Navigation ECU Power Source Circuit: Wiring Diagram

The wiring diagram is shown below.

Fig 1: Navigation ECU Power Source Circuit - Wiring Diagram (1 Of 2)

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Fig 2: Navigation ECU Power Source Circuit - Wiring Diagram (2 Of 2)

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1. CHECK MULTI-DISPLAY POWER SOURCE CIRCUIT 

   Refer to MULTI-DISPLAY POWER SOURCE CIRCUIT  .

   If the power source circuit is operating normally, proceed to the next step.

   NEXT 

2. CHECK MULTI-DISPLAY 
   1. Measure the voltage of the connector.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      h1-31 (+B) - Body ground	Always	10 to 14 V
      h1-14 (ADET) - Body ground	Engine switch on (ACC)	10 to 14 V

   2. Measure the resistance of the connector.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      h1-2 (GND) - Body ground	Always	Below 1 Ω

   NG : REPLACE MULTI-DISPLAY 

   Fig 3: Identifying Multi-Display

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPLACE NAVIGATION ECU