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:
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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:
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| NG | .gif) | REPLACE RADIO RECEIVER ASSEMBLY |
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| 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 |
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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:
- 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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