Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001G6UQ
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 04/2020]
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for HV Model with Dual Knob Type): Speaker Circuit; 2020 MY Corolla Corolla HV [01/2019 - 04/2020]

Speaker Circuit

DESCRIPTION

  • If there is a short in a speaker circuit, the radio and display receiver assembly detects it and stops output to the speakers.

    Thus sound cannot be heard from the speakers even if there is no malfunction in the radio and display receiver assembly, DCM (telematics transceiver)* or speakers.

  • *: w/ Manual (SOS) Switch

WIRING DIAGRAM

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 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for HV Model with Dual Knob Type): PRECAUTION

  • Before replacing the DCM (telematics transceiver), refer to Registration.

    Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION

PROCEDURE

1.

CHECK SPEAKER (OPERATION CHECK)

(a) Enter the "System Check Mode" screen. Refer to Check Speaker in Operation Check.

Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for HV Model with Dual Knob Type): OPERATION CHECK

(b) Perform the operation check above and determine the speaker that is not operating.

Not Operating Speaker

Proceed to

Front No. 1 speaker assembly or front No. 2 speaker assembly

(w/o Manual (SOS) Switch)

A

Front No. 1 speaker assembly or front No. 2 speaker assembly

(w/ Manual (SOS) Switch)

B

Rear speaker assembly

C

HINT:

If sound cannot be heard from any speaker, inspect all of them.

B

GO TO STEP 3

C

GO TO STEP 7

A

2.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - FRONT NO. 1 SPEAKER ASSEMBLY - FRONT NO. 2 SPEAKER ASSEMBLY)

(a) Disconnect the I71 radio and display receiver assembly connector.

(b) Disconnect the K1 and L1 front No. 1 speaker assembly connectors.

(c) Disconnect the I76 and I77 front No. 2 speaker assembly connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I71-1 (FR+) - I76-4 (TWR+)

Always

Below 1 Ω

I71-6 (FR-) - I76-2 (TWR-)

Always

Below 1 Ω

I71-2 (FL+) - I77-4 (TWL+)

Always

Below 1 Ω

I71-7 (FL-) - I77-2 (TWL-)

Always

Below 1 Ω

K1-2 - I76-3 (+)

Always

Below 1 Ω

K1-1 - I76-1 (-)

Always

Below 1 Ω

L1-2 - I77-3 (+)

Always

Below 1 Ω

L1-1 - I77-1 (-)

Always

Below 1 Ω

I71-1 (FR+) or I76-4 (TWR+) - Body ground

Always

10 kΩ or higher

I71-6 (FR-) or I76-2 (TWR-) - Body ground

Always

10 kΩ or higher

I71-2 (FL+) or I77-4 (TWL+) - Body ground

Always

10 kΩ or higher

I71-7 (FL-) or I77-2 (TWL-) - Body ground

Always

10 kΩ or higher

K1-2 or I76-3 (+) - Body ground

Always

10 kΩ or higher

K1-1 or I76-1 (-) - Body ground

Always

10 kΩ or higher

L1-2 or I77-3 (+) - Body ground

Always

10 kΩ or higher

L1-1 or I77-1 (-) - Body ground

Always

10 kΩ or higher
OK

GO TO STEP 5

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - DCM (TELEMATICS TRANSCEIVER) - FRONT NO. 1 SPEAKER ASSEMBLY - FRONT NO. 2 SPEAKER ASSEMBLY)

(a) Disconnect the I71 radio and display receiver assembly connector.

(b) Disconnect the K1 and L1 front No. 1 speaker assembly connectors.

(c) Disconnect the I76 and I77 front No. 2 speaker assembly connectors.

