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

Toyota Yaris XP210 (2020-2025) 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

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

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

USE SIMULATION METHOD TO CHECK

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT REAR SPEAKER ASSEMBLY LH

Click here

OK:

Malfunction disappears.

REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY

REPLACE REAR SPEAKER ASSEMBLY LH

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