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 ).

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

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

B

REPLACE NAVIGATION RECEIVER ASSEMBLY

C

REPLACE NAVIGATION RECEIVER ASSEMBLY

A

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.

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

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

A

REPLACE MALFUNCTIONING PARTS

B

REPLACE NAVIGATION RECEIVER ASSEMBLY

C

REPLACE NAVIGATION RECEIVER ASSEMBLY

    Navigation System

    Stereo Component Amplifier Malfunction (B15A3)

    See More:

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