Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

Set volume to MAX in menu screen. Check that confirming voice can be heard.
1. OK : Normal. (Voice navigation is not available because no destination is set, or the vehicle is running off the route.
2. NG : Go to next step.
Check wire harness between navigation ECU and driver side door speaker.
PREPARATION:

Disconnect the navigation ECU connector and driver side door speaker connectors.

CHECK:
1. Check continuity of the wire harness between terminal AUO+ of the navigation ECU and terminal 1 of the driver side door speaker.
2. Check continuity of the wire harness between terminal AUO- of the navigation ECU and terminal 2 of the driver side door speaker.
OK:

Continuity
1. NG : Replace or repair wire harness or connector (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. OK : Go to next step.
Check sound. (Check if radio sound can be heard from driver side door speaker.)
1. OK : Replace navigation ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. NG : Replace speaker.