LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2004 >> SC 430 >> Repair and Diagnosis >> External Pages >> Different car >> Section 329 (LEXUS Navigation System - Diagnosis) >> Circuit Inspection >> Touch Switch Does Not Function (A/C Control Screen Only) >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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.
  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: Go to next step 
  3. Check "Gateway ECU (AVC-LAN adopter) circuit" (See  Gateway ECU (AVC-LAN adapter) Circuit  ) 
    1. NG : Repair or replace wire harness and connector 
    2. OK : Check and replace A/C amplifier (Center ECU). 
scientia non olet · About LEMON Manuals