Inspection Procedure

1. Disconnect the navigation ECU connector N3.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   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.
   Fig 1: Identifying N3 Navigation ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   Tester connection	Condition	Specified condition
   +B - GND1	Always	10 to 14 V
   ACC - GND1	Ignition switch ACC	10 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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