Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

Replace microphone (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. OK: Go to next step
Check overhead J/B. (See INSPECTION )
1. NG : Replace overhead J/B (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
2. OK: Go to next step
Check wire harness between overhead J/B (microphone) and navigation ECU.
PREPARATION:

Disconnect the overhead J/B and navigation ECU connectors.

CHECK:

Check continuity of the wire harness between terminals of the overhead J/B and those of the navigation ECU.

OK:
1. Continuity
1. NG : Replace or repair wire harness or connector.
2. OK : Check and replace navigation ECU.