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

Toyota Camry Repair Manual XV70 (2018-2024) / Audio, Visual, Telematics / Audio / Video / Audio And Visual 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 Audio and Visual 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.	CHECK MODEL

(a) Choose the model to be inspected.

Result	Proceed to
w/ Sliding Roof	A
w/o Sliding Roof	B

GO TO STEP 10

2.	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/o Manual (SOS) Switch)	A
OK (w/ Manual (SOS) Switch)	B
NG	C

*a	Component with harness connected (Radio and Display Receiver Assembly)

GO TO STEP 4

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

3.	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.

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

GO TO STEP 8

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	INSPECT DCM (TELEMATICS TRANSCEIVER)

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K140-7 (MCI-) - Body ground	Always	Below 1 Ω

*a	Component with harness connected (DCM (Telematics Transceiver))

REPLACE DCM (TELEMATICS TRANSCEIVER)

8.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here

(b) Connect the B telephone microphone assembly connector.

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)

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

9.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here

(b) Disconnect the B telephone microphone assembly connector.

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

Component without harness connected

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

Component without harness connected

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

REPLACE TELEPHONE MICROPHONE ASSEMBLY

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

10.	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/o Manual (SOS) Switch)	A
OK (w/ Manual (SOS) Switch)	B
NG	C

*a	Component with harness connected (Radio and Display Receiver Assembly)

GO TO STEP 12

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

11.	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.

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

GO TO STEP 16

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.	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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

13.	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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.	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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

15.	INSPECT DCM (TELEMATICS TRANSCEIVER)

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K140-7 (MCI-) - Body ground	Always	Below 1 Ω

*a	Component with harness connected (DCM (Telematics Transceiver))

REPLACE DCM (TELEMATICS TRANSCEIVER)

16.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here

(b) Connect the B telephone microphone assembly connector.

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)

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

17.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here

(b) Disconnect the B telephone microphone assembly connector.

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

Component without harness connected

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

Component without harness connected

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

REPLACE TELEPHONE MICROPHONE ASSEMBLY

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

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