ASC SYSTEM Main Switch Circuit

DESCRIPTION

The stereo component equalizer assembly detects vehicle sound switch signals.

The ASC system can be turned on and off by operating the vehicle sound switch.

WIRING DIAGRAM

A01MTJQE01

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / ASC / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > ASC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Volume SW Vehicle sound switch on/off status OFF or ON

      OFF: Vehicle sound switch off

      ON: Vehicle sound switch on

      		 -

      Body Electrical > ASC > Data List
      Tester Display
      Volume SW
      OK
      Normal conditions listed above are displayed.
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. INSPECT VEHICLE SOUND SWITCH


    1. A01MT6HC07
      *a

      Component without harness connected

      (Vehicle Sound Switch)
      *b Switch Indicator

      Check the vehicle sound switch on/off operation.


      1. Remove the vehicle sound switch.

        Click here

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        3 (NVI) - 8 (NVS) Vehicle sound switch on Below 1 Ω
        3 (NVI) - 8 (NVS) Vehicle sound switch off 10 kΩ or higher

    2. Inspect the switch indicator.


      1. Apply auxiliary battery voltage to the vehicle sound switch connector and check that the switch indicator comes on.

        OK
        Measurement Condition Condition Specified Condition

        Auxiliary battery positive (+) → 8 (NVS)

        Auxiliary battery negative (-) → 4 (E)

        		 Vehicle sound switch on Switch indicator comes on
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE VEHICLE SOUND SWITCH Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (VEHICLE SOUND SWITCH - STEREO COMPONENT EQUALIZER ASSEMBLY)


    1. Disconnect the K36 stereo component equalizer assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K37-3 (NVI) - K36-5 (VLSW) Always Below 1 Ω
      K37-3 (NVI) - Body ground Always 10 kΩ or higher
      K37-4 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY for LHD: Click here
    REPLACE STEREO COMPONENT EQUALIZER ASSEMBLY for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR