Toyota Yaris: Active Noise Control System / Front Door Left Speaker Circuit Actuator Stuck (B1AAE71)
DESCRIPTION
This DTC is output when a malfunction occurs in the left side front speaker system.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1AAE71 | Front Door Left Speaker Circuit Actuator Stuck | When starting the system from IG OFF → ACC ON, the stereo component equalizer assembly detects a malfunction in the left side front speaker system* |
|
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
|
| 2. | CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Active Noise Control > Trouble Codes| Result | Proceed to |
|---|---|
| DTC B1AAE71 is not output | A |
| DTC B1AAE71 is output | B |
| A |
 | USE SIMULATION METHOD TO CHECK |
|
| 3. | CHECK HARNESS AND CONNECTOR (FRONT NO. 2 SPEAKER ASSEMBLY LH - STEREO COMPONENT EQUALIZER ASSEMBLY) |
(a) Disconnect the H87 front No. 2 speaker assembly LH 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 |
|---|---|---|
| H87-3 (+) - O131-13 (FL+) | Always | Below 1 Ω |
| H87-1 (-) - O131-28 (FL-) | Always | Below 1 Ω |
| H87-3 (+) - Body ground | Always | 10 kΩ or higher |
| H87-1 (-) - Body ground | Always | 10 kΩ or higher |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK HARNESS AND CONNECTOR (FRONT NO. 1 SPEAKER ASSEMBLY LH - FRONT NO. 2 SPEAKER ASSEMBLY LH) |
(a) Disconnect the L2 front No. 1 speaker assembly LH connector.
(b) Disconnect the H87 front No. 2 speaker assembly LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| L2-2 - H87-4 (TWL+) | Always | Below 1 Ω |
| L2-1 - H87-2 (TWL-) | Always | Below 1 Ω |
| L2-2 - Body ground | Always | 10 kΩ or higher |
| L2-1 - Body ground | Always | 10 kΩ or higher |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | INSPECT FRONT NO. 1 SPEAKER ASSEMBLY LH |
Click here
OK:
Malfunction disappears.
| NG |
 | REPLACE FRONT NO. 1 SPEAKER ASSEMBLY LH |
|
| 6. | INSPECT FRONT NO. 2 SPEAKER ASSEMBLY LH |
Click here
OK:
Malfunction disappears.
| OK |
 | REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY |
| NG |
 | REPLACE FRONT NO. 2 SPEAKER ASSEMBLY LH |
Front Right Microphone Circuit Component Internal Failure (B1AA696,B1AA71C)
DESCRIPTION These DTCs are stored when a malfunction occurs in the active noise control microphone RH system. DTC No. Detection Item DTC Detection Condition Trouble Area B1AA696 Front Right Microphone Circuit Component Internal Failure Stereo component equalizer assembly detects malfunction in active noise control microphone RH for 4 seconds or more continuously when engine speed is 1200 rpm or more*
Harness or connector
Active noise control microphone RH
Stereo component equalizer assembly
B1AA71C Front Right Microphone Circuit Circuit Voltage Out of Range Stereo component equalizer assembly detects active noise control microphone RH connection malfunction for 4 seconds or more continuously*
Harness or connector
Active noise control microphone RH
Stereo component equalizer assembly
HINT: *: Malfunction monitoring is not performed under the following conditions, in order to prevent erroneous detection...
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...
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Supplemental Restraint System (SRS) Precautions
The front and side supplemental restraint systems (SRS) include different types of air bags. Please verify the different types of air bags which are equipped on your vehicle by locating the “SRS AIRBAG” location indicators. These indicators are visible in the area where the air bags are installed.
The air bags are installed in the following locations:
The steering wheel hub (driver air bag) The front passenger dashboard (front passenger air bag) The outboard sides of the front seatbacks (side air bags) The front and rear window pillars, and the roof edge along both sides (curtain air bags)