Display and Navigation Assembly Power Source Circuit: Procedure

1. Remove the ACC and ECU-IG No. 1 fuses from the cowl side junction block LH.
2. Remove the TV fuse from the cowl side junction block RH.
3. Measure the resistance of according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   ACC fuse	Always	Below 1 Ω
   ECU-IG No. 1 fuse	Always	Below 1 Ω
   TV fuse	Always	Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

1. Disconnect the F28 display connector.
   Fig 1: Identifying Display And Navigation Module Display Connector Terminals

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F28-10 (GND1) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F28-1 (+B1) - F28-10 (GND1)	Always	11 to 14 V
   F28-2 (ACC) - F28-10 (GND1)	Engine switch on (ACC)	11 to 14 V
   F28-3 (IG) - F28-10 (GND1)	Engine switch on (IG)	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   3