What are the reasons why the trunk of a BMW 740 cannot be opened?
3 Answers
The reasons why the trunk of a BMW 740 cannot be opened may include linkage rod or lock cylinder failure, mechanical component failure, etc. Below is a detailed introduction about BMW cars: 1. Overview: BMW cars, produced by Bayerische Motoren Werke AG (abbreviated as BMW), primarily include series models such as 1, 2, 3, 4, 5, 6, 7, and 8. BMW is renowned worldwide for manufacturing luxury cars, motorcycles, and high-performance engines. 2. Logo: The BMW logo features a double-circle design with the 'BMW' inscription above the circles. The entire emblem resembles the sky, clouds, and a continuously rotating propeller, symbolizing the company's long history and its consistent purpose and goals.
As a mechanic with years of experience, there are several common reasons why the trunk of a BMW 740 may not open. The most frequent issue is a blown electrical fuse, located in the engine compartment fuse box—simply replacing it should fix the problem. Another common cause is a damaged, aged, or jammed trunk lock motor. Control module failures are also quite common, as the smart system can occasionally malfunction. When the remote key battery is weak, the signal may be too faint to open the trunk; try replacing the coin battery. The manual lock is often overlooked—pull the emergency release handle (usually located behind the interior trim panel) to see if it opens. Wiring shorts or poor connections are also frequent culprits, especially if rainwater has seeped in. A malfunctioning trunk affects luggage access and safety, so it must be addressed promptly: first, check the fuse and key battery yourself. If the issue persists, don’t hesitate—take it to a dealership for diagnosis with specialized equipment. This problem occurs more often in winter when the battery is weak, so regular maintenance can help prevent it.
Friend, I also experienced the trunk of my BMW 5 Series refusing to open. After some troubleshooting, I found out it was a blown trunk fuse—replacing it with a new one only cost a few bucks. If the key remote isn’t working, it’s often just a dead battery; try replacing it with a CR2032 from the supermarket. If the lock mechanism or control board is faulty, it might cost a bit more to fix. BMW has an emergency unlock handle designed inside the trunk lid—just pull it manually to open, and check if dust is blocking it. Poor wiring contact or a software bug could also be the culprit, but don’t start disassembling randomly. This issue can be a real headache when you need to load luggage or groceries, so get it checked at a repair shop ASAP—a BMW diagnostic scan will quickly pinpoint the problem. To minimize wear, avoid frequently opening and closing the trunk in daily use.
