Toyota Yaris: Active Noise Control System / Rear Door Left Speaker Circuit Actuator Stuck (B1AB071)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Audio & Visual & Telematics / Audio / Video / Active Noise Control System / Rear Door Left Speaker Circuit Actuator Stuck (B1AB071)

DESCRIPTION

This DTC is output when a malfunction occurs in the left side rear speaker system.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1AB071

Rear Door Left Speaker Circuit Actuator Stuck

When starting the system from IG OFF → ACC ON, the stereo component equalizer assembly detects a malfunction in the left side rear speaker system*

  • Harness or connector
  • Rear speaker assembly LH
  • Stereo component equalizer assembly

HINT:

*: To prevent false positives, fault monitoring is not performed in the following conditions:

  • Auxiliary battery voltage has decreased to 9.5 V or less.
  • Less than 3 seconds have elapsed after auxiliary battery voltage returned to normal.

WIRING DIAGRAM

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

Result

Proceed to

DTC B1AB071 is not output

A

DTC B1AB071 is output

B

A

USE SIMULATION METHOD TO CHECK

B

3.

CHECK HARNESS AND CONNECTOR (REAR SPEAKER ASSEMBLY LH - STEREO COMPONENT EQUALIZER ASSEMBLY)

(a) Disconnect the O114 rear speaker assembly LH connector.

(b) Disconnect the O131 stereo component equalizer assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O114-2 - O131-11 (RL+)

Always

Below 1 Ω

O114-1 - O131-26 (RL-)

Always

Below 1 Ω

O114-2 - Body ground

Always

10 kΩ or higher

O114-1 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

INSPECT REAR SPEAKER ASSEMBLY LH

Click here

OK:

Malfunction disappears.

OK

REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY

NG

REPLACE REAR SPEAKER ASSEMBLY LH

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