Rear View Monitor System Display Signal Circuit Between Radio And Display Assembly And Television Camera Assembly

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - REAR TELEVISION CAMERA ASSEMBLY)

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

CHECK REAR TELEVISION CAMERA ASSEMBLY

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Disconnect the R20 radio and display receiver assembly connector.
   

2. Disconnect the T39 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
   R20-7 (CA+) - T39-4 (CB+)	Always	Below 1 Ω
   R20-8 (V+) - T39-2 (CV+)	Always	Below 1 Ω
   R20-15 (CGND) - T39-3 (CGND)	Always	Below 1 Ω
   R20-16 (V-) - T39-1 (CV-)	Always	Below 1 Ω
   R20-7 (CA+) - Body ground	Always	10 kΩ or higher
   R20-8 (V+) - Body ground	Always	10 kΩ or higher
   R20-15 (CGND) - Body ground	Always	10 kΩ or higher
   R20-16 (V-) - Body ground	Always	10 kΩ or higher

1. Disconnect the R20 radio and display receiver assembly connector.
   

2. Measure the resistance according to the value(s) in the table below.
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   R20-16 (V-) - Body ground	Always	Below 1 Ω
   R20-15 (CGND) - Body ground	Always	Below 1 Ω

   Text in Illustration

   *a	Component without harness connected (Radio and Display Receiver Assembly)

1. Disconnect the T39 rear television camera assembly connector.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   T39-4 (CB+) - T39-3 (CGND)	Ignition switch ON, shift lever in R	5.5 to 7.05 V

   Text in Illustration

   *a	Front view of wire harness connector (to Rear Television Camera Assembly)

1. Using an oscilloscope, check the waveform.
   

   
   
   
   
   

   Text in Illustration

   *a	Component with harness connected (Radio and Display Receiver Assembly)	*b	Waveform 1
   *c	Waveform 2	*d	Synchronized Signal
   *e	Video Waveform	-	-

   HINT:

   A waterproof connector is used for the rear television camera assembly. Therefore, inspect the waveform at the radio and display receiver assembly with the connector connected.

   Measurement Condition

   Item	Content
   Terminal No. (Symbol)	R20-8 (V+) - R20-16 (V-)
   Tool Setting	0.2 V/DIV., 50 μs/DIV.
   Condition	Waveform 1: Ignition switch ON, shift lever in R Waveform 2: Ignition switch ON, shift lever in R, screen blacked out by covering camera lens

   OK:

   Waveform is as shown in the illustration.
   

   HINT:

   The video waveform changes according to the image sent by the rear television camera assembly.