BMW 640d Power Trunk Upgrade Review

Why a Power Trunk is Essential for Your BMW 640d

Many owners of premium imported cars find themselves wishing for a bit more convenience. For BMW 640d owners, a common point of regret is the absence of a power trunk. Having to manually lift the trunk can be cumbersome, especially on rainy days or when your hands are full. This review details the experience of upgrading a BMW 640d with a power trunk installation by Today's Car Seocho branch.

The owner of this BMW 640d realized the trunk wasn't powered after purchasing the new car and reviewing its factory options. They felt that a luxury sedan like the 640d should come equipped with such a feature. After comparing various options, they chose Today's Car, prioritizing the ability to use genuine parts for a factory-like finish.

Addressing the Manual Trunk Inconvenience

The standard BMW 640d requires manual lifting of the trunk. The key fob lacks a dedicated trunk open button, necessitating a manual operation every time. This becomes particularly inconvenient in adverse weather or when carrying multiple items. Compared to higher trim levels within the same model line that feature a factory-installed power trunk, this omission was a notable drawback.

Seamless Power Trunk Installation Process

The power trunk system installed by Today's Car utilizes high-quality aftermarket genuine parts. The key to the installation is preserving the original wiring harness. Instead of modifying existing electrical circuits, the system connects using dedicated connectors, ensuring a direct integration that can be fully reversed without damaging the vehicle's exterior or interior.

The installation process involves several key steps:

1. Strut Installation: Hydraulic struts are mounted on the left and right sides of the trunk. These struts provide the lifting force, ensuring the trunk opens smoothly and stays securely in place. The gas-pressure system automatically adjusts to weight variations.
2. Motor and Switch Integration: Electric actuators, which are linear motion motors, are attached to the interior sides of the trunk. These actuators extend and retract to move the trunk lid up and down. Their placement is optimized to maximize trunk space and avoid interfering with cargo.
3. Control Unit Setup: Control switches are strategically placed in three locations: a manual close button inside the trunk for safety, an electronic button near the driver's door or dashboard, and integration with the original remote key fob for remote operation.
4. Safety Sensor Implementation: A crucial feature is the safety detection sensor. This system automatically stops the trunk's descent if it detects an obstruction, such as a person or object, within a 5cm range. This provides protection for children and pets. The sensitivity of these sensors can be fine-tuned post-installation.

Post-Installation Results and Refined Finish

The transformation is immediately apparent. With a single button press, the trunk opens slowly and smoothly, eliminating the need for manual lifting. Closing the trunk is equally effortless, with the remote or button initiating a quiet and stable automatic closure. The speed is set between 3-4 seconds, providing a comfortable pace.

The finish is as clean and integrated as a factory option. All added components are neatly arranged within the trunk, and wiring is concealed. There are no visible traces left on the vehicle's exterior, and the installation is fully reversible, allowing for a return to the original state if desired.