Toyota 4Runner: Sound Signal Circuit between Navigation Receiver Assembly and Stereo Jack Adapter

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Navigation / Multi Info Display / Navigation System / Sound Signal Circuit between Navigation Receiver Assembly and Stereo Jack Adapter

DESCRIPTION

The No. 1 stereo jack adapter assembly sends the sound signal from an external device to the navigation receiver assembly via this circuit.

The sound signal that has been sent is amplified by the stereo component amplifier assembly, and then is sent to the speakers.

If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assembly, DCM (telematics transceiver)*1 or speakers.

*1: w/ Manual (SOS) Switch

WIRING DIAGRAM

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - NO. 1 STEREO JACK ADAPTER ASSEMBLY)

(a) Disconnect the G37 navigation receiver assembly connector.

(b) Disconnect the G53 No. 1 stereo jack adapter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G37-25 (ADPG) - G53-9 (AUXO)	Always	Below 1 Ω
G37-26 (VAR+) - G53-6 (ARO)	Always	Below 1 Ω
G37-28 (VAL+) - G53-7 (ALO)	Always	Below 1 Ω
G37-27 (VA-) - G53-8 (ASGN)	Always	Below 1 Ω
G37-11 (AGND) - G53-10 (AGND)	Always	Below 1 Ω
G37-25 (ADPG) - Body ground	Always	10 kΩ or higher
G37-26 (VAR+) - Body ground	Always	10 kΩ or higher
G37-28 (VAL+) - Body ground	Always	10 kΩ or higher
G37-27 (VA-) - Body ground	Always	10 kΩ or higher
G37-11 (AGND) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Navigation Receiver Assembly)

Front view of wire harness connector

(to No. 1 Stereo Jack Adapter Assembly)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPAIR OR REPLACE HARNESS OR CONNECTOR

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