AVC-LAN Circuit [09/2022 - ]: Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 350, 2024 Lexus ES 300h, 2024 Lexus ES 250, 2023 Lexus ES 350, and 2023 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
- REMOVE DEALER INSTALLED OPTIONAL DEVICES (AVC-LAN COMPATIBLE DEVICES)
- Disconnect the connector of each dealer installed optional device (AVC-LAN compatible device) and check if the malfunction continues.
Result
Result Proceed to No dealer installed optional devices are installed A The malfunction reoccurs The system returns to normal B
Result:
B
REPLACE THE DEVICE (OR WIRE HARNESS)
Result:
A
See step 2
- Disconnect the connector of each dealer installed optional device (AVC-LAN compatible device) and check if the malfunction continues.
- INSPECT RADIO RECEIVER ASSEMBLY
- Remove the radio receiver assembly.
Refer to REMOVAL [09/2022 - ]
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 7 (TX2+) - 8 (TX2-) Always 60 to 80 Ω 1 (TX1+) - 2 (TX1-) Always 60 to 80 Ω *a Component without harness connected
(Radio Receiver Assembly)Result
Proceed to OK NG
Result:
NG
REPLACE RADIO RECEIVER ASSEMBLY. Refer to REMOVAL [09/2022 - ]
Result:
OK
See step 3
- Remove the radio receiver assembly.
- CHECK HARNESS AND CONNECTOR (AVC-LAN CIRCUIT)
- Disconnect the G147 radio receiver assembly connector.
- Disconnect the G9 stereo component amplifier assembly connector.
- Disconnect the G22 multi-display assembly connector.
- Disconnect the G23 air conditioning control assembly connector.
- Disconnect the X1 cooler control switch assembly. (w/ Cooler Control Switch Assembly)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition G147-7 (TX2+) - G9-8 (TX+) Always Below 1 Ω G147-8 (TX2-) - G9-7 (TX-) Always Below 1 Ω G147-1 (TX1+) - G22-7 (TX+) Always Below 1 Ω G147-2 (TX1-) - G22-19 (TX-) Always Below 1 Ω G22-6 (TX1+) - G23-1 (TX1+) Always Below 1 Ω G22-18 (TX1-) - G23-2 (TX1-) Always Below 1 Ω G23-9 (TX+) - X1-7 (TX+)* Always Below 1 Ω G23-10 (TX-) - X1-8 (TX-)* Always Below 1 Ω G147-7 (TX2+) or G9-8 (TX+) - Body ground Always 10 kΩ or higher G147-8 (TX2-) or G9-7 (TX-) - Body ground Always 10 kΩ or higher G147-1 (TX1+) or G22-7 (TX+) - Body ground Always 10 kΩ or higher G147-2 (TX1-) or G22-19(TX-) - Body ground Always 10 kΩ or higher 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 G23-9 (TX+) or X1-7 (TX+) - Body ground* Always 10 kΩ or higher G23-10 (TX-) or X1-8 (TX-) - Body ground* Always 10 kΩ or higher - *: w/ Cooler Control Switch Assembly
Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 4
- INSPECT MALFUNCTIONING PARTS
- 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.
Result
Proceed to OK NG
Result:
OK
REPLACE MALFUNCTIONING PARTS
Result:
NG
REPLACE RADIO RECEIVER ASSEMBLY. Refer to REMOVAL [09/2022 - ]
- Disconnect and reconnect each slave unit one by one until the master unit returns to normal.