Inspection Procedure

1. Disconnect the navigation ECU connector L16.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   NAVIGATION ECU 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 

   NAVIGATION ECU VOLTAGE
   
   

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

Fig 1: Identifying Navigation ECU Connector L16

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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