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)

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