Navigation ECU Power Source Circuit: Procedure

1. Disconnect the navigation ECU connector.
   Fig 1: Identifying Terminals Of Multi-Display Connector

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2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   p2-15 (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
   p2-1 (+B) - p2-15 (GND1)	Always	11 to 14 V
   p2-13 (ACC) - p2-15 (GND1)	Engine switch on (ACC)	11 to 14 V

NG → See step   3 

OK → See step   2 

1. Disconnect the navigation ECU connector and multi-display connector.
   Fig 2: Identifying Terminals Of Navigation ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.
   Fig 3: Identifying Terminals Of Multi-Display Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   p2-15 (GND1) - p1-6 (GND2)	Always	Below 1 Ω
   p2-13 (ACC) - p1-7 (ACC2)	Always	Below 1 Ω
   p2-1 (+B) - p1-8 (+B)	Always	Below 1 Ω
   p2-15 (GND1) - Body ground	Always	10 kΩ or higher
   p2-13 (ACC) - Body ground	Always	10 kΩ or higher
   p2-1 (+B) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4