2004 Toyota Sienna Owners Manual - Page 603
2004 Toyota Sienna Manual
Page 603 highlights
Sienna_Navi_U (L/O 0301) Auto reroute When the auto reroute feature is turned on, the system will automatically search for a new route to the destination if you leave the guidance route. This feature does not operate while you are driving on roads where the guidance is not available. 97 2004 SIENNA Navigation from Jan. '03 Prod. (OM45409U)