Toyota Tundra Service Manual: AVC-LAN Circuit

Toyota Tundra 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

HINT:

The navigation receiver assembly is the master unit.

PROCEDURE

1.	INSPECT NAVIGATION RECEIVER ASSEMBLY

(a) for Column Shift Type:

(1) Remove the navigation receiver assembly with the connector(s) still connected (See page ).

(b) for Floor Shift Type:

(1) Remove the navigation receiver assembly with the connector(s) still connected (See page ).

Standard Resistance:

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

Result

Result	Proceed to
OK	A
NG (for Column Shift Type)	B
NG (for Floor Shift Type)	C

REPLACE NAVIGATION RECEIVER ASSEMBLY

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

(a) Disconnect the J135 navigation receiver assembly connector.

(b) Disconnect the J141 stereo component amplifier assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
J141-8 (TX+) - J135-7 (TX1+)	Always	Below 1 Ω
J141-7 (TX-) - J135-8 (TX1-)	Always	Below 1 Ω
J141-8 (TX+) - Body ground	Always	10 kΩ or higher
J141-7 (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.

Result

Result	Proceed to
OK	A
NG (for Column Shift Type)	B
NG (for Floor Shift Type)	C

REPLACE MALFUNCTIONING PARTS

REPLACE NAVIGATION RECEIVER ASSEMBLY

Navigation System

Stereo Component Amplifier Malfunction (B15A3)

See More:

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