Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC B1579: Voice Recognition Microphone Disconnected [11/2018 - 10/2019]: Procedure
- CHECK VEHICLE TYPE
Result:
B
See step 5
Result:
A
See step 2
- CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)
- Disconnect the G2 radio and display receiver assembly connector.
- Disconnect the P14 map light assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
FOR TMC MADE:Tester Connection Condition Specified Condition G2-25 (SNS2) - P14-5 (SNS2) Always Below 1 Ω G2-25 (SNS2) - Body ground Always 10 kΩ or higher FOR TMMC MADE:Tester Connection Condition Specified Condition G2-25 (SNS2) - P14-6 (SNS2) Always Below 1 Ω G2-25 (SNS2) - 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
- CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - TELEPHONE MICROPHONE ASSEMBLY)
- Disconnect the G9 DCM (telematics transceiver) connector.
- Disconnect the P14 telephone microphone assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
FOR TMC MADE:Tester Connection Condition Specified Condition G9-35 (MCI-) - P14-5 (MCO-) Always Below 1 Ω G9-35 (MCI-) - Body ground Always 10 kΩ or higher FOR TMMC MADE:Tester Connection Condition Specified Condition G9-35 (MCI-) - P14-6 (MCO-) Always Below 1 Ω G9-35 (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 4
- CHECK DCM (TELEMATICS TRANSCEIVER) (MCI-)
- Remove the DCM (telematics transceiver) with the connector(s) still connected.
*a Component with harness connected
(DCM [Telematics Transceiver])Refer to REMOVAL [11/2018 - 10/2019]
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition G9-35 (MCI-) - 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 [11/2018 - 10/2019]
- Remove the DCM (telematics transceiver) with the connector(s) still connected.
- CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - TELEPHONE MICROPHONE ASSEMBLY)
- Disconnect the G2 radio and display receiver assembly connector.
- Disconnect the P14 map light assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
FOR TMC MADE:Tester Connection Condition Specified Condition G2-25 (SNS2) - P14-4 (SNS2) Always Below 1 Ω G2-22 (MIN-) - P14-5 (MCO-) Always Below 1 Ω G2-25 (SNS2) - Body ground Always 10 kΩ or higher G2-22 (MIN-) - Body ground Always 10 kΩ or higher FOR TMMC MADE:Tester Connection Condition Specified Condition G2-25 (SNS2) - P14-5 (SNS2) Always Below 1 Ω G2-22 (MIN-) - P14-6 (MCO-) Always Below 1 Ω G2-25 (SNS2) - Body ground Always 10 kΩ or higher G2-22 (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 6
- INSPECT MAP LIGHT ASSEMBLY
- Remove the map light assembly.
Refer to REMOVAL [11/2018 - ]
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
FOR TMC MADE:Tester Connection Condition Specified Condition 4 (SNS2) - 5 (MCO-) Always Below 1 Ω FOR TMMC MADE:Tester Connection Condition Specified Condition 5 (SNS2) - 6 (MCO-) Always Below 1 Ω *A for TMC Made *B for TMMC Made *a Component without harness connected
(Map Light Assembly)Result
Proceed to OK NG
Result:
OK
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY
Refer to REMOVAL [11/2018 - 10/2022]
Result:
NG
See step 7
- Remove the map light assembly.
- INSPECT MAP LIGHT ASSEMBLY
- Remove the map light assembly.
*A for TMC Made *B for TMMC Made *a Component without harness connected
(Map Light Assembly [Wire Harness Side])*b Component without harness connected
(Map Light Assembly [Telephone Microphone Assembly Side])Refer to REMOVAL [11/2018 - ]
- Disconnect the telephone microphone assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
FOR TMC MADE:Tester Connection Condition Specified Condition P14-4 (SNS2) - C-1 (SNS2) Always Below 1 Ω P14-5 (MCO-) - C-2 (MIC-) Always Below 1 Ω FOR TMMC MADE:Tester Connection Condition Specified Condition P14-5 (SNS2) - C-1 (SNS2) Always Below 1 Ω P14-6 (MCO-) - C-2 (MIC-) Always Below 1 Ω Result
Proceed to OK NG
Result:
OK
REPLACE TELEPHONE MICROPHONE ASSEMBLY
Refer to REMOVAL [11/2018 - 12/2021]
Result:
NG
REPLACE MAP LIGHT ASSEMBLY
Refer to REMOVAL [11/2018 - ]
- Remove the map light assembly.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.