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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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:
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NG | ![]() | REPLACE RADIO RECEIVER ASSEMBLY |
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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 |
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3. | INSPECT MALFUNCTIONING PARTS |
(a) Disconnect and reconnect each slave unit one by one until the master unit returns to normal.
HINT:
OK:
Master unit return to normal.
OK | ![]() | REPLACE MALFUNCTIONING PARTS |
NG | ![]() | REPLACE RADIO RECEIVER ASSEMBLY |
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Lexus RX (RX 350L, RX450h) 2016-2023 Repair Manual > Audio And Visual System (for 12.3 Inch Display): Microphone Circuit
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