Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

CHECK VEHICLE SENSOR (NAVIGATION CHECK MODE)
1. Enter the Navigation Check mode's Vehicle Sensors (see NAVIGATION CHECK MODE ).
  
  Fig 1: Display Navigation Check Mode (Vehicle Sensors) Screen
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. While driving, compare the "SPD" indicator to the reading on the speedometer. Check if these readings are almost equal.
  OK:
  
  The readings are almost equal.
NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN DIAGNOSTIC TROUBLE CODE CHART

OK: REPLACE NAVIGATION ECU