USB Coding Acoustical Lock Confirm HU_NBT EVO: Solving BMW Beep Issues with FZD_35 Unit
Experiencing trouble with your BMW’s lock/unlock beep confirmation? Many BMW owners rely on this audible cue to ensure their vehicle is securely locked. If you’ve noticed this feature has stopped working, you’re not alone. This article delves into a specific solution involving the FZD_35 control unit and USB coding, particularly relevant for BMW models with HU_NBT EVO systems.
Recently, a BMW owner encountered this exact problem: the lock/unlock beep was absent. Despite the seemingly straightforward nature of this setting, the root cause was surprisingly located in an unexpected module – the Headliner control unit, also known as FZD_35. This unit, primarily responsible for interior roof lighting, also governs the acoustical lock confirmation feature.
Through diligent troubleshooting and expert guidance, it was discovered that replacing and reprogramming the FZD_35 control unit rectified the issue. Furthermore, updating the software to the latest version (11/2022 in this case) was part of the successful resolution. After these steps, the lock/unlock beep was restored to its proper function.
It’s a common misconception that the interior roof light module would control an audible lock confirmation. However, BMW’s system architecture designates the FZD_35 unit for this function. This is officially documented on platforms like the Bimmercode app website, which provides coding options for BMW vehicles. Specifically, Bimmercode highlights the “Roof Function Center” FZD__35 control unit as the key to enabling or disabling the acoustical lock/unlock confirmation.
Within the iDrive system settings, there is typically a checkbox to control the acoustical lock confirmation under the doors/keys menu. However, if this checkbox is unresponsive or unselectable, it’s crucial to verify the “Acoustical lock/unlock confirmation” setting within the FZD_35 control unit itself. According to Bimmercode’s information, this setting in the FZD_35 unit must be set to “Active” for the iDrive checkbox to function correctly. It’s also important to note that the vehicle must be equipped with an alarm system for this feature to be available.
The root cause in some cases, including the one mentioned earlier, might be an inactive setting within an older FZD_35 control unit. Replacing it with a new unit, which defaults to the active setting, resolves this discrepancy. While the precise reason for this unexpected behavior in older units remains unclear, the solution is proven and effective.
In conclusion, if you’re facing a non-functional lock/unlock beep on your BMW with HU_NBT EVO, investigating and potentially replacing the FZD_35 control unit, coupled with reprogramming and software updates, is a viable solution. This approach, often involving USB coding for configuration, directly addresses the control module responsible for this seemingly unrelated vehicle function.
