Toyota 4Runner: Data Signal Circuit between Radio Receiver and Extension Module

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Audio / Video / Audio And Visual System / Data Signal Circuit between Radio Receiver and Extension Module

DESCRIPTION

The stereo component tuner assembly sends the sound data signal or image data signal from a device to the radio and display receiver assembly via this circuit.

WIRING DIAGRAM

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - STEREO COMPONENT TUNER ASSEMBLY)

(a) Disconnect the s5 and t3 radio and display receiver assembly connectors.

(b) Disconnect the s2 and t2 stereo component tuner assembly connectors.

Standard Resistance:

Tester Connection	Condition	Specified Condition
s5-1 (USV4) - s2-1 (USV4)	Always	Below 1 Ω
s5-2 (US4-) - s2-2 (US4-)	Always	Below 1 Ω
s5-3 (US4+) - s2-3 (US4+)	Always	Below 1 Ω
s5-4 (UGD4) - s2-4 (UGD4)	Always	Below 1 Ω
s5-5 (USG4) - s2-5 (USG4)	Always	Below 1 Ω
t3-4 (+B2) - t2-4 (+B2)	Always	Below 1 Ω
t3-3 (ACC2) - t2-3 (ACC2)	Always	Below 1 Ω
t3-8 (GND2) - t2-8 (GND2)	Always	Below 1 Ω
s5-1 (USV4) - Body ground	Always	10 kΩ or higher
s5-2 (US4-) - Body ground	Always	10 kΩ or higher
s5-3 (US4+) - Body ground	Always	10 kΩ or higher
s5-4 (UGD4) - Body ground	Always	10 kΩ or higher
s5-5 (USG4) - Body ground	Always	10 kΩ or higher
t3-4 (+B2) - Body ground	Always	10 kΩ or higher
t3-3 (ACC2) - Body ground	Always	10 kΩ or higher
t3-8 (GND2) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS AND CONNECTOR

2.	REPLACE NO. 1 NAVIGATION WIRE

(a) Replace the No. 1 navigation wire (See page ).

(b) Check that the malfunction disappears.

OK:

Malfunction disappears.

END (NO. 1 NAVIGATION WIRE IS DEFECTIVE)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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