Toyota Camry owners & service manuals

Toyota Camry (XV70): Voice Recognition Microphone Disconnected (B1579)

Toyota Camry Repair Manual XV70 (2018-2024) / Audio, Visual, Telematics / Navigation / Multi Info Display / Navigation System / Voice Recognition Microphone Disconnected (B1579)

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 Navigation System.

    Click here

  • 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

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 and w/o Manual (SOS) Switch)

C

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

D

NG

E

*a

Component with harness connected

(Radio and Display Receiver Assembly)
B

GO TO STEP 3

C

GO TO STEP 9

D

GO TO STEP 10

E

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 K140 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

K140-7 (MCI-) - V14-7 (MCO-)

Always

Below 1 Ω

K140-7 (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 K140 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-) - K140-32 (MCO-)

Always

Below 1 Ω

K2-22 (MIN-) or K140-32 (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 K140 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

K140-7 (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

(b) Connect the B 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

(b) Disconnect the B telephone microphone assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B-1 - V14-6 (SNS2)

Always

Below 1 Ω

B-2 - V14-7 (MCO-)

Always

Below 1 Ω

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

Always

10 kΩ or higher

B-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 V18 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) - V18-3 (SNS2)

Always

Below 1 Ω

K2-22 (MIN-) - V18-4 (MCO-)

Always

Below 1 Ω

K2-25 (SNS2) or V18-3 (SNS2) - Body ground

Always

10 kΩ or higher

K2-22 (MIN-) or V18-4 (MCO-) - Body ground

Always

10 kΩ or higher
OK

GO TO STEP 14

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.

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

(a) Disconnect the K140 DCM (telematics transceiver) connector.

(b) Disconnect the V18 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

K140-7 (MCI-) - V18-4 (MCO-)

Always

Below 1 Ω

K140-7 (MCI-) or V18-4 (MCO-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

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 K140 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-) - K140-32 (MCO-)

Always

Below 1 Ω

K2-22 (MIN-) or K140-32 (MCO-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

12.

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 V18 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) - V18-3 (SNS2)

Always

Below 1 Ω

K2-25 (SNS2) or V18-3 (SNS2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

13.

INSPECT DCM (TELEMATICS TRANSCEIVER)

(a) Connect the K140 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

K140-7 (MCI-) - Body ground

Always

Below 1 Ω

*a

Component with harness connected

(DCM (Telematics Transceiver))
NG

REPLACE DCM (TELEMATICS TRANSCEIVER)

OK

14.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here

(b) Connect the B telephone microphone assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 (SNS2) - 4 (MCO-)

Always

Below 1 Ω

*a

Component without harness connected

(Roof Console Box Sub-assembly)
OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

15.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here

(b) Disconnect the B telephone microphone assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B-1 - V18-3 (SNS2)

Always

Below 1 Ω

B-2 - V18-4 (MCO-)

Always

Below 1 Ω

B-1 or V18-3 (SNS2) - V18-11 (GND)

Always

10 kΩ or higher

B-2 or V18-4 (MCO-) - V18-11 (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

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