Display Signal Circuit between Navigation ECU and Radio Receiver: Procedure

1. Disconnect the H1 radio receiver assembly connector.
2. Disconnect the H3 display and navigation module display connector.
3. Measure the resistance according to the value(s) in the table below.
   STANDARD RESISTANCE
   
   

   Tester Connection	Condition	Specified Condition
   H1-8 (NTSC) - H3-9 (VV+)	Always	Below 1 Ω
   H1-22 (GND) - H3-20 (VV-)	Always	Below 1 Ω
   H1-8 (NTSC) - Body ground	Always	10 kΩ or higher
   H1-22 (GND) - Body ground	Always	10 kΩ or higher
   H1-7 (SLD) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Using an oscilloscope, check the waveform between each terminal and the body ground according to the conditions shown in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   STANDARD
   
   

   Tester Connection	Condition	Specified Condition
   H1-8 (NTSC) - Body ground	Radio receiver is playing, image is being produced	Waveform synchronized with image is output

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Radio Receiver Assembly)

NG → See step   3 

OK → See step   4