Inspection Procedure

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

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   z22-15 (GND1) - Body ground	Always	Below 1 Ω

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

   Standard voltage 

   STANDARD VOLTAGE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   z22-1 (+B) - z22-15 (GND1)	Always	10 to 14 V
   z22-13 (ACC) - z22-15 (GND1)	Power switch on (ACC)	10 to 14 V

Fig 1: Identifying Z22 Navigation ECU Connector
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 H1 Multi-Display Connector

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

   Standard resistance 

   STANDARD RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   h1-6 (GND) - z22-15 (GND1)	Always	Below 1 Ω
   H1-7 (ADET) - z22-13 (ACC)	Always	Below 1 Ω
   h1-8 (+B) - 222-1 (+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

Fig 3: Identifying Z22 Navigation ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE MULTI-DISPLAY