Navigation ECU Power Source Circuit: Procedure

1. Disconnect the navigation ECU connector p2.
   Fig 1: Identifying Navigation ECU Connector P2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   GND - 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
   BU+B - GND	Always	10 to 14 V
   ACC - GND	Engine switch on (ACC)	10 to 14 V

NG → See 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.
   Fig 2: Identifying Navigation ECU Connector P2 And Multi-Display Connector P1

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   GND - GND	Always	Below 1 Ω
   ACC - ACC	Always	Below 1 Ω
   BU+B - BU+B	Always	Below 1 Ω
   GND - Body ground	Always	10 kΩ or higher
   ACC - Body ground	Always	10 kΩ or higher
   BU+B - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MULTI-DISPLAY