Toyota 4Runner: AVC-LAN Circuit

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Navigation / Multi Info Display / Navigation System / AVC-LAN Circuit

DESCRIPTION

Each unit of the navigation system connected to the AVC-LAN (communication bus) transfers the switch signals using the AVC-LAN.

If a short to +B or short to ground occurs in the AVC-LAN, the navigation system will not function normally because communication is not possible.

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.

HINT:

The navigation receiver assembly is the master unit.

PROCEDURE

1.	INSPECT NAVIGATION RECEIVER ASSEMBLY

(a) Disconnect the G37 navigation receiver assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G37-7 (TX1+) - G37-8 (TX1-)	Always	60 to 80 Ω

Text in Illustration

*a	Component without harness connected (Navigation Receiver Assembly)

REPLACE NAVIGATION RECEIVER ASSEMBLY

2.	CHECK HARNESS AND CONNECTOR (AVC-LAN CIRCUIT)

(a) Disconnect the G37 navigation receiver assembly connector.

(b) Disconnect the N11 stereo component amplifier assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N11-8 (TX+) - G37-7 (TX1+)	Always	Below 1 Ω
N11-7 (TX-) - G37-8 (TX1-)	Always	Below 1 Ω
N11-8 (TX+) - Body ground	Always	10 kΩ or higher
N11-7 (TX-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT MALFUNCTIONING PARTS

(a) Disconnect and reconnect each slave unit one by one until the master unit returns to normal operation.

HINT:

Check all slave units.
If disconnecting a slave unit causes the master unit to return to normal operation, the slave unit is defective and should be replaced.

OK:

Master unit returns to normal operation.

REPLACE MALFUNCTIONING PARTS

REPLACE NAVIGATION RECEIVER ASSEMBLY

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