DTC B1579-13: Voice Recognition Microphone1 Circuit Open [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.
- CHECK HARNESS AND CONNECTOR (TELEPHONE MICROPHONE ASSEMBLY LH - RADIO RECEIVER ASSEMBLY, DCM (TELEMATICS TRANSCEIVER))
- Disconnect the P24 telephone microphone assembly LH connector.
- Disconnect the G147 radio receiver assembly connector.
- Disconnect the G128 telematics transceiver connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition P24-5 (SNS1) - G147-25 (SNS) Always Below 1 Ω P24-4 (MO1-) - G128-7 (MCI-) Always Below 1 Ω P24-5 (SNS1) or G147-25 (SNS) - Body ground Always 10 kΩ or higher P24-4 (MO1-) or G128-7 (MCI-) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 2
- INSPECT DCM (TELEMATICS TRANSCEIVER (MCI-)) (MCI-)
- With the telematics transceiver connectors connected, disconnect the P24 telephone microphone assembly LH connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition P24-4 (MO1-) - Body ground Always Below 1 Ω Result
Proceed to OK NG
Result:
NG
REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to REMOVAL [09/2022 - ]
Result:
OK
See step 3
- INSPECT TELEPHONE MICROPHONE ASSEMBLY LH (SNS2, MO1-)
- Remove the telephone microphone assembly LH.
*a Component without harness connected
(Telephone microphone assembly LH) - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition 5 (SNS1) - 4 (MO1-) Always Below 1 Ω Result
Proceed to OK NG
Result:
OK
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY. Refer to REMOVAL [09/2022 - ]
Result:
NG
REPLACE TELEPHONE MICROPHONE ASSEMBLY LH. Refer to REMOVAL [09/2022 - ]
- Remove the telephone microphone assembly LH.