Toyota Yaris: Active Noise Control System / Rear Door Right Speaker Circuit Actuator Stuck (B1AB271)

Toyota Yaris XP210 (2020-2026) Reapir and Service Manual / Audio & Visual & Telematics / Audio / Video / Active Noise Control System / Rear Door Right Speaker Circuit Actuator Stuck (B1AB271)

DESCRIPTION

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1AB271	Rear Door Right Speaker Circuit Actuator Stuck	When starting the system from IG OFF → ACC ON, the stereo component equalizer assembly detects a malfunction in the right side rear speaker system*	Harness or connector Rear speaker assembly RH 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 B1AB271 is not output	A
DTC B1AB271 is output	B

USE SIMULATION METHOD TO CHECK

3.	CHECK HARNESS AND CONNECTOR (REAR SPEAKER ASSEMBLY RH - STEREO COMPONENT EQUALIZER ASSEMBLY)

(a) Disconnect the O115 rear speaker assembly RH connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O115-2 - O131-10 (RR+)	Always	Below 1 Ω
O115-1 - O131-25 (RR-)	Always	Below 1 Ω
O115-2 - Body ground	Always	10 kΩ or higher
O115-1 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	INSPECT REAR SPEAKER ASSEMBLY RH

Click here

OK:

Malfunction disappears.

REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY

REPLACE REAR SPEAKER ASSEMBLY RH

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