We see the hyper-flashing issue on vehicle's like your 2009 BMW X6 that are towing trailer's with LED lights.
One option to solve the issue is to use the adapter # 20142 which is the easiest way.
The second is to install load resistors, like # DI34ZR.
The reason you experience hyperflash is because of the low draw from LED lights. Both solutions build resistance in the line to solve the hyperflash problem. view full answer...
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