2012 Toyota Sienna Navigation Manual - Page 435

REAR VIEW MONITOR SYSTEM 5. Turn the steering wheel so that the vehicle width extension guide lines are parallel with the parking space lines. When the lines are parallel, straighten the steering wheel and back up slowly. Even if the distance guide line and the parking space rear edge appear to be parallel on the screen, in reality they may not be parallel. When there is only one line dividing the spaces in a parking lot, even if the vehicle width extension guide lines and the parking space right side (left side) appear to be parallel on the screen, in reality they may not be parallel. 248