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 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.

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

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

    Mute Signal Circuit between Stereo Component Amplifier and Telematics Transceiver
    DESCRIPTION The DCM (telematics transceiver) sends a mute signal to the stereo component amplifier assembly. The stereo component amplifier assembly controls the volume according to the mute signal fr ...

    Vehicle Speed Signal Circuit between Stereo Component Amplifier and Combination Meter
    DESCRIPTION The stereo component amplifier assembly receives a vehicle speed signal from the combination meter assembly to control the ASL function. HINT: A voltage of 12 V or 5 V is output from ea ...

    Other materials:

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Lighting System (w/ Automatic Headlight Beam Level Control System): Lost Communication With ECM/PCM "A" (U0100,...,U1126)
    DESCRIPTION These DTCs are stored if a CAN communication malfunction occurs between the main body ECU (multiplex network body ECU) and other ECUs. DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from U0100 Lost Communication With ECM/PCM "A" The main body EC ...

    Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual > Intuitive Parking Assist System (w/ Intelligent Clearance Sonar System): Rear Left Sensor Malfunction (C1AE6)
    DESCRIPTION The rear corner ultrasonic sensor LH is installed to the rear bumper. The clearance warning ECU assembly detects obstacles based on signals received from the rear corner ultrasonic sensor LH. If the rear corner ultrasonic sensor LH has an open circuit or other malfunction, it will not fu ...

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

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

    © 2026 Copyright www.lexusrx.net
    0.011