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Home >> Lexus >> 2003 >> SC 430 >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> LEXUS Navigation System - Diagnosis >> Panel Switches Do Not Function >> Inspection Procedure

Inspection Procedure

  1. CHECK SWITCH(BEEP SOUND) 
    1. Check switch.
      1. Check that the beep sounds when touch switch is pressed.
    1. OK: CHECK AND REPLACE NAVIGATION ECU 
    2. NG: GO TO NEXT STEP 
  2. INSPECT MULTI-DISPLAY JUNCTION BLOCK 
    1. Check that the malfunction disappear when a know good multi-display junction block is installed.
    MALFUNCTION

    A B
    Malfunction does not disappear Malfunction disappear
    1. B: REPLACE MULTI-DISPLAY JUNCTION BLOCK 
    2. A: GO TO NEXT STEP 
  3. INSPECT COOLER WIRE NO. 1 (BETWEEN MULTI-DISPLAY JUNCTION BLOCK AND AIR CONDITIONING PANEL SUB-ASSY) 
    1. NG: REPLACE COOLER WIRE NO. 1 
    2. OK: 
  4. INSPECT COOLER WIRE NO. 1 (BETWEEN AIR CONDITIONING PANEL SUB-ASSY AND AIR CONDITIONER AMPLIFIER ASSY) 
    1. NG: REPLACE COOLER WIRE NO. 1 
    2. OK: GO TO NEXT STEP 
  5. INSPECT AIR CONDITIONING PANEL SUB-ASSY 
    1. Check that the malfunction disappear when a know good air conditioning panel sub-assy is installed.
    MALFUNCTION

    A B
    Malfunction does not disappear Malfunction disappear
    1. B: REPLACE AIR CONDITIONING PANEL SUB-ASSY 
    2. A: REPLACE AIR CONDITIONER AMPLIFIER ASSY 
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