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

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Navigation / Multi Info Display / Navigation System / Data Signal Circuit between Navigation Receiver Assembly and Extension Module

DESCRIPTION

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

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

After replacing the navigation receiver assembly of vehicles subscribed to pay-type satellite radio broadcasts, registration of the XM radio ID is necessary.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - STEREO COMPONENT TUNER ASSEMBLY)

(a) Disconnect the s1 and t1 navigation receiver assembly connectors.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

s1-1 (USV4) - s2-1 (USV4)

Always

Below 1 Ω

s1-2 (US4-) - s2-2 (US4-)

Always

Below 1 Ω

s1-3 (US4+) - s2-3 (US4+)

Always

Below 1 Ω

s1-4 (UGD4) - s2-4 (UGD4)

Always

Below 1 Ω

s1-5 (USG4) - s2-5 (USG4)

Always

Below 1 Ω

t1-4 (+B2) - t2-4 (+B2)

Always

Below 1 Ω

t1-3 (ACC2) - t2-3 (ACC2)

Always

Below 1 Ω

t1-8 (GND2) - t2-8 (GND2)

Always

Below 1 Ω

s1-1 (USV4) - Body ground

Always

10 kΩ or higher

s1-2 (US4-) - Body ground

Always

10 kΩ or higher

s1-3 (US4+) - Body ground

Always

10 kΩ or higher

s1-4 (UGD4) - Body ground

Always

10 kΩ or higher

s1-5 (USG4) - Body ground

Always

10 kΩ or higher

t1-4 (+B2) - Body ground

Always

10 kΩ or higher

t1-3 (ACC2) - Body ground

Always

10 kΩ or higher

t1-8 (GND2) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

2.

REPLACE NO. 1 NAVIGATION WIRE

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


(b) Check that the malfunction disappears.

OK:

Malfunction disappears.


OK

END (NO. 1 NAVIGATION WIRE IS DEFECTIVE)


NG

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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