Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

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.
INSPECT MULTI-DISPLAY JUNCTION BLOCK
1. Check that the malfunction disappear when a know good multi-display junction block is installed.
  
  Fig 1: Malfunction Table - Multi-Display Junction Block
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. A: Go to next step.
2. B: REPLACE MULTI-DISPLAY JUNCTION BLOCK
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: Go to next step.
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.
INSPECT AIR CONDITIONING PANEL SUB-ASSY
1. Check that the malfunction disappear when a know good air conditioning panel sub-assy is installed.
  
  Fig 2: Malfunction Table - Air Conditioning Panel Sub-Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. A: REPLACE AIRCONDITIONER AMPLIFIER ASSY
2. B: REPLACE AIR CONDITIONING PANEL SUB-ASSY