Lexus ES: 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* |
|
| 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* |
|
HINT:
*: Malfunction monitoring is not performed under the following conditions, in order to prevent erroneous detection.
- After power switch is turned on (ACC) for 3 seconds or more.
- After the auxiliary battery voltage returns to normal for 3 seconds.
- Before 3 seconds have elapsed after auxiliary battery voltage has 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 with all of the detection conditions met.
Body Electrical > Active Noise Control > Trouble CodesOK:
No DTCs are output.
| OK |  | USE SIMULATION METHOD TO CHECK |
|
| 3. | CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY - NO. 1 ACTIVE NOISE CONTROL MICROPHONE) |
(a) Disconnect the G15 stereo component equalizer assembly connector.
(b) Disconnect the P15 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 |
|---|---|---|
| G15-7 (MC1+) - P15-1 (MC1+) | Always | Below 1 Ω |
| G15-21 (MC1-) - P15-2 (MC1-) | Always | Below 1 Ω |
| G15-7 (MC1+) or P15-1 (MC1+) - Body ground | Always | 10 kΩ or higher |
| G15-21 (MC1-) or P15-2 (MC1-) - Body ground | Always | 10 kΩ or higher |
| NG | | 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 .gif)
|
| 5. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Active Noise Control > Clear DTCs
|
| 6. | CHECK FOR DTC |
(a) Check for DTCs with all of the detection conditions met.
Body Electrical > Active Noise Control > Trouble CodesOK:
No DTCs are output.
| OK | | END (NO. 1 ACTIVE NOISE CONTROL MICROPHONE IS DEFECTIVE) |
| NG | | REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY |
READ NEXT:
Front Right Microphone Circuit Component Internal Failure (B1AA696,B1AA71C)
DESCRIPTION These DTCs are stored when a malfunction occurs in the No. 2 active noise control microphone system. DTC No. Detection Item DTC Detection Condition Trouble Area B1AA696 Fron
Rear Center Microphone Circuit Component Internal Failure (B1AAA96,B1AAB1C)
DESCRIPTION These DTCs are stored when a malfunction occurs in the No. 3 active noise control microphone system. DTC No. Detection Item DTC Detection Condition Trouble Area B1AAA96 Rear
Data List / Active Test
DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the following table, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether
SEE MORE:
Yaw Rate Sensor Circuit Voltage Out of Range (C00631C)
DESCRIPTION The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition. The skid control ECU (brake actuator assembly) calibrates the sensitivity of the yaw rate sensor (airbag ECU assembly) based on signals from the steering angle sensor and speed sens
Reassembly
REASSEMBLY PROCEDURE 1. INSTALL VACUUM PUMP VANE (a) Apply engine oil to the vacuum pump vane and vacuum pump vane caps and install the vacuum pump vane caps to the vacuum pump vane. (b) Apply engine oil to the vacuum pump vane with vacuum pump vane caps and install it to the vacuum pump housing. NO
