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.
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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 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 |
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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 returns to normal.
OK | ![]() | REPLACE MALFUNCTIONING PARTS |
NG | ![]() | REPLACE RADIO RECEIVER ASSEMBLY |
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