AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Microphone Circuit between Microphone and Radio Receiver; 2020 - 2024 MY Camry HV [09/2019

Last Modified: 11-20-2023	6.11:8.1.0	Doc ID: RM100000001KN38
Model Year Start: 2020	Model: Camry HV	Prod Date Range: [09/2019 - ]
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Microphone Circuit between Microphone and Radio Receiver; 2020 - 2024 MY Camry HV [09/2019 - ]

Microphone Circuit between Microphone and Radio Receiver

DESCRIPTION

w/o Manual (SOS) Switch:
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.

Using this circuit, the radio and display receiver assembly sends power to the roof console box sub-assembly and telephone microphone assembly, and the roof console box sub-assembly and telephone microphone assembly sends microphone signals to the radio and display receiver assembly.
w/ Manual (SOS) Switch:
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.

Using this circuit, the DCM (telematics transceiver) sends power to the roof console box sub-assembly and telephone microphone assembly, and the roof console box sub-assembly and telephone microphone assembly sends microphone signals to the radio and display receiver assembly via the DCM (telematics transceiver).

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 19

2.	CHECK MICROPHONE (OPERATION CHECK)

(a) Enter the "Microphone Check" screen. Refer to Check Microphone in Operation Check.

Click here

(b) When a voice is input into the microphone, check that the microphone input level meter changes according to the input voice.

OK:

Check result is normal.

Result	Proceed to
NG (w/o Manual (SOS) Switch)	A
NG (w/ Manual (SOS) Switch)	B
OK	C

GO TO STEP 9

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
K2-23 (MACC) - V14-9 (MACC)	Always	Below 1 Ω
K2-21 (MIN+) - V14-8 (MCO+)	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
K2-23 (MACC) or V14-9 (MACC) - Body ground	Always	10 kΩ or higher
K2-21 (MIN+) or V14-8 (MCO+) - Body ground	Always	10 kΩ or higher
K2-22 (MIN-) or V14-7 (MCO-) - Body ground	Always	10 kΩ or higher
K2-24 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
K2-23 (MACC) - Body ground	Power switch on (ACC)	4 to 6 V

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K2-24 (SGND) - Body ground	Always	Below 1 Ω
K2-22 (MIN-) - Body ground	Always	Below 1 Ω

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

5.	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)

GO TO STEP 8

6.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

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

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

(d) Connect an oscilloscope to terminals 8 (MCO+) and 7 (MCO-) of the V14 roof console box sub-assembly connector.

*a	Component with harness connected (Roof Console Box Sub-assembly)

(e) Check the signal waveform according to the condition(s) in the table below.

Item	Condition
Measurement terminal	V14-8 (MCO+) - V14-7 (MCO-)
Tool setting	50 mV/DIV., 500 ms/DIV.
Vehicle condition	Turn the power switch on (ACC). Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-assembly sound holes.

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

7.	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
V14-8 (MCO+) - B-3	Always	Below 1 Ω
V14-7 (MCO-) - B-2	Always	Below 1 Ω
V14-8 (MCO+) or B-3 - V14-15 (GND)	Always	10 kΩ or higher
V14-7 (MCO-) or B-2 - 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

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.

Standard Resistance:

Tester Connection	Condition	Specified Condition
V14-6 (SNS2) - B-1	Always	Below 1 Ω
V14-7 (MCO-) - B-2	Always	Below 1 Ω
V14-6 (SNS2) or B-1 - V14-15 (GND)	Always	10 kΩ or higher
V14-7 (MCO-) or B-2 - 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

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 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

10.	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
K2-21 (MIN+) - K140-16 (MCO+)	Always	Below 1 Ω
K2-22 (MIN-) - K140-32 (MCO-)	Always	Below 1 Ω
K2-21 (MIN+) or K140-16 (MCO+) - Body ground	Always	10 kΩ or higher
K2-22 (MIN-) or K140-32 (MCO-) - Body ground	Always	10 kΩ or higher
K2-24 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.	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
K140-6 (MCVD) - V14-9 (MACC)	Always	Below 1 Ω
K140-5 (MCI+) - V14-8 (MCO+)	Always	Below 1 Ω
K140-7 (MCI-) - V14-7 (MCO-)	Always	Below 1 Ω
K140-6 (MCVD) or V14-9 (MACC) - Body ground	Always	10 kΩ or higher
K140-5 (MCI+) or V14-8 (MCO+) - Body ground	Always	10 kΩ or higher
K140-7 (MCI-) or V14-7 (MCO-) - Body ground	Always	10 kΩ or higher
K140-23 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.	INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

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

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K2-24 (SGND) - Body ground	Always	Below 1 Ω
K2-22 (MIN-) - Body ground	Always	Below 1 Ω

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

13.	INSPECT DCM (TELEMATICS TRANSCEIVER)

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

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
K140-33 (MCVD) - Body ground	Power switch on (ACC)	4 to 6 V

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K140-35 (MCI-) - Body ground	Always	Below 1 Ω
K140-32 (SGND) - Body ground	Always	Below 1 Ω

REPLACE DCM (TELEMATICS TRANSCEIVER)

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.

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)

GO TO STEP 18

15.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY (OUTPUT TO DCM (TELEMATICS TRANSCEIVER))

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

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

(d) Turn the power switch on (ACC).

(e) Connect an oscilloscope to terminals 8 (MCO+) and 7 (MCO-) of the V14 roof console box sub-assembly connector.

*a	Component with harness connected (Roof Console Box Sub-assembly)

(f) Check the signal waveform according to the condition(s) in the table below.

Item	Condition
Measurement terminal	V14-8 (MCO+) - V14-7 (MCO-)
Tool setting	50 mV/DIV., 500 ms/DIV.
Vehicle condition	Turn the power switch on (ACC). Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-assembly sound holes.

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only.

GO TO STEP 17

16.	INSPECT DCM (TELEMATICS TRANSCEIVER) (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

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

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

(d) Turn the power switch on (ACC).

(e) Connect an oscilloscope to terminals 16 (MCO+) and 32 (MCO-) of the K140 DCM (telematics transceiver) connector.

*a	Component with harness connected DCM (Telematics Transceiver)

(f) Check the signal waveform according to the condition(s) in the table below.

Item	Condition
Measurement terminal	K140-16 (MCO+) - K140-32 (MCO-)
Tool setting	50 mV/DIV., 500 ms/DIV.
Vehicle condition	Turn the power switch on (ACC). Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-assembly sound holes.

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE DCM (TELEMATICS TRANSCEIVER)

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
V14-8 (MCO+) - B-3	Always	Below 1 Ω
V14-7 (MCO-) - B-2	Always	Below 1 Ω
V14-8 (MCO+) or B-3 - V14-15 (GND)	Always	10 kΩ or higher
V14-7 (MCO-) or B-2 - 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

18.	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
V14-6 (SNS2) - B-1	Always	Below 1 Ω
V14-7 (MCO-) - B-2	Always	Below 1 Ω
V14-6 (SNS2) or B-1 - V14-15 (GND)	Always	10 kΩ or higher
V14-7 (MCO-) or B-2 - 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

19.	CHECK MICROPHONE (OPERATION CHECK)

(a) Enter the "Microphone Check" screen. Refer to Check Microphone in Operation Check.

Click here

(b) When a voice is input into the microphone, check that the microphone input level meter changes according to the input voice.

OK:

Check result is normal.

Result	Proceed to
NG (w/o Manual (SOS) Switch)	A
NG (w/ Manual (SOS) Switch)	B
OK	C

GO TO STEP 26

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

20.	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
K2-23 (MACC) - V18-6 (MACC)	Always	Below 1 Ω
K2-21 (MIN+) - V18-5 (MCO+)	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
K2-23 (MACC) or V18-6 (MACC) - Body ground	Always	10 kΩ or higher
K2-21 (MIN+) or V18-5 (MCO+) - Body ground	Always	10 kΩ or higher
K2-22 (MIN-) or V18-4 (MCO-) - Body ground	Always	10 kΩ or higher
K2-24 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

21.	INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

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

(b) Connect the V18 roof console box sub-assembly connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
K2-23 (MACC) - Body ground	Power switch on (ACC)	4 to 6 V

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K2-24 (SGND) - Body ground	Always	Below 1 Ω
K2-22 (MIN-) - Body ground	Always	Below 1 Ω

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

22.	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)

GO TO STEP 25

23.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

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

(b) Connect the V18 roof console box sub-assembly connector.

(d) Connect an oscilloscope to terminals 5 (MCO+) and 4 (MCO-) of the V18 roof console box sub-assembly connector.

*a	Component with harness connected (Roof Console Box Sub-assembly)

(e) Check the signal waveform according to the condition(s) in the table below.

Item	Condition
Measurement terminal	V18-5 (MCO+) - V18-4 (MCO-)
Tool setting	50 mV/DIV., 500 ms/DIV.
Vehicle condition	Turn the power switch on (ACC). Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-assembly sound holes.

