Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM1000000015ZNV
Model Year Start: 2018 Model: Camry HV Prod Date Range: [07/2017 - 09/2019]
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: B1572; Telephone Microphone Error; 2018 - 2019 MY Camry HV [07/2017 - 09/2019]

DTC

B1572

Telephone Microphone Error

DESCRIPTION

This DTC is set when the DCM (Telematics Transceiver) detects a malfunction in the telephone microphone assembly circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1572

Telephone Microphone Error

Current of MCVD reaches malfunction criteria for 10 seconds while power switch is on (IG).
  • Wire harness or connector
  • Telephone microphone assembly
  • Roof console box sub-assembly
  • DCM (Telematics Transceiver)

WIRING DIAGRAM

w/o Sliding Roof
w/ Sliding Roof

CAUTION / NOTICE / HINT

HINT:

Before performing this diagnostic procedure, make sure to perform Health Check and confirm that the DCM/VIN registration information is correct.

Click here 2018 - 2019 MY Camry HV [07/2017 - 09/2019]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: HEALTH CHECK

PROCEDURE

1.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ Sliding Roof

A

w/o Sliding Roof

B
B

GO TO STEP 8

A

2.

CHECK DTC

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG) and wait for 10 seconds.

(d) Turn the Techstream on.

(e) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(f) Recheck for DTCs.

Body Electrical > Telematics > Trouble Codes

Result

Proceed to

DTC B1572 is output

A

DTC B1572 is not output

B
B

CHECK FOR INTERMITTENT PROBLEMS 2018 MY Camry HV [07/2017 - 09/2018]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2019 MY Camry HV [09/2018 - 09/2019]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

A

3.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY POWER SOURCE)

(a) Remove the roof console box sub-assembly but do not disconnect the connectors.

Click here 2018 - 2024 MY Camry HV [07/2017 -        ]; CELLULAR COMMUNICATION: MANUAL(SOS)SWITCH: REMOVAL

*a

Component with harness connected

(Roof Console Box Sub-assembly)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

V14-9 (MACC) - Body ground

Power switch on (ACC)

4 to 6 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

V14-7 (MCO-) - Body ground

Always

Below 1 Ω
NG

GO TO STEP 6

OK

4.

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

K12-34 (MCI+) - V14-8 (MCO+)

Always

Below 1 Ω

K12-34 (MCI+) or V14-8 (MCO+) - Body ground

Always

10 kΩ or higher

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

Always

Below 1 Ω

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

Always

10 kΩ or higher

K12-32 (SGND) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

REPLACE TELEPHONE MICROPHONE ASSEMBLY

(a) Replace the telephone microphone assembly with a normal one and check if the same problem occurs again.

Click here 2018 - 2024 MY Camry HV [07/2017 -        ]; AUDIO / VIDEO: MICROPHONE: REMOVAL

OK:

The system returns to normal.

OK

END
NG

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

6.

INSPECT DCM (TELEMATICS TRANSCEIVER) (TELEPHONE MICROPHONE ASSEMBLY POWER SOURCE)

(a) Remove the DCM (Telematics Transceiver) but do not disconnect the connectors.

Click here 2018 - 2019 MY Camry HV [07/2017 - 09/2019]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

*a

Component with harness connected

(DCM (Telematics Transceiver))

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

K12-33 (MCVD) - Body ground

Power switch on (ACC)

4 to 6 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

K12-35 (MCI-) - Body ground

Always

Below 1 Ω
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

7.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here 2018 - 2019 MY Camry HV [07/2017 - 09/2019]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

NOTICE:

  • The power switch must be off.
  • Do not swap the DCM (Telematics Transceiver) with one from another vehicle.
NEXT

PERFORM DCM ACTIVATION

8.

CHECK DTC

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG) and wait for 10 seconds.

(d) Turn the Techstream on.

(e) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(f) Recheck for DTCs.

Body Electrical > Telematics > Trouble Codes

Result

Proceed to

DTC B1572 is output

A

DTC B1572 is not output

B
B

CHECK FOR INTERMITTENT PROBLEMS 2018 MY Camry HV [07/2017 - 09/2018]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2019 MY Camry HV [09/2018 - 09/2019]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

A

9.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY POWER SOURCE)

(a) Remove the roof console box sub-assembly but do not disconnect the connectors.

Click here 2018 - 2024 MY Camry HV [07/2017 -        ]; CELLULAR COMMUNICATION: MANUAL(SOS)SWITCH: REMOVAL

*a

Component with harness connected

(Roof Console Box Sub-assembly)

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

V18-6 (MACC) - Body ground

Power switch on (ACC)

4 to 6 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

V18-4 (MCO-) - Body ground

Always

Below 1 Ω
NG

GO TO STEP 12

OK

10.

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

(a) Disconnect the K12 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

K12-34 (MCI+) - V18-5 (MCO+)

Always

Below 1 Ω

K12-34 (MCI+) or V18-5 (MCO+) - Body ground

Always

10 kΩ or higher

K12-35 (MCI-) - V18-4 (MCO-)

Always

Below 1 Ω

K12-35 (MCI-) or V18-4 (MCO-) - Body ground

Always

10 kΩ or higher

K12-32 (SGND) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

11.

REPLACE TELEPHONE MICROPHONE ASSEMBLY

(a) Replace the telephone microphone assembly with a normal one and check if the same problem occurs again.

Click here 2018 - 2024 MY Camry HV [07/2017 -        ]; AUDIO / VIDEO: MICROPHONE: REMOVAL

OK:

The system returns to normal.

OK

END
NG

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

12.

INSPECT DCM (TELEMATICS TRANSCEIVER) (TELEPHONE MICROPHONE ASSEMBLY POWER SOURCE)

(a) Remove the DCM (Telematics Transceiver) but do not disconnect the connectors.

Click here 2018 - 2019 MY Camry HV [07/2017 - 09/2019]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

*a

Component with harness connected

(DCM (Telematics Transceiver))

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

K12-33 (MCVD) - Body ground

Power switch on (ACC)

4 to 6 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

K12-35 (MCI-) - Body ground

Always

Below 1 Ω
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

13.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here 2018 - 2019 MY Camry HV [07/2017 - 09/2019]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

NOTICE:

  • The power switch must be off.
  • Do not swap the DCM (Telematics Transceiver) with one from another vehicle.
NEXT

PERFORM DCM ACTIVATION