Possible reasons for failed unlocking of a trunk lock:

1. Stuck or rusted lock cylinder: The lock cylinder may be rusted or stuck if it is left unused for long, eroded by rainwater, or impacted by accumulated dust.

2. Displacement or deformation of lock catch: The trunk has been hit or closed forcefully and frequently, causing the lock catch (U-shaped ring) to displace or deform, and making it unable to align with the lock bolt.

3. Blocking by foreign objects or detachment of the linkage rod: Mud or tree branches may get stuck in the lock bolt gap, and the linkage rod of the manual trunk may break/uncouple. 

4. Remote key malfunction: Depletion of the key battery, signal interference or button damage may prevent transmission of unlocking signals.

5. Actuation mechanism malfunction: The system may fail to respond to unlocking instructions due to motor aging or burnout or solenoid valve jamming.

6. Control circuit or module malfunction: Such malfunctions include short circuit/open circuit, loose plug, or errors in the body control module (BCM) program. 

7. Accidental triggering of the anti-theft system: The vehicle's anti-theft system locks the trunk (e.g., due to misoperation or system failure).    

8. Sealing strip aging: Loss of elasticity of a sealing strip may prevent the trunk from fully closing, and consequently affect locking function.

Troubleshooting for trunk lock malfunctions and suggested emergency measures

1. Try mechanical unlocking first: Find the hidden keyhole in the trunk (by referring to the vehicle manual) and turn the mechanical key counterclockwise to open it.

2. Quick self-check steps: Check key battery level → lubricate lock cylinder/connecting rod → clean foreign objects → confirm child lock status.

3. Criteria for repair:

If an electronic function (e.g., remote control or in-car button) fails but the mechanical key is valid → electronic malfunction (check the circuit/module);

If the mechanical key is also invalid → mechanical failure (the lock body needs to be detached).

Improvement solutions adopted for vika trunk locks.

1. vika trunk locks are made of specialized high-strength sheets with a strength level of 15000N, which lead to 36% performance improvement.

2. High-quality lubricating oil with better temperature resistance is used with a temperature range of -45℃~80 ℃, exceeding the standard range by 20%.

3. The ZP waterproof micro switch solves the problem of switching signal failure caused by water and dust ingress.

4. High-strength and high-toughness DuPont materials are used to make gears and worms, thus solving the problem of transmission failure caused by wear during long-term use.

5. Customized motors from major brands are adopted, and thermal protection function is added to solve the problem of motor burnout during long-term use of the product.