Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: AVC-LAN Circuit

DESCRIPTION

Each unit of the audio and visual system connected to the AVC-LAN (communication bus) transmits signals via AVC-LAN communication.

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

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. Refer to Precaution for Audio and Visual System.

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• When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
  • A communication malfunction DTC may be stored.
  • The radio and display receiver assembly may not operate normally.

HINT:

The radio and display receiver assembly is the master unit.

PROCEDURE

(a) Remove the radio and display receiver assembly.

(b) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection Condition Specified Condition G3-5 (TX1+) - G3-6 (TX1-) Always 60 to 80 Ω

*a Component without harness connected (Radio and Display Receiver Assembly)

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

(a) Disconnect the G3 radio and display receiver assembly connector.

(b) Disconnect the G8 stereo component amplifier assembly connector.

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

Standard Resistance:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

HINT:

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

OK:

Master unit returns to normal.

OK

REPLACE MALFUNCTIONING PARTS

NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY