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.

Check the navigation ECU.
CHECK:

Check voltage terminal +B.

OK:
1. +B: 10 - 14 V
CHECK:

Check voltage terminal ACC when turning the ignition switch to ACC or ON position.

OK:
1. ACC: 10 - 14 V
CHECK:

Check voltage terminals SYNC, VR or VG.

OK:
1. SYNC, VR, VG: See of
1. NG : Repair or replace the wire harness when all terminals are faulty. Replace the navigation ECU when the SYNC terminal is faulty.
2. OK : Replace the multi-display.