Inspection Procedure

1. Disconnect the navigation ECU connector N2 and multi-display controller sub-assy connector R25.
2. Measure the resistance according to the value(s) in the table below.

   Standard: 

   NAVIGATION ECU CONNECTOR AND MULTI-DISPLAY CONTROLLER SUB-ASSY CONNECTOR TERMINALS RESISTANCE
   
   

   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 around	Always	10 kΩ or higher

   Fig 1: Disconnecting Navigation ECU Connector N2

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   Fig 2: Disconnecting Multi-Display Controller Sub-Assy Connector R25

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1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. OK: Go to next step. 

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

   Standard: 

   TESTER CONNECTION AND 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: Disconnecting Multi-Display Controller Sub-Assy Connector R25

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1. NG: REPLACE NAVIGATION ECU (SEE  NAVIGATION ECU  ) 
2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

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.

Oscilloscope wave

Terminal: SYNC-Body ground

Setting: 500 mV/DIV 10 mus/DIV

Condition: Navigation display is ON.

Fig 4: Oscilloscope Waveform Graph (1 Of 2)

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Oscilloscope wave

Terminal: R, G, B-Body ground

Setting: 200 mV/DIV 10 mus/DIV

Condition: Navigation map is switched.

Fig 5: Oscilloscope Waveform Graph (2 Of 2)

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