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 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
|
| 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 |
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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
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Installation
INSTALLATION CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
PROCEDURE 1. INSTALL HEADLIGHT ASSEMBLY Click here 2. INSTALL FRONT FENDER SPLASH SHIELD SUB-ASSEMBLY Click here 3. INSTALL COWL TOP PANEL INSULATOR
Removal
REMOVAL CAUTION / NOTICE / HINT The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed and installed, or replaced during front bumper assembly removal/installation are shown below. Necessary Procedure After Parts Removed/Ins
