Inspection Procedure

1. Measure the voltage of the ECU connector.
   Fig 1: Identifying Navigation ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   N3-15 (MUT2) - N3-17 (GND1)	Voice guidance ON	Below 1 V

NG: REPLACE NAVIGATION ECU 

OK: Go to next step 

1. Disconnect the N3 ECU connector.
2. Disconnect the N6 amplifier connector.
   Fig 2: Identifying N6 Amplifier Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   N3-15 (MUT2) - N6-4 (NAVI)	Below 1 Ω
   N3-17 (GND1) - Body ground	Below 1 Ω
   N3-15 (MUT2) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to next step 

1. Measure the voltage of the amplifier connector.
   Fig 3: Identifying Navigation Amplifier Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   N6-11 (NAVO) - N6-8 (GND)	Voice guidance ON	Below 1 V

NG: REPLACE NAVIGATION AMPLIFIER 

OK: Go to next step 

1. Disconnect the N6 and S23 amplifier connectors.
   Fig 4: Identifying N6 And S23 Amplifier Connectors Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Specified Condition
   N6-11 (NAVO) - S23-9 (N-MU)	Below 1 Ω
   N6-8 (GND) - Body ground	Below 1 Ω
   N6-11 (NAVO) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

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