Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001PY57
Model Year Start: 2021 Model: Avalon HV Prod Date Range: [08/2020 -           ]
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: B157213; Microphone Circuit Open; 2021 - 2022 MY Avalon Avalon HV [08/2020 -        ]

DTC

B157213

Microphone Circuit Open

DESCRIPTION

This DTC is stored when the DCM (telematics transceiver) detects a malfunction in the telephone microphone assembly circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B157213

Microphone Circuit Open

Current at terminal MCVD is lower than the malfunction threshold for 10 seconds or more while the ignition switch is ON
  • DCM (telematics transceiver)
  • Roof console box sub-assembly
  • Telephone microphone assembly
  • Harness or connector

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 Safety Connect System.

Click here 2021 MY Avalon Avalon HV [08/2020 - 08/2021]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: PRECAUTION 2022 MY Avalon Avalon HV [08/2021 -        ]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM: PRECAUTION

PROCEDURE

1.

CHECK DTC

(a) Turn the ignition switch off.

(b) Connect the GTS to the DLC3.

(c) Turn the ignition switch to ON and wait for 10 seconds or more.

(d) Turn the GTS on.

(e) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(f) Check for DTCs and check that no DTCs are output.

Body Electrical > Telematics > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

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 6

A

3.

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

(a) Disconnect the G124 DCM (telematics transceiver) connector.

(b) Disconnect the O10 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

G124-5 (MCVD) - O10-9 (MACC)

Always

Below 1 Ω

G124-6 (MCI+) - O10-8 (MCO+)

Always

Below 1 Ω

G124-7 (MCI-) - O10-7 (MCO-)

Always

Below 1 Ω

G124-23 (SGND) - Body ground

Always

10 kΩ or higher

G124-5 (MCVD) or O10-9 (MACC) - Body ground

Always

10 kΩ or higher

G124-6 (MCI+) or O10-8 (MCO+) - Body ground

Always

10 kΩ or higher

G124-7 (MCI-) or O10-7 (MCO-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK DCM (TELEMATICS TRANSCEIVER) (ROOF CONSOLE BOX SUB-ASSEMBLY POWER SOURCE)

(a) Remove the telephone microphone assembly but do not disconnect the connectors.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; AUDIO / VIDEO: MICROPHONE: 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

Switch Condition

Specified Condition

O10-9 (MACC) - Body ground

Ignition switch ON

4 to 6 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

O10-7 (MCO-) - Body ground

Always

Below 1 Ω
NG

GO TO STEP 9

OK

5.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (INT): PERSONAL LIGHT: REMOVAL

*a

Component without harness connected

(roof console box sub-assembly (Wire Harness Side))

*b

Component without harness connected

(roof console box sub-assembly (Telephone Microphone Assembly Side))

(b) Remove the telephone microphone assembly.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; AUDIO / VIDEO: MICROPHONE: REMOVAL

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

9 (MACC) - A-5 (MACC)

Always

Below 1 Ω

8 (MCO+) - A-3 (MIC+)

Always

Below 1 Ω

7 (MCO-) - A-2 (MIC-)

Always

Below 1 Ω

9 (MACC) - 8 (MCO+)

Always

10 kΩ or higher

9 (MACC) - 7 (MCO-)

Always

10 kΩ or higher

8 (MCO+) - 7 (MCO-)

Always

10 kΩ or higher
OK

REPLACE TELEPHONE MICROPHONE ASSEMBLY

NG

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

6.

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

(a) Disconnect the G124 DCM (telematics transceiver) connector.

(b) Disconnect the O9 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

G124-5 (MCVD) - O9-6 (MACC)

Always

Below 1 Ω

G124-6 (MCI+) - O9-5 (MCO+)

Always

Below 1 Ω

G124-7 (MCI-) - O9-4 (MCO-)

Always

Below 1 Ω

G124-23 (SGND) - Body ground

Always

10 kΩ or higher

G124-5 (MCVD) or O9-6 (MACC) - Body ground

Always

10 kΩ or higher

G124-6 (MCI+) or O9-5 (MCO+) - Body ground

Always

10 kΩ or higher

G124-7 (MCI-) or O9-4 (MCO-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

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

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

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; 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

Switch Condition

Specified Condition

O9-6 (MACC) - Body ground

Ignition switch ON

4 to 6 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

O9-4 (MCO-) - Body ground

Always

Below 1 Ω
NG

GO TO STEP 9

OK

8.

INSPECT ROOF CONSOLE BOX SUB-ASSEMBLY

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

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; LIGHTING (INT): PERSONAL LIGHT: REMOVAL

*a

Component without harness connected

(roof console box sub-assembly (Wire Harness Side))

*b

Component without harness connected

(roof console box sub-assembly (Telephone Microphone Assembly Side))

(b) Remove the telephone microphone assembly.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; AUDIO / VIDEO: MICROPHONE: REMOVAL

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

6 (MACC) - A-5 (MACC)

Always

Below 1 Ω

5 (MCO+) - A-3 (MIC+)

Always

Below 1 Ω

4 (MCO-) - A-2 (MIC-)

Always

Below 1 Ω

6 (MACC) - 5 (MCO+)

Always

10 kΩ or higher

6 (MACC) - 4 (MCO-)

Always

10 kΩ or higher

5 (MCO+) - 4 (MCO-)

Always

10 kΩ or higher
OK

REPLACE TELEPHONE MICROPHONE ASSEMBLY

NG

REPLACE ROOF CONSOLE BOX SUB-ASSEMBLY

9.

REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (telematics transceiver) with a new one.

Click here 2021 - 2022 MY Avalon Avalon HV [08/2020 -        ]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

NOTICE:

  • The ignition switch must be off.
  • Do not exchange the DCM (telematics transceiver) with one from another vehicle.
NEXT

PERFORM DCM ACTIVATION