Toyota Yaris: Active Noise Control System / Front Door Right Speaker Circuit Actuator Stuck (B1AAF71)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Audio & Visual & Telematics / Audio / Video / Active Noise Control System / Front Door Right Speaker Circuit Actuator Stuck (B1AAF71)

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1AAF71

Front 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 front speaker system*

  • Harness or connector
  • Front No. 1 speaker assembly RH
  • Front No. 2 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

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

Result

Proceed to

DTC B1AAF71 is not output

A

DTC B1AAF71 is output

B

A

USE SIMULATION METHOD TO CHECK

B

3.

CHECK HARNESS AND CONNECTOR (FRONT NO. 2 SPEAKER ASSEMBLY RH - STEREO COMPONENT EQUALIZER ASSEMBLY)

(a) Disconnect the H88 front No. 2 speaker assembly RH connector.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H88-3 (+) - O131-12 (FR+)

Always

Below 1 Ω

H88-1 (-) - O131-27 (FR-)

Always

Below 1 Ω

H88-3 (+) - Body ground

Always

10 kΩ or higher

H88-1 (-) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (FRONT NO. 1 SPEAKER ASSEMBLY RH - FRONT NO. 2 SPEAKER ASSEMBLY RH)

(a) Disconnect the K2 front No. 1 speaker assembly RH connector.

(b) Disconnect the H88 front No. 2 speaker assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K2-2 - H88-4 (TWR+)

Always

Below 1 Ω

K2-1 - H88-2 (TWR-)

Always

Below 1 Ω

K2-2 - Body ground

Always

10 kΩ or higher

K2-1 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

INSPECT FRONT NO. 1 SPEAKER ASSEMBLY RH

Click here

OK:

Malfunction disappears.

NG

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY RH

OK

6.

INSPECT FRONT NO. 2 SPEAKER ASSEMBLY RH

Click here

OK:

Malfunction disappears.

OK

REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY

NG

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY RH

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