Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000026LIV
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 -           ]
Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Single Knob Type): B1ACB71; Front Left Speaker Cable Actuator Stuck; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]

DTC

B1ACB71

Front Left Speaker Cable Actuator Stuck

DESCRIPTION

This DTC is stored when the stereo component amplifier assembly detects an open in the front speaker LH circuit by energizing the speaker line.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

Priority

B1ACB71

Front Left Speaker Line Cable Actuator Stuck

Open in the front speaker LH circuit is detected.

(1 trip detection logic)

  • Harness or connector
  • Stereo component amplifier assembly
  • Front No. 1 speaker assembly LH
  • Front No. 2 speaker assembly LH
  • Front No. 3 speaker assembly LH

Navigation System

A

WIRING DIAGRAM

FRONT NO. 1 SPEAKER ASSEMBLY LH and FRONT NO. 3 SPEAKER ASSEMBLY LH
FRONT NO. 2 SPEAKER ASSEMBLY LH

PROCEDURE

1.

CHECK PROBLEM SYMPTOM

(a) Confirm the problem symptoms and proceed to the respective link.

Result

Proceed to

No sound is output from the front No. 1 speaker assembly LH or front No. 3 speaker assembly LH

A

No sound is output from the front No. 2 speaker assembly LH

B

B

GO TO STEP 8

A

2.

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - FRONT NO. 3 SPEAKER ASSEMBLY LH)

(a) Disconnect the I54 stereo component amplifier assembly connector.

(b) Disconnect the I75 front No. 3 speaker assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I54-13 (FL+) - I75-4 (+TW)

Always

Below 1 Ω

I54-28 (FL-) - I75-2 (-TW)

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK HARNESS AND CONNECTOR (FRONT NO. 1 SPEAKER ASSEMBLY LH - FRONT NO. 3 SPEAKER ASSEMBLY LH)

(a) Disconnect the I75 front No. 3 speaker assembly LH connector.

(b) Disconnect the L1 front No. 1 speaker assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I75-3 (+) - L1-2

Always

Below 1 Ω

I75-1 (-) - L1-1

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT FRONT NO. 1 SPEAKER ASSEMBLY LH

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 LH

OK

5.

CHECK FOR DTC

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(b) In accordance with the display of the GTS, perform a speaker circuit energization inspection.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Single Knob Type): UTILITY

Body Electrical > Navigation System > Utility

Tester Display

Speaker Line Electricity Check

(c) Check for DTCs and proceed to the following step.

Body Electrical > Navigation System > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC B1ACB71 is output

B

A

END (FRONT NO. 1 SPEAKER ASSEMBLY LH IS DEFECTIVE)

B

6.

REPLACE FRONT NO. 3 SPEAKER ASSEMBLY LH

(a) Replace the speaker assembly with a new or known good one.

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

NEXT

7.

CHECK FOR DTC

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(b) In accordance with the display of the GTS, perform a speaker circuit energization inspection.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Single Knob Type): UTILITY

Body Electrical > Navigation System > Utility

Tester Display

Speaker Line Electricity Check

(c) Check for DTCs and proceed to the following step.

Body Electrical > Navigation System > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC B1ACB71 is output

B

A

END (FRONT NO. 3 SPEAKER ASSEMBLY LH IS DEFECTIVE)

B

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: STEREO COMPONENT AMPLIFIER: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: STEREO COMPONENT AMPLIFIER: REMOVAL

8.

CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - FRONT NO. 2 SPEAKER ASSEMBLY LH)

(a) Disconnect the I54 stereo component amplifier assembly connector.

(b) Disconnect the I7 front no. 2 speaker assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I54-12 (TWL+) - I7-2

Always

Below 1 Ω

I54-27 (TWL-) - I7-1

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY LH

(a) Replace the speaker assembly with a new or known good one.

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

NEXT

10.

CHECK FOR DTC

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

(b) In accordance with the display of the GTS, perform a speaker circuit energization inspection.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (for Single Knob Type): UTILITY

Body Electrical > Navigation System > Utility

Tester Display

Speaker Line Electricity Check

(c) Check for DTCs and proceed to the following step.

Body Electrical > Navigation System > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC B1ACB71 is output

B

A

END (FRONT NO. 2 SPEAKER ASSEMBLY LH IS DEFECTIVE)

B

REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; AUDIO / VIDEO: STEREO COMPONENT AMPLIFIER: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; AUDIO / VIDEO: STEREO COMPONENT AMPLIFIER: REMOVAL