Toyota Tundra Service Manual: 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

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:

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

REPLACE MALFUNCTIONING PARTS

REPLACE NAVIGATION RECEIVER ASSEMBLY

Toyota Tundra Service Manual > Audio And Visual System: Sound Quality is Bad Only when Disc is Played (Volume is Too Low)
PROCEDURE 1. REPLACE DISC WITH ANOTHER AND RECHECK (a) Replace the disc with a known good one and check that the malfunction disappears. OK: Malfunction disappears. Result Result Proceed to OK A NG (for Column Shift Type) B NG (for Floor Shift Type) C A END (DISC IS DEFECTIVE) B REPLACE RADIO AND DI ...

Toyota Tundra Owners Manual