ACTIVE NOISE CONTROL SYSTEM, Diagnostic DTC:B1AA696, B1AA71C

DTC Code DTC Name
B1AA696 Front Right Microphone Circuit Component Internal Failure
B1AA71C Front Right Microphone Circuit Circuit Voltage Out of Range

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
B1AA696 Front Right Microphone Circuit Component Internal Failure When the power switch is turned on (READY) and the engine speed is 1200 rpm or higher 3 seconds after the power switch is turned on (ACC), the stereo component equalizer assembly detects a malfunction in the No. 1 active noise control microphone for 4 seconds or more continuously*

  • Harness or connector

  • No. 1 active noise control microphone

  • Stereo component equalizer assembly
B1AA71C Front Right Microphone Circuit Circuit Voltage Out of Range When the stereo component equalizer assembly detects a No. 1 active noise control microphone connection malfunction for 4 seconds or more continuously 3 seconds after the power switch is turned on (ACC)*

  • Harness or connector

  • No. 1 active noise control microphone

  • Stereo component equalizer assembly

Tech Tips

*: Malfunction monitoring is not performed during the following conditions to prevent erroneous detection.


  • The auxiliary battery voltage is less than 9.5 V.

  • Before 3 seconds have elapsed after auxiliary battery voltage has returned to normal.

WIRING DIAGRAM

B004ARWE07
*a No. 1 Active Noise Control Microphone
*b Stereo Component Equalizer Assembly

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Active Noise Control > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Active Noise Control > Trouble Codes
      OK
      DTC B1AA696 and B1AA71C are not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT EQUALIZER ASSEMBLY - NO. 1 ACTIVE NOISE CONTROL MICROPHONE)


    1. Disconnect the X8 stereo component equalizer assembly connector.

    2. Disconnect the Z7 No. 1 active noise control microphone connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X8-7 (MC1+) - Z7-1 (MC1+) Always Below 1 Ω
      X8-21 (MC1-) - Z7-2 (MC1-) Always Below 1 Ω
      X8-7 (MC1+) - Body ground Always 10 kΩ or higher
      X8-21 (MC1-) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE NO. 1 ACTIVE NOISE CONTROL MICROPHONE


    1. Replace the No. 1 active noise control microphone with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Active Noise Control > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Active Noise Control > Trouble Codes
      OK
      DTC B1AA696 and B1AA71C are not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (NO. 1 ACTIVE NOISE CONTROL MICROPHONE IS DEFECTIVE)

    NG

    REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY Click here