Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT NAVIGATION ECU (+B, ACC, GND, SENSE)
1. Check continuity between terminals at each condition, as shown in the chart.
  Standard:
  
  Fig 1: Inspecting Navigation ECU
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check voltage between terminals at each condition, as shown in the chart.
  Standard:
  
  Fig 2: Standard Tester Condition Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 3: Standard Tester Condition Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: GO TO NEXT STEP.

CHECK FOR PROBLEM SYMPTOMS TABLE

Check problem symptoms table.

PROBLEM SYMPTOMS TABLE - POWER SOURCE CIRCUIT (NAVIGATION ECU)

A	Check of suspected areas is finished
B	Suspected areas still exist

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE ( PROBLEM SYMPTOMS TABLE )
A: GO TO NEXT STEP.
CHECK AND REPLACE NAVIGATION ECU