Inspection Procedure

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

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   z17-15 (GND1) - Body ground	Always	Below 1 Ω

3. Measure the voltage according to the value (s) in the table below.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   z17-1 (+B) - z17-15 (GND1)	Always	10 to 14 V
   z17-13 (ACC) - z17-15 (GND1)	Engine switch on (ACC)	10 to 14 V

   Fig 1: Identifying Navigation ECU Connector z17

   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 multi-display connector.
   Fig 2: Identifying Multi-Display Connector h1

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value (s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   h1-6 (GND) - z17-15 (GND1)	Always	Below 1 Ω
   h1-7 (ADET) - z17-13 (ACC)	Always	Below 1 Ω
   h1-8 (+B) - z17-1 (+B)	Always	Below 1 Ω
   h1-6 (GND) - Body ground	Always	10 kΩ or higher
   h1-7 (ADET) - Body ground	Always	10 kΩ or higher
   h1-8 (+B) - Body ground	Always	10 kΩ or higher

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 3: Identifying Navigation ECU Connector z17

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE MULTI-DISPLAY