Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus GS 430 and 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

Check the navigation ECU.
CHECK:

Check terminals +B.

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

Check terminal ACC when turn ignition switch ACC or ON position.

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

Check terminal SYNC, VR or VG.

OK:
1. SYNC, VR, VG: See " NAVIGATION ECU " of " TERMINALS OF ECU "
  1. NG : Replace the wire harness when all terminals are faulty. Replace the wire harness when the SYNC terminal is faulty.
  2. OK : Replace the multi display.