Inspection Procedure

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

   Standard resistance 

   RESISTANCE REFERENCE
   
   

   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 

   VOLTAGE SPECIFICATION
   
   

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

   Fig 1: 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 

   RESISTANCE REFERENCE
   
   

   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 2: 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