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Home >> Lexus >> 2004 >> SC 430 >> Repair and Diagnosis >> External Pages >> Different car >> Section 474 (LEXUS Navigation System - Diagnosis) >> Circuit Inspection >> No navigation screen displayed when "MAP", "Menu", or "DEST" switch pressed. (Screen cannot be switched.) >> Inspection Procedure
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Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. Service check mode. (Check the navigation ECU) 
    1. NG: Troubleshoot for each diagnosis. 
    2. OK: Replace multi-display. 
    3. Ncon 
  2. Check the navigation ECU power source circuit (see  POWER SOURCE CIRCUIT (NAVIGATION ECU)  ). 
    1. NG: Replace or repair wire harness or connector. 
    2. OK: Go to next step 
  3. 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. 
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