Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

NAVIGATION CHECK MODE (VEHICLE SENSORS)
1. Enter the "Navigation Check" mode (Vehicle Sensors) (see NAVIGATION CHECK MODE (VEHICLE SENSORS) ).
2. While driving, compare the "SPD" indicator to the reading on the speedometer. Check if these readings are almost the same.
  OK: The readings are almost the same.
  
  Fig 1: Identifying Multi-Display - Vehicle Sensors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK:

REPLACE NAVIGATION ECU (SEE REPLACEMENT )

NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN DIAGNOSTIC TROUBLE CODE CHART (SEE DIAGNOSTIC TROUBLE CODE CHART )