Lexus NX: AVC-LAN Circuit

DESCRIPTION

Each audio system component connected to the AVC-LAN (communication bus) transfers switch signals using the audio visual communication local area network.

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

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the radio receiver assembly, always replace it with a new one.

If a radio receiver assembly which was installed to another vehicle is used, the following may occur:

  • A communication malfunction DTC may be stored.
  • The radio receiver assembly may not operate normally.

HINT:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

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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

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 I151 radio receiver assembly connector.

(b) Disconnect the I42 multi-display assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I151-5 (TX1+) - I42-7 (TX+)

Always

Below 1 Ω

I151-6 (TX1-) - I42-19 (TX-)

Always

Below 1 Ω

I151-5 (TX1+) - Body ground

Always

10 kΩ or higher

I151-6 (TX1-) - 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 operation.

HINT:

  • Check all slave units.
  • When disconnecting a slave unit causes the master unit to return to normal operation, this indicates that the slave unit is malfunctioning. Replace the malfunctioning slave unit.

OK:

Master unit returns to normal operation.

OK

REPLACE MALFUNCTIONING PARTS

NG

REPLACE RADIO RECEIVER ASSEMBLY

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