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.

Service check mode. (Check the navigation ECU)
1. NG : Troubleshoot for each diagnosis.
2. OK : Replace multi-display.
3. Ncon
Check the navigation ECU.
PREPARATION:

Disconnect the navigation ECU connector.

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 continuity terminal GND.

OK:
1. GND: Continuity
1. NG : Replace or repair wire harness or connector.
2. OK : Go to next step
Check wire harness and connector between multi display and navigation ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair or replace wire harness or connector.
2. OK : Check and replace multi display.