Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: AVC-LAN Circuit

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Audio & Visual & Telematics / Audio / Video / Audio And Visual System (for 8 Inch Display) / 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

1.

INSPECT RADIO RECEIVER ASSEMBLY

(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

2.

CHECK HARNESS AND CONNECTOR (AVC-LAN CIRCUIT)

(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:

Tester Connection

Condition

Specified Condition

J148-17 (TX2+) - J156-8 (TX+)

Always

Below 1 Ω

J148-18 (TX2-) - J156-7 (TX-)

Always

Below 1 Ω

J148-5 (TX1+) - J56-7 (TX+)

Always

Below 1 Ω

J148-6 (TX1-) - J56-19 (TX-)

Always

Below 1 Ω

J148-17 (TX2+) or J156-8 (TX+) - Body ground

Always

10 kΩ or higher

J148-18 (TX2-) or J156-7 (TX-) - Body ground

Always

10 kΩ or higher

J148-5 (TX1+) or J56-7 (TX+) - Body ground

Always

10 kΩ or higher

J148-6 (TX1-) or J56-19(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.

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 RECEIVER ASSEMBLY

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