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What are the causes of BMW BSD bus communication failure?

2 Answers

SanLilliana

09/01/25 2:53am

BMW BSD bus communication failure is mainly caused by low voltage, requiring inspection of the generator, current sensor, water pump, engine, and oil hydraulic sensor. Below is relevant information about BMW BSD: Concept of automotive BSD: Automotive BSD refers to the Blind Spot Detection system. Safety enhancement capability: The blind spot monitoring system can improve vehicle safety by reducing the likelihood of collision accidents during lane changes. The reason collisions are prone to occur during lane changes is that car rearview mirrors have blind spots. When a vehicle is in the blind spot, it cannot be seen through the rearview mirror, and lane changing under such circumstances may lead to traffic accidents. Accident prevention: The blind spot monitoring system is commonly used during lane changes, reversing out of parking spaces, driving in rainy or foggy conditions with blurred rearview mirrors, and when dazzled by high beams from behind at night. Particularly during rainy days and nighttime driving when rearview mirror visibility is poor, the system significantly helps prevent traffic accidents.

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StValerie

09/13/25 5:49am

I've been repairing cars for many years and often encounter BMW BSD bus communication failures, which are quite common. There are several main reasons: poor contact in the bus lines, especially loose connectors or corroded/aged wires, which are prone to rust in humid or water-soaked areas during summer; damaged termination resistors, which is not uncommon in CAN bus systems—faulty resistors can affect signal transmission; control module failures, such as a faulty engine management module or other sensor ECUs, which can disrupt the entire network; software needing updates, as BMW's newer systems sometimes throw errors if the firmware is outdated; and voltage issues, where low battery voltage or unstable alternator output can interrupt bus communication. To address this issue, I usually start by scanning for error codes with a diagnostic tool to identify which node is offline, then systematically test wire continuity and resistance values. Don't take it lightly, as it can affect the entire vehicle's functionality. I recommend finding a reliable shop for inspection and avoiding tampering with the wiring yourself to prevent short circuits and further complications.

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