Toyota 4Runner: Display Signal Circuit between Navigation Receiver Assembly and Television Camera Assembly

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Park Assist / Monitoring / Rear View Monitor System(for Navigation Receiver Type) / Display Signal Circuit between Navigation Receiver Assembly and Television Camera Assembly

DESCRIPTION

This is the display signal circuit between the navigation receiver assembly and the television camera assembly.

WIRING DIAGRAM

PROCEDURE

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

(a) Disconnect the G38 navigation receiver assembly connector.

(b) Disconnect the Y2 rear television camera assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G38-11 (CA+) - Y2-6 (CB+)	Always	Below 1 Ω
G38-12 (V+) - Y2-3 (CV+)	Always	Below 1 Ω
G38-23 (CGND) - Y2-5 (CGND)	Always	Below 1 Ω
G38-24 (V-) - Y2-2 (CV-)	Always	Below 1 Ω
G38-11 (CA+) - Body ground	Always	10 kΩ or higher
G38-12 (V+) - Body ground	Always	10 kΩ or higher
G38-23 (CGND) - Body ground	Always	10 kΩ or higher
G38-24 (V-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK NAVIGATION RECEIVER ASSEMBLY

(a) Reconnect the G38 navigation receiver assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G38-23 (CGND) - Body ground	Always	Below 1 Ω
G38-24 (V-) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Condition	Specified Condition
G38-11 (CA+) - G38-23 (CGND)	Ignition switch ACC	5.5 to 7.05 V

Text in Illustration

*a	Component with harness connected (Navigation Receiver Assembly)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

3.	CHECK REAR TELEVISION CAMERA ASSEMBLY

(a) Reconnect the Y2 rear television camera assembly connector.

(b) Check the waveform of the rear television camera assembly using an oscilloscope.

HINT:

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

Text in Illustration

Component with harness connected

(Navigation Receiver Assembly)

Waveform 1 (under normal conditions)

Waveform 2 (camera lens is covered, blacking out the screen)

Synchronized Signal

Video Waveform

OK:

Waveform is as shown in the illustration.

Item	Content
Terminal No. (Symbol)	G38-12 (V+) - G38-24 (V-)
Tool Setting	200 mV/DIV., 50 μsec./DIV.
Condition	Ignition switch ON, shift lever in R

HINT:

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

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE REAR TELEVISION CAMERA ASSEMBLY

Back Camera Disconnected (C1622)

DESCRIPTION This DTC is stored if the navigation receiver assembly judges that the signals or signal lines between the navigation receiver assembly, and the rear television camera assembly are no ...

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