Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Front Left Microphone Circuit Component Internal Failure (B1AA296,B1AA31C)

Toyota Avalon (XX50) 2019-2022 Service & Repair 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 No. 1 active noise control microphone 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 No. 1 active noise control microphone for 4 seconds or more continuously when engine speed is 1200 rpm or more*	Harness or connector No. 1 active noise control microphone Stereo component equalizer assembly
B1AA31C	Front Left Microphone Circuit Circuit Voltage Out of Range	Stereo component equalizer assembly detects No. 1 active noise control microphone connection malfunction for 4 seconds or more continuously*	Harness or connector No. 1 active noise control microphone Stereo component equalizer assembly

HINT:

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

After engine switch is turned on (ACC) for 3 seconds or more.
After the battery voltage returns to normal for 3 seconds.
Before 3 seconds have elapsed after 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

OK:

DTC B1AA296 and B1AA31C are not output.

USE SIMULATION METHOD TO CHECK

3.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY - NO. 1 ACTIVE NOISE CONTROL MICROPHONE)

(a) Disconnect the G68 stereo component equalizer assembly connector.

(b) Disconnect the O13 No. 1 active noise control microphone connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G68-7 (MC1+) - O13-1 (MC1+)	Always	Below 1 Ω
G68-21 (MC1-) - O13-2 (MC1-)	Always	Below 1 Ω
G68-7 (MC1+) or O13-1 (MC1+) - Body ground	Always	10 kΩ or higher
G68-21 (MC1-) or O13-2 (MC1-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	REPLACE NO. 1 ACTIVE NOISE CONTROL MICROPHONE

(a) Replace the No. 1 active noise control microphone 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

OK:

DTC B1AA296 and B1AA31C are not output.

END (NO. 1 ACTIVE NOISE CONTROL MICROPHONE IS DEFECTIVE)

REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY

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