First this is my disclaimer... It took me three tries to get this done, but it worked with my car. When I put it into R it beeps only once. I got this from my friend with a Prius. 1. Power on (not necessarily Ready, IG-ON will do) 2. Set trip to ODO 3. Power off 4. Power on to Ready...

Stopped by my dealer (Tustin Lexus) and asked if they could disable the seatbelt and reverse beeps (the salesguy said "absolutely no way to disable the built-in safety features of the car" - more sales BS). Took about 10 minutes and they were happy to do it, especially the tech. It was the...