(d) Disconnect the I72 DCM (telematics transceiver) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I71-1 (FR+) - I72-2 (SPI+)

Always

Below 1 Ω

I71-6 (FR-) - I72-3 (SPI-)

Always

Below 1 Ω

I72-5 (SPO+) - I76-4 (TWR+)

Always

Below 1 Ω

I72-6 (SPO-) - I76-2 (TWR-)

Always

Below 1 Ω

I71-2 (FL+) - I77-4 (TWL+)

Always

Below 1 Ω

I71-7 (FL-) - I77-2 (TWL-)

Always

Below 1 Ω

K1-2 - I76-3 (+)

Always

Below 1 Ω

K1-1 - I76-1 (-)

Always

Below 1 Ω

L1-2 - I77-3 (+)

Always

Below 1 Ω

L1-1 - I77-1 (-)

Always

Below 1 Ω

I71-1 (FR+) or I72-2 (SPI+) - Body ground

Always

10 kΩ or higher

I71-6 (FR-) or I72-3 (SPI-) - Body ground

Always

10 kΩ or higher

I71-2 (FL+) or I77-4 (TWL+) - Body ground

Always

10 kΩ or higher

I71-7 (FL-) or I77-2 (TWL-) - Body ground

Always

10 kΩ or higher

I72-5 (SPO+) or I76-4 (TWR+) - Body ground

Always

10 kΩ or higher

I72-6 (SPO-) or I76-2 (TWR-) - Body ground

Always

10 kΩ or higher

K1-2 or I76-3 (+) - Body ground

Always

10 kΩ or higher

K1-1 or I76-1 (-) - Body ground

Always

10 kΩ or higher

L1-2 or I77-3 (+) - Body ground

Always

10 kΩ or higher

L1-1 or I77-1 (-) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

INSPECT DCM (TELEMATICS TRANSCEIVER)

(a) Remove the DCM (telematics transceiver).

Click here 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2019]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 (SPI+) - 5 (SPO+)

Always

Below 1 Ω

3 (SPI-) - 6 (SPO-)

Always

Below 1 Ω

2 (SPI+) - 3 (SPI-)

Always

10 kΩ or higher

5 (SPO+) - 6 (SPO-)

Always

10 kΩ or higher

2 (SPI+) or 5 (SPO+) - Body ground

Always

10 kΩ or higher

3 (SPI-) or 6 (SPO-) - Body ground

Always

10 kΩ or higher

*a

Component without harness connected

(DCM (Telematics Transceiver))
NG

REPLACE DCM (TELEMATICS TRANSCEIVER) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2019]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2019 - 04/2020]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

OK

5.

INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

(a) Remove the front No. 1 speaker assembly.

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; AUDIO / VIDEO: FRONT DOOR SPEAKER: REMOVAL

(b) Inspect the front No. 1 speaker assembly.

Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 -        ]; AUDIO / VIDEO: FRONT DOOR SPEAKER: INSPECTION

NG

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

OK

6.

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

(a) Remove the front No. 2 speaker assembly.

Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 -        ]; AUDIO / VIDEO: INSTRUMENT PANEL SPEAKER: REMOVAL

(b) Inspect the front No. 2 speaker assembly.

Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 -        ]; AUDIO / VIDEO: INSTRUMENT PANEL SPEAKER: INSPECTION

OK:

Malfunction disappears.

OK

END
NG

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

7.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - REAR SPEAKER ASSEMBLY)

(a) Disconnect the I71 radio and display receiver assembly connector.

(b) Disconnect the N4 and M4 rear speaker assembly connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I71-4 (RR+) - M4-2

Always

Below 1 Ω

I71-9 (RR-) - M4-1

Always

Below 1 Ω

I71-3 (RL+) - N4-2

Always

Below 1 Ω

I71-8 (RL-) - N4-1

Always

Below 1 Ω

I71-4 (RR+) or M4-2 - Body ground

Always

10 kΩ or higher

I71-9 (RR-) or M4-1 - Body ground

Always

10 kΩ or higher

I71-3 (RL+) or N4-2 - Body ground

Always

10 kΩ or higher

I71-8 (RL-) or N4-1 - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

INSPECT REAR SPEAKER ASSEMBLY

(a) Remove the rear speaker assembly.

Click here 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; AUDIO / VIDEO: REAR DOOR SPEAKER: REMOVAL

(b) Inspect the rear speaker assembly.

Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 -        ]; AUDIO / VIDEO: REAR DOOR SPEAKER: INSPECTION

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE REAR SPEAKER ASSEMBLY