Navigation ECU Power Source Circuit: Wiring Diagram

1. Disconnect the navigation ECU connector p2.
2. Measure the resistance according to the value(s) in the table below.
   STANDARD RESISTANCE
   
   

   Tester connection	Condition	Specified condition
   GND1 - Body ground	Always	Below 1 Ω

3. Measure the voltage according to the value(s) in the table below.
   STANDARD VOLTAGE
   
   

   Tester connection	Condition	Specified condition
   +B - GND1	Always	10 to 14 V
   ACC - GND1	Engine switch on (ACC)	10 to 14 V

   Fig 2: Identifying Navigation ECU Connector p2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: GO TO STEP 2 

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

1. Disconnect the navigation ECU connector p2 and multi-display connector p1.
2. Measure the resistance according to the value(s) in the table below.
   STANDARD RESISTANCE
   
   

   Tester connection	Condition	Specified condition
   GND1 - GND2	Always	Below 1 Ω
   ACC - ACC2	Always	Below 1 Ω
   +B - +B	Always	Below 1 Ω
   GND1 - Body ground	Always	10 kΩ or higher
   ACC - Body ground	Always	10 kΩ or higher
   +B - Body ground	Always	10 kΩ or higher

   Fig 3: Identifying Navigation ECU Connector p2 And Multi-Display Connector p1

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE MULTI-DISPLAY