Inspection Procedure

1. Disconnect the navigation ECU connector L17 and multi-display connector E8.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   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 kΩ or higher
   G - Body ground	Always	10 kΩ or higher
   B - Body ground	Always	10 kΩ or higher
   SYNC - Body ground	Always	10 kΩ or higher
   VR - Body ground	Always	10 kΩ or higher
   VG - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 1: Checking Harness And Connector (Navigation ECU - Multi-Display)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step 

1. Reconnect the navigation ECU connector M17.
2. Measure the waveform according to the table below.

   Standard 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   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.

   Fig 2: Inspecting Navigation ECU (Output Signal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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 any waveform is output.
   1. Oscilloscope wave
      OSCILLOSCOPE WAVE REFERENCE
      
      

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

      Fig 3: Identifying Oscilloscope Wave

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Oscilloscope wave
      OSCILLOSCOPE WAVE REFERENCE
      
      

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

NG: REPLACE NAVIGATION ECU 

Fig 4: Identifying Oscilloscope Wave

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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