I have a similar problem. Told that it was normal but our fleet of 6 identical toyota's do not suffer this vibration.
I used spectro graph on my phone and seem to get peaks at 61Hz and 123Hz which i guess relates to harmonics at 1800RPM.
I have considered taking to a dynatune type place but...
Yeah, I agree. However, for me I had already had all the panels off twice before to run various cables.
I had just put everything back together before I tackled the brake switch and it was only then I discovered the situation and couldn't bring myself to pull all the panels and seat belts off...
I am using a Prodigy P3 to control the current to the electric brakes and needed to access a signal that goes positive high (12V) when the brake is applied on an LC200 Series 2018
I decided to get dirty with a multimeter and the 5 pin brake switch connector and share my results.
The RED...
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