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Home >> Lexus >> 2003 >> SC 430 >> Repair and Diagnosis >> External Pages >> Different car >> Section 516 (LEXUS Navigation System - Diagnosis) >> Circuit Inspection >> Touch switch does not function. (Navigation screen only) >> 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. Display check mode (Touch switch, Touch point screen). 
    1. NG: Replace the multi-display. 
    2. OK: Go to next step 
  2. Check "AVC-LAN communication circuit". (See  AVC-LAN (COMMUNICATION BUS) CIRCUIT  ) 
    1. NG: Replace or repair AVC-LAN circuit. 
    2. OK: Replace the navigation ECU. 
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