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 MODEL
Result
Result Proceed to w/ DCM (telematics transceiver) A w/o DCM (telematics transceiver) B Result:
B
See step 4
Result:
A
See step 2
- CHECK HARNESS AND CONNECTOR (TELEPHONE MICROPHONE ASSEMBLY LH - RADIO RECEIVER ASSEMBLY, DCM (TELEMATICS TRANSCEIVER))
- Disconnect the P24 telephone microphone assembly LH connector.
- Disconnect the G146 radio receiver assembly connector.
- Disconnect the G128 DCM (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) - G146-25 (SNS) Always Below 1 Ω P24-4 (MO1-) - G128-7 (MCI-) Always Below 1 Ω P24-5 (SNS1) or G146-25 (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 3
- INSPECT DCM (TELEMATICS TRANSCEIVER) (MCI-)
- With the DCM (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:
OK
See step 6
Result:
NG
REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to REMOVAL [09/2022 - ]
- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY LH)
- Disconnect the G146 radio receiver assembly connector.
- 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 P24-5 (SNS1) - G146-25 (SNS) Always Below 1 Ω P24-4 (MO1-) - G146-22 (MIN-) Always Below 1 Ω P24-5 (SNS1) or G146-25 (SNS) - Body ground Always 10 kΩ or higher P24-4 (MO1-) or G146-22 (MIN-) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 5
- INSPECT RADIO RECEIVER ASSEMBLY (MIN-)
- With the radio receiver assembly 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 RADIO RECEIVER ASSEMBLY. Refer to REMOVAL [09/2022 - ]
Result:
OK
See step 6
- INSPECT TELEPHONE MICROPHONE ASSEMBLY LH (SNS1, 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 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.