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Home >> Lexus >> 2005 >> GX 470 >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (LEXUS Navigation System - Diagnostics) >> Circuit Inspection >> 18. Panel Switch Does Not Function (A/C control only) >> Inspection Procedure
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Inspection Procedure

WARNING: This page is about a different car, the 2005 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. Display check mode (Panel Switch Check 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 for open and short in harness and connector between gateway ECU and multi-display. 
    1. NG: Repair or replace wire harness and connector. 
    2. OK: Check and replace A/C amplifier (Center ECU). 
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