Display Signal Circuit between Navigation ECU and Multi-display Controller: Wiring Diagram

1. Disconnect the navigation ECU connector N2 and multi-display controller connector R26.
2. Measure the resistance according to the value(s) in the table below.

   Resistance 

   ECU CONNECTOR TERMINAL RESISTANCE SPECIFICATION
   
   

   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
   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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Identifying ECU Connector N2 And Multi-Display Controller Connector R26

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO NEXT STEP. 

1. Reconnect the navigation ECU connector N2.
2. Measure the waveform according to the table below.

   OK 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

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

   Fig 3: Identifying Multi-Display Controller Connector R26

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   The waveform pattern may differ from those shown in the illustrations below due to differences in oscilloscope setting. A normal navigation ECU operating condition can be determined if any waveform is output.

3. Oscilloscope waveform
   1. Terminal: SYNC - Body ground

      Setting: 500 mV/DIV 10 [mue] s/DIV

      Condition: Navigation display is ON.

   2. Terminal: R, G, B - Body ground

      Setting: 200 mV/DIV 10 [mue] s/DIV

      Condition: Navigation map is switched.

NG: REPLACE NAVIGATION ECU 

Fig 4: Identifying Oscilloscope Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: RETURN TO THE ORIGINAL INSPECTION FLOW BECAUSE THE CHECK RESULT IS NORMAL