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

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

OK:

DTC B1AA296 and B1AA31C are not output.

OK

USE SIMULATION METHOD TO CHECK

NG

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.

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

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
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

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

NEXT

5.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Active Noise Control > Clear DTCs
NEXT

6.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Active Noise Control > Trouble Codes

OK:

DTC B1AA296 and B1AA31C are not output.

OK

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

REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY

    UART Communication Between ANC and Audio Amplifier Missing Message (B1AA187)

    Front Right Microphone Circuit Component Internal Failure (B1AA696,B1AA71C)

    See More:

    Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Telematics System(for Gasoline Model): How To Proceed With Troubleshooting
    CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the telematics system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT 2. CUSTOMER PROBLEM ANALYSIS HINT: In troubleshooting, check that the problem symptoms have been accurately identified. Preconceptions ...

    Toyota Avalon (XX50) 2019-2022 Owners Manual

    Toyota Avalon (XX50) 2019-2022 Service & Repair Manual

    © 2025 Copyright www.tavalon.net
    0.0113