Wiring Harness Design for BMW 3 Series

It is easy to limit one's field of vision when designing behind closed doors. When designing products, wiring harness engineers should visit their peers more to see how they design, collect their designs, constantly study their peers, stand on the shoulders of outstanding people, learn from optimization, and their design level will definitely rise greatly. Here, let's take a look at the wiring harness design of BMW 3 Series.

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The BMW 3 Series is one of the best-selling entry-level luxury cars in the world, and it is also BMW's most successful and largest-selling car series. Nowadays, on average, one out of every two BMW cars in the world is a 3 Series. I collected some pictures on the Internet. Today, let's take a look at the wiring harness design of the BMW 3 Series. When we opened the cabin cover, we found that the cabin layout of the BMW 3 Series is very beautiful. The wiring harnesses are basically invisible except for the left and right sides, and the wiring harnesses on the left and right sides show a certain degree of symmetry. Let's focus on the right side, and we can see that the cable tie (pay attention to the structure of the matching buckle on the lower body) is fully wrapped with cloth-based tape behind it. The tail of the air-conditioning pressure switch plug-in here is not treated with wire leakage. It is proposed separately for comparison with the plug-in on the engine, which will be discussed later. Let's focus on the left wiring harness again. It can be seen that the power cord is also fully wrapped with cloth-based tape. Here, at the same time, pay attention to the structure of the small bracket for fixing the wiring harness of the car body. When designing, if the car body sheet metal can't be opened, you might as well refer to BMW's scheme. The branches of the wiring harness in the picture are insulated with tin foil near the exhaust pipe. As shown in the figure below, we mainly look at each plug-in on the engine wiring harness. It can be clearly seen that a protective sleeve is made at the tail of them to protect them, and there is no leakage of wires. This may be a trend in the follow-up of wiring harnesses, and it is worth noting. In addition, at the place marked by the circle in the figure, a structure is made on the intake pipe to trap the wiring harness, which can effectively fix the direction of the wiring harness and prevent the wiring harness from shaking. A solution for routing the wiring harness to the hood. At present, I have never encountered the need to route it like this. I don't know what this function is. If you know, please tell me in the message area. Posted here is mainly to provide ideas for the next wiring. A long tubular columnar structure is made on the hood brace to fix the wiring harness, so that when it contracts, it can also drive the wiring harness to move together. Generally speaking, BMW has done a beautiful job where it is easy to see, but what about the internal wiring harness? I guess everyone will be a little speechless after reading it. It shows the wiring harness on the floor and door line. It can be clearly seen that BMW's wiring harness is wrapped very casually. Because it is covered with carpet, there is no more spit here. Actually, what I want to talk about is this flower wrapping scheme. It can be seen that flannel tape is used instead of ordinary PVC tape. Personally, I feel that it is from the perspective of lightweight. What do you think? Ceiling wiring harness, the fixing method of ceiling wiring harness is in the form of cable tie buckle, which is different from Geely Lynk & Co's ceiling wiring harness fixing scheme (sticky and ceiling interior). The bandaging scheme shown in the picture is fully wrapped with flannel. Summary: Finally, as before, please summarize the better aspects of BMW 3 Series wiring harness design and deepen your impression. Then we welcome everyone to discuss some questions in the article.

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