Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

Check Wire Harness And Connector Between Radio Receiver Assembly And Navigation ECU . See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
1. OK: Go to next step.
2. NG: Repair or replace wire harness or connector between radio receiver assembly and navigation ECU.
Check Wire Harness And Connector Between Multi Display And Navigation ECU. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
1. OK: Go to next step.
2. NG: Repair or replace wire harness or connector between multi display and navigation ECU.
Skip Radio Receiver Assembly And Check AVC-LAN .
Preparation:
1. Connect Multi Display connector.
2. Disconnect radio receiver assembly "R4" connector.
3. Using SST (Navigation Check Wire P/N 09843-18050), connect the terminal TX+ to terminal TX- of "R4" connector of radio receiver assembly.
  
  Fig 1: Using Navigation Check Wire To Test Signal
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check:

Operate the panel switch and the touch switch of the display and check that the navigation functions.

(Check that AVC-LAN is recovered.)
1. OK: Replace the radio receiver assembly.
2. NG: Go to next step.
Replace The Navigation ECU .