REAR VIEW MONITOR SYSTEM > Display Signal Circuit between Radio and Display Assembly and Television Camera Assembly

for Preparation Click here


DESCRIPTION

The display signal from the rear television camera assembly transmits to the radio and display receiver assembly.

WIRING DIAGRAM


E224828E04


INSPECTION PROCEDURE

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

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

  1. Disconnect the T39 rear television camera assembly connector.

  1. 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


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    E224536E03

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

  1. 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)


NG
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY (Click here)
OK


3.CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY


    E227664E10

  1. Disconnect the T39 rear television camera assembly connector.

  1. 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)


NG
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY (Click here)
OK


4.CHECK REAR TELEVISION CAMERA ASSEMBLY


  1. Using an oscilloscope, check the waveform.


    E224537E03

    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.

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


NG
REPLACE REAR TELEVISION CAMERA ASSEMBLY (Click here)
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)