Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Voice Recognition Microphone Disconnected (B1579)
DESCRIPTION
The radio receiver assembly and telephone microphone assembly are connected to each other using the microphone connection detection signal lines.
This DTC is stored when a microphone connection detection signal line is disconnected.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1579 | Voice Recognition Microphone Disconnected | Microphone signal is lost. |
|
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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PROCEDURE
| 1. | INSPECT RADIO RECEIVER ASSEMBLY |
| (a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| NG |  | REPLACE RADIO RECEIVER ASSEMBLY |
|
| 2. | CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY) |
(a) Disconnect the J151 radio receiver assembly connector.
(b) Disconnect the U15 telephone microphone assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| J151-25 (SNS2) - U15-3 (SNS2) | Always | Below 1 Ω |
| J151-22 (MIN-) - U15-4 (MCO-) | Always | Below 1 Ω |
| J151-25 (SNS2) or U15-3 (SNS2) - Body ground | Always | 10 kΩ or higher |
| J151-22 (MIN-) or U15-4 (MCO-) - Body ground | Always | 10 kΩ or higher |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. | INSPECT TELEPHONE MICROPHONE ASSEMBLY |
(a) Remove the telephone microphone assembly.
Click here
| (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| OK | | REPLACE RADIO RECEIVER ASSEMBLY |
| NG | | REPLACE TELEPHONE MICROPHONE ASSEMBLY |
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DESCRIPTION The radio receiver assembly and multi-display assembly are connected via video signal (digital) lines. This DTC is stored when a video signal (digital) line is disconnected. DTC No. D ...
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Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual
- For your information
- Pictorial index
- For safety and security
- Instrument cluster
- Operation of each component
- Driving
- Lexus Display Audio system
- Interior features
- Maintenance and care
- When trouble arises
- Vehicle specifications
- For owners
Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual
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