Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: AVC-LAN Circuit

Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual / Audio & Visual & Telematics / Audio / Video / Audio And Visual System (for 12.3 Inch Display) / AVC-LAN Circuit

DESCRIPTION

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

If a short to +B or short to ground occurs in the AVC-LAN, 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.

Click here

HINT:

The radio receiver assembly is the master unit.

PROCEDURE

1.

INSPECT RADIO RECEIVER ASSEMBLY

(a) Remove the radio receiver assembly.

Click here

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

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 J56 multi-display assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

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

Always

Below 1 Ω

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

Always

Below 1 Ω

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

    Data Signal Circuit between Radio Receiver and Stereo Jack Adapter
    DESCRIPTION The No. 1 stereo jack adapter assembly sends the sound data signal or image data signal from a USB device to the radio receiver assembly via this circuit. WIRING DIAGRAM PROCEDURE 1. ...

    Vehicle Speed Signal Circuit between Navigation ECU and Combination Meter
    DESCRIPTION The navigation ECU receives a vehicle speed signal from the combination meter assembly. HINT: A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter as ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Sfi System: Registration
    REGISTRATION CAUTION / NOTICE / HINT PROCEDURE 1. VIN (VEHICLE IDENTIFICATION NUMBER) NOTICE: The Vehicle Identification Number (VIN) must be written to a replacement ECM. HINT: The VIN is a 17-digit alphanumeric vehicle identification number. The Techstream is required to register the VIN. (a) DESC ...

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Rear Differential Carrier Assembly: Installation
    INSTALLATION CAUTION / NOTICE / HINT CAUTION: The rear differential carrier assembly with differential support is very heavy. Be sure to follow the procedure described in the repair manual, or the engine lifter may suddenly drop. NOTICE: If installing a new rear differential carrier assembly, remove ...

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

    © 2026 Copyright www.lexusrx.net
    0.0099