Navigation ECU Communication Stop Mode: Procedure

1. Turn the engine switch off.
2. Disconnect the display and navigation module display connector.
   Fig 1: Display & Navigation Module Display (Navigation ECU) Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Display and Navigation Module Display)

3. Measure the resistance according to the value(s) in the table below.
   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   J50-21 (CANH) - J50-22 (CANL)	Engine switch off	54 to 69 Ω

NG → REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY BRANCH WIRE) 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 2: J50 Connector Terminal Identification

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   J50-10 (GND1) - Body ground	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Display and Navigation Module Display)

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

   Tester Connection	Condition	Specified Condition
   J50-1 (+B1) - Body ground	Always	11 to 14 V
   J50-2 (ACC) - Body ground	Engine switch on (ACC)	11 to 14 V
   J50-3 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

   RESULT
   
   

   OK (w/ Navigation system)	A
   OK (w/o Navigation system with multi-display)	B
   NG	C

B → See step   4 

C → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

A → See step   3