1. Power on (not neccesarily ready, IG-ON will do).
2. Set Trip/ODO to ODO
3. Power off.
4. Power on to ready (brake on).
5. Within 6 seconds, press and hold ODO for 10 seconds or more.
6. WHILE STILL HOLDING ODO *after* 10 seconds, Shift from P to R, then back to P. Now release ODO.
7. You'll see in the trip pisplay "b on" or "b off".
8. Press ODO to toggle.
9. Now power off.

Now the car shouldn't beep when you're in reverse.