GoodRevs

Maybe once a year, if that, I’ll get a message on both the dash and center console that says “Blind Spot Monitor System - A malfunction in the Blind Spot Monitor System has been detected.” After restarting it goes away and doesn’t come back. However its come on four times in the past two weeks. I have an extended Lexus warranty so I’m not worried about it and already have an appt. booked, but I am curious how common this is and what the cause has been found to be for others? Thanks

JUTMSS32

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NJLEXES

I had the same problem with my 2017 GS AWD. It happened a few times over a few years mostly at idling or when the car was stopped. Initially they thought it might be older car battery & I replaced it at 4.5 years old. However it kept happening.
Most recently, My dealer did a deep dive on it and noticed there was a voltage drop every time it threw a code for the BSM. They narrowed it down to the SPIRAL CABLE in the steering wheel where it was losing contact causing the voltage drop.
They've since replaced it and it's been good so far. Time will tell.

Hope this info helps you.

GoodRevs

Very insightful, thank you. Hopefully whatever the cause is of my issue isn’t as difficult to diagnose!