Inspection Procedure

1. Disconnect the navigation ECU connector L17 and multi-display connector E8.
Fig 1: Identifying Navigation ECU Connector L17 And Multi-Display Connector E8
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2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   NAVIGATION ECU - MULTI-DISPLAY
   
   

   Tester connection	Condition	Specified condition
   R - R	Always	Below 1 Ω
   G - G	Always	Below 1 Ω
   B - B	Always	Below 1 Ω
   SYNC - SYNC	Always	Below 1 Ω
   VR - VR	Always	Below 1 Ω
   VG-VG	Always	Below 1 Ω
   R - Body ground	Always	10 Ω or higher
   G - Body ground	Always	10 Ω or higher
   B - Body ground	Always	10 Ω or higher
   SYNC - Body ground	Always	10 Ω or higher
   VR - Body ground	Always	10 Ω or higher
   VG - Body ground	Always	10 Ω or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Reconnect the navigation ECU connector M17.
Fig 2: Identifying Navigation ECU Connector E8
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the waveform according to the table below.

   Standard 

   NAVIGATION ECU (OUTPUT SIGNAL)
   
   

   Tester connection	Condition	Specified condition
   R - Body ground	Navigation display is ON.	A waveform synchronized with display signals is output.
   G - Body ground	Navigation display is ON.	A waveform synchronized with display signals is output.
   B - Body ground	Navigation display is ON.	A waveform synchronized with display signals is output.
   SYNC - Body ground	Navigation display is ON.	A waveform synchronized with display signals is output.

   HINT:

   • If SYNC signals are not being input to the multi-display due to an open circuit or other causes, the green initial screen may seem pinkish-green.
   • The waveform pattern may differ from those shown in the illustrations below due to differences in oscilloscope settings. A normal navigation ECU operating condition can be determined if arty waveform is output.
   1. Oscilloscope wave
      OSCILLOSCOPE WAVE REFERENCE (SYNC - BODY GROUND)
      
      

      Terminals	SYNC - Body ground
      Setting	500 mV/DIV 10 sμ/DIV
      Condition	Navigation display is on.

      Fig 3: Identifying Oscilloscope Waveform

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Oscilloscope wave
      OSCILLOSCOPE WAVE REFERENCE (R, G, B - BODY GROUND)
      
      

      Terminals	R, G, B - Body ground
      Setting	200 mV/DIV 10 sμ/DIV
      Condition	Navigation display is on.

      Fig 4: Identifying Oscilloscope Waveform

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE NAVIGATION ECU 

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE