Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001KGAA
Model Year Start: 2020 Model: RAV4 Prod Date Range: [10/2019 - 01/2020]
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: B1579; Voice Recognition Microphone Disconnected; 2020 MY RAV4 RAV4 HV [10/2019 - 01/2020]

DTC

B1579

Voice Recognition Microphone Disconnected

DESCRIPTION

The radio and display receiver assembly, map light 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
  • Map light assembly
  • Telephone microphone assembly
  • Radio and display receiver assembly
  • DCM (telematics transceiver)*
  • Harness or connector
  • *: w/ Manual (SOS) Switch

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • 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.

    for HV Model: Click here 2020 - 2021 MY RAV4 HV [10/2019 - 12/2021]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

    for Gasoline Model: Click here 2020 MY RAV4 [10/2019 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

  • When replacing the DCM (telematics transceiver), make sure to replace it with a new one.

HINT:

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 2020 - 2022 MY RAV4 RAV4 HV [10/2019 - 10/2022]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: PRECAUTION

PROCEDURE

1.

CHECK VEHICLE TYPE

(a) Check the vehicle type.

Result

Proceed to

w/ Manual (SOS) Switch

A

w/o Manual (SOS) Switch

B
B

GO TO STEP 5

A

2.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)

(a) Disconnect the G2 radio and display receiver assembly connector.

(b) Disconnect the P20*1 or P14*2 map light assembly connector.

  • *1: for TMC Made
  • *2: for TMMC Made

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

Standard Resistance:

for TMC Made

Tester Connection

Condition

Specified Condition

G2-25 (SNS2) - P20-6 (SNS2)

Always

Below 1 Ω

G2-25 (SNS2) - Body ground

Always

10 kΩ or higher

for TMMC Made

Tester Connection

Condition

Specified Condition

G2-25 (SNS2) - P14-5 (SNS2)

Always

Below 1 Ω

G2-25 (SNS2) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK HARNESS AND CONNECTOR (DCM [TELEMATICS TRANSCEIVER] - TELEPHONE MICROPHONE ASSEMBLY)

(a) Disconnect the G131 DCM (telematics transceiver) connector.

(b) Disconnect the P20*1 or P14*2 map light assembly connector.

  • *1: for TMC Made
  • *2: for TMMC Made

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

Standard Resistance:

for TMC Made

Tester Connection

Condition

Specified Condition

G131-7 (MCI-) - P20-7 (MCO-)

Always

Below 1 Ω

G131-7 (MCI-) - Body ground

Always

10 kΩ or higher

for TMMC Made

Tester Connection

Condition

Specified Condition

G131-7 (MCI-) - P14-6 (MCO-)

Always

Below 1 Ω

G131-7 (MCI-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK DCM (TELEMATICS TRANSCEIVER) (MCI-)

(a) Remove the DCM (telematics transceiver) with the connector(s) still connected.

Click here 2020 - 2022 MY RAV4 RAV4 HV [10/2019 - 10/2022]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

*a

Component with harness connected

(DCM [Telematics Transceiver])

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G131-7 (MCI-) - Body ground

Always

Below 1 Ω
OK

GO TO STEP 6

NG

REPLACE DCM (TELEMATICS TRANSCEIVER)

5.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY)

(a) Disconnect the G2 radio and display receiver assembly connector.

(b) Disconnect the P20*1 or P14*2 map light assembly connector.

  • *1: for TMC Made
  • *2: for TMMC Made

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

Standard Resistance:

for TMC Made

Tester Connection

Condition

Specified Condition

G2-25 (SNS2) - P20-6 (SNS2)

Always

Below 1 Ω

G2-22 (MIN-) - P20-7 (MCO-)

Always

Below 1 Ω

G2-25 (SNS2) - Body ground

Always

10 kΩ or higher

G2-22 (MIN-) - Body ground

Always

10 kΩ or higher

for TMMC Made

Tester Connection

Condition

Specified Condition

G2-25 (SNS2) - P14-5 (SNS2)

Always

Below 1 Ω

G2-22 (MIN-) - P14-6 (MCO-)

Always

Below 1 Ω

G2-25 (SNS2) - Body ground

Always

10 kΩ or higher

G2-22 (MIN-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

6.

INSPECT MAP LIGHT ASSEMBLY

(a) Remove the map light assembly.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; LIGHTING (INT): PERSONAL LIGHT: REMOVAL

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

Standard Resistance:

for TMC Made

Tester Connection

Condition

Specified Condition

6 (SNS2) - 7 (MCO-)

Always

Below 1 Ω

for TMMC Made

Tester Connection

Condition

Specified Condition

5 (SNS2) - 6 (MCO-)

Always

Below 1 Ω

*A

for TMC Made

*B

for TMMC Made

*a

Component without harness connected

(Map Light Assembly)
OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

7.

INSPECT MAP LIGHT ASSEMBLY

(a) Remove the map light assembly.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; LIGHTING (INT): PERSONAL LIGHT: REMOVAL

*A

for TMC Made

*B

for TMMC Made

*a

Component without harness connected

(Map Light Assembly [Wire Harness Side])

*b

Component without harness connected

(Map Light Assembly [Telephone Microphone Assembly Side])

(b) Disconnect the telephone microphone assembly connector.

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

Standard Resistance:

for TMC Made

Tester Connection

Condition

Specified Condition

6 (SNS2) - A-1 (SNS2)

Always

Below 1 Ω

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

Always

Below 1 Ω

for TMMC Made

Tester Connection

Condition

Specified Condition

5 (SNS2) - A-1 (SNS2)

Always

Below 1 Ω

6 (MCO-) - A-2 (MIC-)

Always

Below 1 Ω
OK

REPLACE TELEPHONE MICROPHONE ASSEMBLY

NG

REPLACE MAP LIGHT ASSEMBLY