Display Signal Circuit between Navigation Receiver Assembly and Television Camera Assembly: Procedure

1. Disconnect the G20 navigation receiver assembly connector.
2. Disconnect the Y1 rear television camera assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G20-22 (V+) - Y1-2 (CV+)	Always	Below 1 Ω
   G20-23 (V-) - Y1-1 (CV-)
   G20-21 (CGND) - Y1-3 (CGND)
   G20-24 (CA+) - Y1-4 (CB+)
   G20-22 (V+) - Body ground	Always	10 kΩ or higher
   G20-23 (V-) - Body ground
   G20-21 (CGND) - Body ground
   G20-24 (CA+) - Body ground

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Navigation Receiver Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   G20-24 (CA+) - G20-21 (CGND)	Ignition switch ON, shift lever in R	5.5 to 7.05 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Navigation Receiver Assembly)

NG → See step   5 

OK: Go to next step 

1. Using an oscilloscope, check the waveform.
   Fig 2: Identifying Connector Terminals & Waveform Diagram

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a

   Component with harness connected (Navigation Receiver Assembly)

   -

   -

   MEASUREMENT CONDITION
   
   

   Item	Content
   Terminal No. (Symbol)	G20-22 (V+) - G20-23 (V-)
   Tester Range	0.2 V/DIV., 50 μsec./DIV.
   Condition	Ignition switch ON, shift lever in R*1 Ignition switch ON, shift lever in R, screen blacked out by covering camera lens*2

   OK

   Waveform is as shown in the illustration above.

NG → See step   6 

OK → See step   4