Smart Hands-Free Trunk Release System: Installation & Troubleshooting Manual

Universal Aftermarket Kit

---

Overview & Safety Protocol

This Hands-Free Kick Sensor system is designed for vehicles already equipped with an Electric Tailgate (Power Liftgate).

• Security Logic: The sensor is only active when the original car smart key is within range (usually 1.5m) or the vehicle is unlocked. This prevents accidental opening while driving or at a car wash.

---

1. Parts List & Component Check

Before starting the installation, ensure all components are present:

• Kick Sensor ECU Control Box: The "brain" of the system (ensure the label side faces up during installation).
• Sensor Cable: High-sensitivity induction wire.
• Wiring Harness: 4-wire configuration (Red, Yellow, Gray, Green).
• Mounting Kit: 3M adhesive tape and Posi-tap connectors.

---

2. Wiring Diagram & Pin Definition

Proper electrical connection is the core of a stable installation. Follow the "Powered Version" wiring diagram below:

• Red Wire (12V Positive): Connect to a constant 12V power source (Battery +).
• Yellow/White Wire (ACC): Connect to the Accessory power or Ignition signal to ensure the sensor deactivates when the engine is running.
• Black Wire (Grounding): Connect to the vehicle chassis or a clean metal grounding point.
• Green Wire (Hand Switch Signal): Connect to the Negative Trigger line of the original external trunk release button (handle switch).
  • Note: This wire sends the pulse signal required to initiate the opening sequence.
  • The outer handle button shown in the figure below
    

---

3. Optimal Sensor Placement & Mounting

Placement is critical for "one-kick" success rates.

• Location: The sensor box must be mounted inside the rear bumper.
• Orientation: The side labeled "脚踢ECU (此面朝上)/SENSOR" must face upwards toward the sky.
• Distance: Position the sensor at the specific arc where your foot naturally reaches under the bumper (as shown in the diagram).
• Fixing: Use the provided 3M adhesive tape. Ensure the bumper surface is cleaned with alcohol for maximum adhesion.

---

4. Sensitivity Adjustment & Calibration

If the sensor is too sensitive or not responsive enough:

1. Ensure there are no metal objects shielding the sensor box.
2. Adjust the angle of the sensor box slightly if the "kick" gesture isn't being captured consistently.
3. The "Kick" Gesture: Use a smooth, forward-and-back kicking motion under the center of the bumper. Do not hold your foot under the sensor; a quick 1-second motion is best.

---

5. Advanced Troubleshooting & FAQ

Q1: The sensor is not working after installation.

Major Check: The Green Wire (Signal Trigger). The Green wire is the most common source of installation failure. Please double-check:

1. Correct Switch Location: Ensure the Green wire is tapped into the External Trunk Release Button (the handle switch outside the car). DO NOT connect it to the inner closing button located on the tailgate itself.
2. Verify Negative Trigger (Critical): The system operates on a Negative Trigger signal. If you are unsure which wire is the trigger, follow this professional testing method:
   • The Test Light Method: Use a 12V automotive test light. Connect the ground clip to a clean, unpainted metal bolt on the chassis.
   • The Test: Gently probe the wires behind the external handle switch. The specific wire that triggers the trunk to close when touched by the probe is the Negative Trigger Line.
   • (Refer to the operation video below for a visual demonstration)
     

Q2: The sensor is not sensitive or fails intermittently.

1. Avoid Metal Interference: The sensor ECU uses electromagnetic induction. DO NOT mount the sensor box on or near any metal reinforcements. It must be installed behind the plastic bumper cover. Metal shielding will block the signal completely.
2. Check Orientation: Ensure the sensor is not installed upside down. The side labeled "脚踢ECU (此面朝上)/SENSOR" must face the sky (upwards).
3. Distance Check: Ensure there is no heavy mud, snow, or thick metal-based paint directly blocking the sensor's "vision" through the bumper.

Q3: Can I install this if I don't have an electric tailgate?

• Answer: No. This system is an add-on controller. It sends a signal to trigger an existing power liftgate. If your trunk is manual, this sensor will not be able to lift it.

Q4: The sensor I received is different from the one shown above. (Version 2).

• This is the Version 2 kick sensor. Except for the plug-in connection of the sensor itself, all other wiring （The yellow wire mentioned above corresponds to the white wire, **connect to ACC**.）methods are the same. Please refer to the video below for the specific