where your electrical skills come into play. The wiring harness usually has labeled wires for power, ground, and switch connections.

Identify Power Source: Determine a suitable power source for the window motor. This should be a 12V DC source that is capable of supplying enough current to operate the motor. Consider using a fuse tap to tap into an existing circuit, or run a new wire directly from the battery with an inline fuse.
Connect the Ground: Connect the ground wire to a solid ground point on the vehicle's chassis.
Install the Switch: Mount the switch in a convenient location within reach of the driver.
Connect the Switch Wires: Connect the switch wires to the wiring harness, following the instructions provided with the kit.
Connect the Motor Wires: Connect the motor wires to the wiring harness, again following the instructions. Pay close attention to polarity – reversing the wires may cause the window to operate in reverse.
Install the Relay (if required): If the kit includes a relay, connect it according to the wiring diagram. The relay is typically used to switch the high-current power to the motor based on the low-current signal from the switch.

4. Testing and Final Touches

Before putting everything back together, test the window to make sure it works correctly.

Reconnect the Battery: Reconnect the negative terminal of your battery.
Test the Window: Operate the switch to open and close the window. Verify that it moves smoothly and without any binding.
Check for Leaks: Use a hose to spray water around the perimeter of the window to check for any leaks. If you find any leaks, apply additional sealant.
Reinstall Interior Trim: Reinstall any interior trim pieces that you removed earlier.

Troubleshooting Common Issues

Even with careful installation, problems can sometimes arise. Here are a few common issues and how to address them:

Window Won't Move: Check the fuse, the wiring connections, and the motor itself. Use a multimeter to check for voltage at the motor when the switch is activated. If there's voltage but the motor doesn't run, the motor may be faulty.
Window Moves Slowly or Jerkily: This could be due to a weak motor, insufficient power, or binding in the drive mechanism. Check the voltage at the motor and lubricate the drive mechanism.
Window Operates in Reverse: This is usually caused by reversed wiring polarity. Simply swap the motor wires.
Leaks: Reapply sealant around the perimeter of the window. Ensure the sealant is compatible with both the glass and the vehicle's body.

Final Thoughts

Installing a power sliding rear window kit is a rewarding project that can significantly enhance your vehicle's functionality and comfort. By understanding the components, following the installation instructions carefully, and taking your time, you can achieve professional-quality results. Remember to prioritize safety, use quality tools and materials, and don't hesitate to seek help from a professional if you encounter any difficulties. Good luck, and enjoy your new power sliding rear window!