Lexus ES manuals

Lexus ES: AVC-LAN Circuit

DESCRIPTION

Each unit of the navigation 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 navigation 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 Navigation System.

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  • 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:

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

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 G5 radio receiver assembly connector.

(b) Disconnect the G22 multi-display assembly connector.

(c) Disconnect the G23 air conditioning control assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G5-5 (TX1+) - G22-7 (TX+)

Always

Below 1 Ω

G5-6 (TX1-) - G22-19 (TX-)

Always

Below 1 Ω

G5-5 (TX1+) or G22-7 (TX+) - Body ground

Always

10 kΩ or higher

G5-6 (TX1-) or- G22-19 (TX-) - Body ground

Always

10 kΩ or higher

G22-6 (TX1+) - G23-1 (TX1+)

Always

Below 1 Ω

G22-18 (TX1-) - G23-2 (TX1-)

Always

Below 1 Ω

G22-6 (TX1+) or G23-1 (TX1+) - Body ground

Always

10 kΩ or higher

G22-18 (TX1-) or G23-2 (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.

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 return to normal.

OK

REPLACE MALFUNCTIONING PARTS

NG

REPLACE RADIO RECEIVER ASSEMBLY

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