Lexus RX (RX 350L, RX450h) 2016-2025 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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HINT:

The radio receiver assembly is the master unit.

PROCEDURE

(a) Remove the radio 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 17 (TX2+) - 18 (TX2-) Always 60 to 80 Ω 5 (TX1+) - 6 (TX1-) Always 60 to 80 Ω

*a Component without harness connected (Radio Receiver Assembly)

NG

REPLACE RADIO RECEIVER ASSEMBLY

OK

(a) Disconnect the J148 radio receiver assembly connector.

(b) Disconnect the J156 stereo component amplifier assembly connector.

(c) Disconnect the J56 multi-display assembly connector.

(d) 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.

OK:

Master unit returns to normal.

OK

REPLACE MALFUNCTIONING PARTS

NG

REPLACE RADIO RECEIVER ASSEMBLY