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.

REMOVE OPTIONAL PARTS (CELLULAR MOBILE TELEPHONE)
1. Remove optional parts (Cellular mobile telephone).
  1. Disconnect the cellular mobile telephone wire harness.
  2. Connect the wire harness of the navigation system so that the cellular mobile telephone is not linked.
2. Check that the malfunction disappears when operating the navigation system again.
  
  Fig 1: Cellular Mobile Telephone Malfunction Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. A: Go to next step.
2. B: CHECK AND REPLACE TELEPHONE COMPUTER AND WIRE HARNESS
INSPECT NAVIGATION ECU (+B, ACC, GND)
1. Remove the navigation ECU with connectors still connected.
2. Check voltage.
  1. Measure voltage between terminals +B, ACC and GND of navigation ECU under each condition, as shown in Fig 2.
    
    Fig 2: +B, ACC and GND Terminal Specification Table - Navigation ECU
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  Voltage:
  
  Fig 3: Measuring Voltage Between Terminals +B, ACC & GND Of Navigation ECU
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check continuity.
  1. Check that the continuity exists between terminal GND of navigation ECU and body ground.
  Standard: Continuity exists
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: Go to next step.
INSPECT NAVIGATION ECU (SYNC, VR, VG)
1. Check signal waveform.
  1. Using an oscilloscope, check signal waveform between terminals SYNC and GND1 of navigation ECU.
    
    Fig 4: Oscilloscope Setting/Condition Table - Navigation ECU (Terminals SYNC and GND1)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 5: Oscilloscope Signal Waveform - ECU Connector Terminals SYNC & GND1
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 6: Identifying Navigation ECU Connector Terminals (SYNC, VR, VG)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check continuity.
  1. Check that the continuity exists between each terminals, as shown in Fig 7.
    
    Fig 7: Continuity Specification Table - ECU Connector Terminals (SYNC, VR, VG)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  Standard:
1. NG: CHECK AND REPLACE NAVIGATION ECU
2. OK: Go to next step.
INSPECT MULTI-DISPLAY (CRT DISPLAY) DISPLAY (SYNC, VR, VG)
1. Check signal waveform.
  1. Using an oscilloscope, check signal waveform between terminals SYNC and GND1 of multi-display.
    
    Fig 8: Oscilloscope Setting/Condition Table - Multi-Display (CRT Display) Display (Terminals SYNC and GND1)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 9: Oscilloscope Signal Waveform - Multi-Display (CRT Display) Terminals SYNC and GND1
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 10: Identifying Connector Terminals - Multi-Display (CRT Display) Display
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check continuity.
  1. Check that the continuity exists between each terminals, as shown in Fig 11.
  Standard:
  
  Fig 11: Terminal VR And VG Continuity Specifications - Multi-Display (CRT Display) Display
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. OK: CHECK AND REPLACE MULTI-DISPLAY (CRT DISPLAY) DISPLAY
2. NG: Go to next step.
CHECK HARNESS AND CONNECTOR (BETWEEN INSTRUMENT CLUSTER FINISH PANEL SUB-ASSY CENTER AND NAVIGATION ECU)
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: Go to next step.
CHECK HARNESS AND CONNECTOR (BETWEEN INSTRUMENT CLUSTER FINISH PANEL SUB-ASSY AND MULTI-DISPLAY)
1. NG: CHECK AND REPLACE INSTRUMENT CLUSTER FINISH PANEL SUB-ASSY CENTER
2. OK: CHECK AND REPLACE MULTI-DISPLAY (CRT DISPLAY) DISPLAY