Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of the TINIANHHCT Power Liftgate Retrofit system, designed specifically for Buick Envista models from 2024 and 2025. This system enhances vehicle functionality by providing automated control over the tailgate, including an optional foot sensor for hands-free operation.
Product Overview
Key Features
- Automated opening and closing of the tailgate.
- Control via original car key remote.
- Control via driver's seat button.
- Control via tailgate button.
- Optional kick sensing for hands-free operation.
- Anti-pinch safety feature: Tailgate automatically reverses if an obstacle is detected during closing.
- Audible alarm during tailgate operation (closing or opening).
- Adjustable and memorizable tailgate opening height.
- Low noise operation (as low as 42dB).
- Electric suction locking mechanism for secure closure.
Components Included
The package contains the following components:
- Control Box
- Two (2) Support Poles
- Wiring Harnesses
- Control Buttons
- Kick Sensor (for models with kick sensing feature)
- Mounting Brackets and Hardware

Image: Overview of the power liftgate retrofit kit components, including the control box, support poles, wiring, buttons, and kick sensor, alongside an illustration of a user operating the liftgate with a foot sensor.
Setup and Installation
This power liftgate retrofit system is designed for installation in Buick Envista 2024 and 2025 models. Due to the complexity of automotive electrical and mechanical systems, professional installation is strongly recommended to ensure proper function and safety. All products undergo original car testing to ensure compatibility and performance.
Detailed installation instructions, including wiring diagrams and mounting procedures, are typically provided with the product package. If you have any questions during the installation process, please refer to the support section for contact information.
Operating Instructions
Control Methods

Image: Depicts four control methods: original car key remote, driver's seat button, trunk button, and optional kick sensing.
- Original Car Key Control: Use the designated button on your vehicle's original car key remote to open or close the tailgate. Refer to your vehicle's manual for specific key functions.
- Driver's Seat Button Control: A dedicated button, typically installed near the driver's seat, allows for convenient opening and closing of the tailgate from inside the vehicle.
- Trunk Button Control: A button located on the tailgate itself provides direct control for opening and closing when you are at the rear of the vehicle.
- Kick Sensing Control (Optional): For models equipped with the kick sensor, a simple foot-lifting action directly below the car's rear bumper will activate the tailgate. Ensure there are no obstacles in the tailgate's path before activation.

Image: A person using the foot induction switch to open the trunk, demonstrating the hands-free operation.
Height Setting Adjustment
The tailgate opening height can be freely controlled and adjusted to suit your preference. The system allows for memorization of a preferred height position.

Image: Illustrates the humanized height setting feature, showing different adjustable height positions (1st, 2nd, 3rd gear) for the open tailgate.
Safety Features
- Anti-Pinch: If the tailgate encounters an obstacle during closing, it will automatically reverse its direction to prevent injury or damage.
- Audible Warning: An alarm will sound when the tailgate is in motion (opening or closing) to alert nearby individuals.

Image: Shows a car with its tailgate open, indicating low noise operation (42dB) from the intelligent motor, with a child sleeping peacefully in a car seat.
Maintenance
The TINIANHHCT Power Liftgate Retrofit system is designed for durability and minimal maintenance. Regular checks are recommended to ensure optimal performance:
- Periodically inspect the support poles for any signs of wear or damage.
- Ensure that the tailgate area is clear of debris that could interfere with the closing mechanism or sensors.
- Keep the kick sensor area clean for reliable operation.
- Avoid applying excessive force to the tailgate when it is in automatic operation.
Troubleshooting
If you encounter any issues with your power liftgate system, consider the following:
- Tailgate not responding: Check if the vehicle's battery is adequately charged. Ensure all connections are secure (if accessible and safe to check).
- Tailgate not closing fully or reversing unexpectedly: Inspect the tailgate path for any obstructions. The anti-pinch feature will activate if an object is detected.
- Abnormal warning sounds: The system is equipped with an abnormal warning feature. If unusual sounds or warnings occur, cease operation and consult the manufacturer.
- Kick sensor not working: Ensure the sensor area under the bumper is clean and free from dirt or ice. Confirm the foot motion is a clear "kick" action directly under the sensor.
For persistent issues or complex problems, it is recommended to contact professional automotive service or the manufacturer's support team.

Image: Illustrates common user problems such as holding heavy objects, dirty tailgate, insufficient height, and cold weather issues, alongside a list of core functions including low noise, anti-pinch, remote control, and altitude memory.
Specifications
| Attribute | Detail |
|---|---|
| Brand | TINIANHHCT |
| Model Number | DDWM-whh-085-Kis |
| Compatibility | Buick Envista 2024, 2025 |
| Material | ABS Plastic, Stainless Steel Support Rod |
| Auto Part Position | Rear |
| Noise Level | As low as 42dB |
Warranty and Support
Warranty Information
This product comes with a 5-year warranty. Please retain your proof of purchase for warranty claims.
Customer Support
For any questions regarding compatibility, installation, operation, or troubleshooting, please contact the manufacturer via email. Professional guidance will be provided.
Note: Product appearance and specific components may vary slightly depending on the exact vehicle model and production batch.