I tried this in the mechanical forum, but didn't get any replies that suggested anything I hadn't tried. I cannot reset the warning light . I have followed the instructions (hold down the trip/odometer reset button while turning on the power button) in all three modes: Trip A, Trip B and Odometer. According to Toyota, Trip A is the proper mode. In Trip A mode, and only in Trip A mode, briefly ----- appears, but instead of progressing like: ----, ---, --, -, it immediately goes back to the miles registered on Trip A. ??????