1. Introduction
This manual provides detailed instructions for the installation and use of the Larlansz 12V Universal Power Window Switch Kit. This kit is designed to convert manual windows to power windows in 2-door vehicles, offering a convenient upgrade for your automobile.
Please read this manual thoroughly before beginning installation to ensure proper setup and safe operation.
2. Product Overview
The Larlansz 12V Universal Power Window Switch Kit is a complete solution for upgrading your vehicle's manual windows. It includes all necessary switches and wiring harnesses for a 2-door vehicle conversion.
- High-quality components for reliable performance.
- Designed for mounting on door panels.
- Facilitates the conversion from manual to power windows.
This kit is intended for DIY installation and requires some basic knowledge of automotive electrical systems.
3. Package Contents
Verify that all items listed below are present in your package:
- 3 x Power Window Switches
- 1 x Switch Holder (for 2 switches)
- 1 x Switch Holder (for 1 switch)
- 3 x Wire Harnesses

Image 1: Complete kit components including three switches, two switch holders, and three wire harnesses.
4. Setup and Installation
Installation of this kit requires familiarity with automotive electrical modifications. It is recommended to consult online resources, such as video tutorials for 'Chevy power windows wire diagram', for visual guidance.
4.1. Pre-Installation Check
Before running all wiring through the doors, it is highly recommended to test the wiring connections. You can do this by connecting the components to a 12V battery on the floor near the door you are working on. This step helps ensure all wiring is correct before final installation, saving significant effort.
4.2. Wiring Connections
The kit's switches come pre-wired. Your primary task is to provide a 12V positive power source, connect the wire with the inline fuse, and connect the ground (black wire).
- Power Source: Connect the main power supply to a switched source (e.g., a circuit that receives power only when the ignition key is on). Connecting to a constant 12V source will keep the LED lights on in the switches continuously, which may drain your vehicle's battery over time.
- Ground: Connect the black wire to a reliable chassis ground point.
- Window Motor Connections: Connect the appropriate wires from the harness to your power window motors. Refer to a vehicle-specific wiring diagram if available.
4.3. Mounting Switches
The switches are designed to be mounted on your vehicle's door panels. You may need to cut openings in your door panels to accommodate the switch holders. Ensure precise measurements for a clean fit.

Image 2: Example of an installed power window switch in a vehicle door panel.

Image 3: Dimensions for switch holders and individual switch components to aid in panel cutting.
5. Operating Instructions
Once the kit is correctly installed and powered, operating your new power windows is straightforward:
- To lower the window, press the switch down.
- To raise the window, press the switch up.
6. Maintenance
The Larlansz Power Window Switch Kit is designed for durability and requires minimal maintenance. However, periodic checks can help ensure long-term performance:
- Wiring Inspection: Periodically inspect all visible wiring for any signs of wear, fraying, or damage.
- Connection Security: Ensure all electrical connections remain tight and secure. Loose connections can lead to intermittent operation or failure.
- Switch Cleanliness: Keep the switches clean and free from dust, dirt, or debris that could impede their operation. Use a soft, dry cloth for cleaning.
7. Troubleshooting
If you encounter issues with your power window kit, refer to the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| Windows do not operate / No power to switches | No 12V power supply Blown fuse Loose ground connection | Check the 12V power source connection. Inspect and replace the inline fuse if blown. Verify the ground wire is securely connected to chassis. |
| Window moves slowly or intermittently | Weak power connection Issue with window motor Binding window mechanism | Ensure all connections are tight and clean. Inspect window motor for proper function. Check window tracks for obstructions or lubrication needs. |
| LED lights on switches remain lit constantly | Connected to constant 12V power source | Relocate the main power supply wire to a switched 12V source (e.g., ignition-switched). |
| Switch feels loose or unresponsive | Improperly seated switch Internal switch damage | Ensure the switch is fully seated in its holder. If damaged, the switch may need replacement. |
8. Specifications
| Feature | Detail |
|---|---|
| Product Dimensions | 7.87 x 4.72 x 1.57 inches |
| Item Model Number | Power Window Switch |
| Operation Mode | OFF-NONE-ON |
| Operating Voltage | 12 Volts |
| Contact Type | Normally Open |
| Connector Type | Plug In |
| Brand | Larlansz |
| Terminal Type | Blade |
| Circuit Type | Parallel |
| Actuator Type | Push Button |
| Contact Material | Metal |
9. Warranty and Support
Specific warranty information for the Larlansz 12V Universal Power Window Switch Kit is not provided within this manual. For details regarding warranty coverage, terms, and conditions, please refer to the product packaging or contact the seller or manufacturer directly.
For technical support or further assistance with installation and troubleshooting, please reach out to the Larlansz customer service or the retailer from whom you purchased the product.





