Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: AVC-LAN Circuit

DESCRIPTION

The audio and visual system communicates with each device via AVC-LAN communication. If a malfunction such as a short in a communication line, short to +B or short to ground occurs in the AVC-LAN circuit, communication will stop and the audio and visual system will not operate correctly. The malfunctioning device can be identified if the system returns to normal when the malfunctioning device is disconnected from the AVC-LAN circuit.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed.

Click here

PROCEDURE

1.

REMOVE DEALER INSTALLED OPTIONAL DEVICES (AVC-LAN COMPATIBLE DEVICES)

(a) Disconnect the connector of each dealer installed optional device (AVC-LAN compatible device) and check if the malfunction continues.

Result

Proceed to

No dealer installed optional devices are installed

A

The malfunction reoccurs

The system returns to normal

B

B

REPLACE THE DEVICE (OR WIRE HARNESS)

A

2.

INSPECT RADIO & DISPLAY RECEIVER ASSEMBLY (TX1+, TX1-)

(a) Remove the radio and display receiver assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (TX1+) - 2 (TX1-)

Always

60 to 80 Ω

*a

Component without harness connected

(Radio and Display Receiver Assembly)

NG

REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (AVC-LAN CIRCUIT)

(a) Disconnect the I253 radio and display receiver assembly connector.

(b) Disconnect the I234 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

I253-1 (TX1+) - I234-8 (TX+)

Always

Below 1 Ω

I253-2 (TX1-) - I234-7 (TX-)

Always

Below 1 Ω

I253-1 (TX1+) or I234-8 (TX+) - Body ground

Always

10 kΩ or higher

I253-2 (TX1-) or I234-7 (TX-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK AVC-LAN COMPATIBLE DEVICES (DISCONNECT CONNECTOR)

(a) Disconnect the connector of each AVC-LAN connected device and check if the malfunction continues.

Result

Proceed to

The malfunction continues

A

The system returns to normal (AVC-LAN connected device was malfunctioning)

B

B

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

A

5.

INSPECT RADIO & DISPLAY RECEIVER ASSEMBLY (AVC-LAN VOLTAGE)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

I253-1 (TX1+) - I253-2 (TX1-)

ACC ON

Approximately 0 V

I253-1 (TX1+) - Body ground

ACC ON

Approximately 2.5 V

I253-2 (TX1-) - Body ground

ACC ON

Approximately 2.5 V

*a

Component with harness connected

(Radio and Display Receiver Assembly)

OK

REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR MALFUNCTIONING AVC-LAN CONNECTED DEVICE

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