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Home >> Lexus >> 2004 >> GS 430 >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> LEXUS Navigation System >> Circuit Inspection >> 18. Panel Switch Does Not Function (A/C control only) >> Inspection Procedure

Inspection Procedure

  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 multiplex communication circuit (See  HOW TO PROCEED WITH TROUBLESHOOTING  ). 
    1. NG: Replace or repair multiplex communication circuit. 
    2. OK: Replace A/C amplifier 
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