Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM1000000012SE7
Model Year Start: 2018 Model: Camry Prod Date Range: [03/2017 - 06/2017]
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: B1579; Voice Recognition Microphone Disconnected; 2018 MY Camry [03/2017 - 06/2017]

DTC

B1579

Voice Recognition Microphone Disconnected

DESCRIPTION

The radio and display receiver assembly, roof console box sub-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
  • Roof console box sub-assembly
  • Telephone microphone assembly
  • Radio and display receiver assembly
  • DCM (telematics transceiver)*
  • Harness or connector
  • *: w/ Manual (SOS) Switch

WIRING DIAGRAM

w/ Sliding Roof
w/o Sliding Roof

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.

    Click here 2018 MY Camry [03/2017 - 06/2017]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: PRECAUTION

  • When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occur:
    • A communication malfunction DTC may be stored.
    • The radio and display receiver assembly may not operate normally.
  • Before replacing the DCM (telematics transceiver), refer to Registration.

    Click here 2018 - 2019 MY Camry [03/2017 - 09/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function): REGISTRATION

PROCEDURE

1.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

K2-22 (MIN-) - Body ground

Always

Below 1 Ω

Result:

Result

Proceed to

OK (w/ Sliding Roof and w/o Manual (SOS) Switch)

A

OK (w/ Sliding Roof and w/ Manual (SOS) Switch)

B

OK (w/o Sliding Roof)

C

NG

D

*a

Component with harness connected

(Radio and Display Receiver Assembly)
B

GO TO STEP 3

C

GO TO STEP 9

D

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

A

2.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Disconnect the K2 radio and display receiver assembly connector.

(b) Disconnect the V14 roof console box sub-assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

K2-25 (SNS2) - V14-6 (SNS2)

Always

Below 1 Ω

K2-22 (MIN-) - V14-7 (MCO-)

Always

Below 1 Ω

K2-25 (SNS2) or V14-6 (SNS2) - Body ground

Always

10 kΩ or higher

K2-22 (MIN-) or V14-7 (MCO-) - Body ground

Always

10 kΩ or higher
OK

GO TO STEP 7

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Disconnect the K12 DCM (telematics transceiver) connector.

(b) Disconnect the V14 roof console box sub-assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

K12-35 (MCI-) - V14-7 (MCO-)

Always

Below 1 Ω

K12-35 (MCI-) or V14-7 (MCO-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER))

(a) Disconnect the K2 radio and display receiver assembly connector.

(b) Disconnect the K12 DCM (telematics transceiver) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

K2-22 (MIN-) - K12-19 (MCO-)

Always

Below 1 Ω

K2-22 (MIN-) or K12-19 (MCO-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Disconnect the K2 radio and display receiver assembly connector.

(b) Disconnect the V14 roof console box sub-assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

K2-25 (SNS2) - V14-6 (SNS2)

Always

Below 1 Ω

K2-25 (SNS2) or V14-6 (SNS2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

INSPECT DCM (TELEMATICS TRANSCEIVER)

(a) Connect the K12 DCM (telematics transceiver) connector.

(b) Connect the K2 radio and display receiver assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

K12-35 (MCI-) - Body ground

Always

Below 1 Ω

*a

Component with harness connected

(DCM (Telematics Transceiver))
NG

REPLACE DCM (TELEMATICS TRANSCEIVER)

OK

7.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

(a) Remove the roof console box sub-assembly.

Click here 2018 MY Camry [03/2017 - 06/2017]; LIGHTING (INT): PERSONAL LIGHT: REMOVAL

(b) Connect the MI2 telephone microphone assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

6 (SNS2) - 7 (MCO-)

Always

Below 1 Ω

*a

Component without harness connected

(Roof Console Box Sub-assembly)
OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

8.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

(a) Remove the roof console box sub-assembly.

Click here 2018 MY Camry [03/2017 - 06/2017]; LIGHTING (INT): PERSONAL LIGHT: REMOVAL

(b) Disconnect the MI2 telephone microphone assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

MI2-1 - V14-6 (SNS2)

Always

Below 1 Ω

MI2-2 - V14-7 (MCO-)

Always

Below 1 Ω

MI2-1 or V14-6 (SNS2) - V14-15 (GND)

Always

10 kΩ or higher

MI2-2 or V14-7 (MCO-) - V14-15 (GND)

Always

10 kΩ or higher

*a

Component without harness connected

(Roof Console Box Sub-assembly (No. 1 Roof Wire Side))

*b

Component without harness connected

(Roof Console Box Sub-assembly (Telephone Microphone Assembly Side))
OK

REPLACE TELEPHONE MICROPHONE ASSEMBLY

NG

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

9.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - ROOF CONSOLE BOX SUB-ASSEMBLY)

(a) Disconnect the K2 radio and display receiver assembly connector.

(b) Disconnect the V12 roof console box sub-assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

K2-25 (SNS2) - V12-12 (SNS2)

Always

Below 1 Ω

K2-22 (MIN-) - V12-11 (MCO-)

Always

Below 1 Ω

K2-25 (SNS2) or V12-12 (SNS2) - Body ground

Always

10 kΩ or higher

K2-22 (MIN-) or V12-11 (MCO-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

10.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

(a) Remove the roof console box sub-assembly.

Click here 2018 MY Camry [03/2017 - 06/2017]; LIGHTING (INT): PERSONAL LIGHT: REMOVAL

(b) Connect the MI2 telephone microphone assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

12 (SNS2) - 11 (MCO-)

Always

Below 1 Ω

*a

Component without harness connected

(Roof Console Box Sub-assembly)
OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

11.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

(a) Remove the roof console box sub-assembly.

Click here 2018 MY Camry [03/2017 - 06/2017]; LIGHTING (INT): PERSONAL LIGHT: REMOVAL

(b) Disconnect the MI2 telephone microphone assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

MI2-1 - V12-12 (SNS2)

Always

Below 1 Ω

MI2-2 - V12-11 (MCO-)

Always

Below 1 Ω

MI2-1 or V12-12 (SNS2) - V12-4 (GND)

Always

10 kΩ or higher

MI2-2 or V12-11 (MCO-) - V12-4 (GND)

Always

10 kΩ or higher

*a

Component without harness connected

(Roof Console Box Sub-assembly (No. 1 Roof Wire Side))

*b

Component without harness connected

(Roof Console Box Sub-assembly (Telephone Microphone Assembly Side))
OK

REPLACE TELEPHONE MICROPHONE ASSEMBLY

NG

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY