Hey everyone,

A while back, there was a posting on how to access a diagnostic menu via the "Display" menu, by touching the corners of the screen alternately. This takes you to a menu where you can access some of the Navigation system info.

One of these screens is called vehicle sensors if I recall correctly, and it shows you your current speed, and a "pulse count" that continually counts upward. I think people had speculated that this is the speed being reported by the GPS unit, but I am not convinced that this is true. I think it is the actual wheel speed sensor, which doesn't show the error that the speedo shows. Mine is off by about 5 miles per hour while I am at about 70mph.

Does anyone have documentation that this sensor reading is GPS based or wheel speed based?

Here is a link to another thread showing how to access this screen. The one that I am referring to is under the Navigation Check button, then there is a Vehicle Sensors button you press.

You can get out of the diagnostics screens by pressing the display button and holding it for about 5 seconds. This "reboots" the nav system and brings you back to the toyota logo screen.

Thanks!