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

24.	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
V18-5 (MCO+) - B-3	Always	Below 1 Ω
V18-4 (MCO-) - B-2	Always	Below 1 Ω
V18-5 (MCO+) or B-3 - V18-11 (GND)	Always	10 kΩ or higher
V18-4 (MCO-) or B-2 - 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

25.	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
V18-3 (SNS2) - B-1	Always	Below 1 Ω
V18-4 (MCO-) - B-2	Always	Below 1 Ω
V18-3 (SNS2) or B-1 - V18-11 (GND)	Always	10 kΩ or higher
V18-4 (MCO-) or B-2 - 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

26.	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

27.	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
K2-21 (MIN+) - K140-16 (MCO+)	Always	Below 1 Ω
K2-22 (MIN-) - K140-32 (MCO-)	Always	Below 1 Ω
K2-21 (MIN+) or K140-16 (MCO+) - Body ground	Always	10 kΩ or higher
K2-22 (MIN-) or K140-32 (MCO-) - Body ground	Always	10 kΩ or higher
K2-24 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

28.	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
K140-5 (MCVD) - V18-6 (MACC)	Always	Below 1 Ω
K140-6 (MCI+) - V18-5 (MCO+)	Always	Below 1 Ω
K140-7 (MCI-) - V18-4 (MCO-)	Always	Below 1 Ω
K140-5 (MCVD) or V18-6 (MACC) - Body ground	Always	10 kΩ or higher
K140-6 (MCI+) or V18-5 (MCO+) - Body ground	Always	10 kΩ or higher
K140-7 (MCI-) or V18-4 (MCO-) - Body ground	Always	10 kΩ or higher
K140-23 (SGND) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

29.	INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

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

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K2-24 (SGND) - Body ground	Always	Below 1 Ω
K2-22 (MIN-) - Body ground	Always	Below 1 Ω

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

30.	INSPECT DCM (TELEMATICS TRANSCEIVER)

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

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
K140-5 (MCVD) - Body ground	Power switch on (ACC)	4 to 6 V

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
K140-6 (MCI-) - Body ground	Always	Below 1 Ω
K140-23 (SGND) - Body ground	Always	Below 1 Ω

REPLACE DCM (TELEMATICS TRANSCEIVER)

31.	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)

GO TO STEP 35

32.	INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

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

(b) Connect the V18 roof console box sub-assembly connector.

(d) Connect an oscilloscope to terminals 5 (MCO+) and 4 (MCO-) of the V18 roof console box sub-assembly connector.

*a	Component with harness connected (Roof Console Box Sub-assembly)

(e) Check the signal waveform according to the condition(s) in the table below.

Item	Condition
Measurement terminal	V18-5 (MCO+) - V18-4 (MCO-)
Tool setting	50 mV/DIV., 500 ms/DIV.
Vehicle condition	Turn the power switch on (ACC). Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-assembly sound holes.

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only.

GO TO STEP 34

33.	INSPECT DCM (TELEMATICS TRANSCEIVER) (OUTPUT TO RADIO AND DISPLAY RECEIVER ASSEMBLY)

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

(b) Connect the V18 roof console box sub-assembly connector.

(d) Turn the power switch on (ACC).

(e) Connect an oscilloscope to terminals 16 (MCO+) and 32 (MCO-) of the K140 DCM (telematics transceiver) connector.

*a	Component with harness connected DCM (Telematics Transceiver)

(f) Check the signal waveform according to the condition(s) in the table below.

Item	Condition
Measurement terminal	K140-16 (MCO+) - K140-32 (MCO-)
Tool setting	50 mV/DIV., 500 ms/DIV.
Vehicle condition	Turn the power switch on (ACC). Sound is input to the roof console box sub-assembly when the user is closer than 125 mm from the roof console box sub-assembly sound holes.

OK:

The waveform is similar to that shown in the illustration.

HINT:

The oscilloscope waveform shown in the illustration is an example for reference only.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE DCM (TELEMATICS TRANSCEIVER)

34.	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
V18-5 (MCO+) - B-3	Always	Below 1 Ω
V18-4 (MCO-) - B-2	Always	Below 1 Ω
V18-5 (MCO+) or B-3 - V18-11 (GND)	Always	10 kΩ or higher
V18-4 (MCO-) or B-2 - 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

35.	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
V18-3 (SNS2) - B-1	Always	Below 1 Ω
V18-4 (MCO-) - B-2	Always	Below 1 Ω
V18-3 (SNS2) or B-1 - V18-11 (GND)	Always	10 kΩ or higher
V18-4 (MCO-) or B-2 - 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