Toyota Yaris: Active Noise Control System / Front Left Microphone Circuit Component Internal Failure (B1AA296,B1AA31C)

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Audio & Visual & Telematics / Audio / Video / Active Noise Control System / Front Left Microphone Circuit Component Internal Failure (B1AA296,B1AA31C)

DESCRIPTION

These DTCs are stored when a malfunction occurs in the active noise control microphone LH system.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1AA296	Front Left Microphone Circuit Component Internal Failure	Stereo component equalizer assembly detects malfunction in active noise control microphone LH for 4 seconds or more continuously when engine speed is 1200 rpm or more*	Harness or connector Active noise control microphone LH Stereo component equalizer assembly
B1AA31C	Front Left Microphone Circuit Circuit Voltage Out of Range	Stereo component equalizer assembly detects active noise control microphone LH connection malfunction for 4 seconds or more continuously*	Harness or connector Active noise control microphone LH Stereo component equalizer assembly

HINT:

*: Malfunction monitoring is not performed under the following conditions, in order to prevent erroneous detection.

After ignition switch is turned to ACC for 3 seconds or more.
After the auxiliary battery voltage returns to normal for 3 seconds.
Before 3 seconds have elapsed after auxiliary battery voltage has 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 B1AA296 and B1AA31C are not output	A
DTC B1AA296 and B1AA31C are output	B

USE SIMULATION METHOD TO CHECK

3.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY - ACTIVE NOISE CONTROL MICROPHONE LH)

(a) Disconnect the O132 stereo component equalizer assembly connector.

(b) Disconnect the V12 active noise control microphone LH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
O132-1 (MC1+) - V12-1 (MC1+)	Always	Below 1 Ω
O132-5 (MC1-) - V12-2 (MC1-)	Always	Below 1 Ω
O132-1 (MC1+) - Body ground	Always	10 kΩ or higher
O132-5 (MC1-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	REPLACE ACTIVE NOISE CONTROL MICROPHONE LH

(a) Replace the active noise control microphone LH with a new or known good one.

Click here

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs

6.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

Result	Proceed to
DTC B1AA296 and B1AA31C are not output	A
DTC B1AA296 and B1AA31C are output	B

END (ACTIVE NOISE CONTROL MICROPHONE LH IS DEFECTIVE)

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