LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2021 >> NX 300 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Active Sound Control (ASC) System - Diagnostics - Introduction >> ASC System >> System Description [09/2017 - ] >> System Description [09/2017 - ]
April 5, 2026: LEMON Manuals is launched! Read the announcement.

System Description [09/2017 - ]

  1. ASC SYSTEM 
    1. The ASC system uses a stereo component equalizer assembly to electronically generate a driving sound. Simulated engine sounds are output from the No. 1 speaker assembly with box.

      The simulated engine sounds are calculated in accordance with vehicle information, such as the engine speed, drive mode, vehicle speed, shift lever position and accelerator pedal opening angle. The sounds can be turned on and off and the volume can be adjusted via operation of the vehicle sound switch.

    2. The following sounds can be output.
      1. w/ Adaptive Variable Suspension System:
        1. Additional engine sound
          • Specially designed engine sounds which are synchronized with the engine speed and output when the vehicle is being driven.
          • Generated when the vehicle speed is 6 km/h (4 mph) or more and engine speed is 980 rpm or more.
            ADDITIONAL ENGINE SOUND GENERATION CONDITIONS

            Item Condition Remark
            Drive mode Normal Sport S Sport S+ Customize* -
            Shift lever position R, D, M -
            Vehicle speed 6 km/h (4 mph) or more When all of the conditions are met, additional engine sounds are generated.
            Engine speed 980 rpm or more
            Gear - -
            1. *: Customize mode refers to when the following conditions are set on the multi-display customize setting screen. [Setup]→[Vehicle]→[Drive Mode Customization]→[Powertrain]→[Power] or [Normal]

              Refer to CUSTOMIZE PARAMETERS [09/2017 - ]

        2. Intake flow noise
          • Specially designed intake flow noise which is output when the throttle valve is opened rapidly and intake airflow increases.
          • Generated when the engine is running and the accelerator pedal is depressed rapidly.
            INTAKE FLOW NOISE GENERATION CONDITIONS

            Item Condition Remark
            Drive mode Sport S+ mode -
            Shift lever position P, R, N, D, M -
            Vehicle speed 0 km/h (0 mph) or more and 1 km/h (1 mph) or less, or more than 100 km/h (62 mph) and 250 km/h (155 mph) or less -
            Engine speed Between 1300 rpm and 5000 rpm -
            Accelerator pedal opening angle Opening angle range:
            Between 15% and 70%
            Condition:
            When the accelerator pedal opening angle increases 15% or more in 0.01 seconds
            To generate additional intake flow noise again, decrease the accelerator pedal opening angle to below 10%.
            Gear - -
        3. Exhaust pulsation sound
          • Specially designed exhaust pulsation sound which simulates the sound of unburned exhaust gases combusting in and around the exhaust pipe.
          • Generated when the vehicle is being driven with the accelerator pedal depressed, and the accelerator pedal is suddenly released.
            EXHAUST PULSATION SOUND GENERATION CONDITIONS

            Item Condition Remark
            Drive mode Sport S+ mode -
            Shift lever position D, M -
            Vehicle speed 75 km/h (47 mph) or more -
            Engine speed - -
            Accelerator pedal opening angle From 80% or more to 0% within 0.18 seconds -
            Gear 3rd or less -
        4. SID (S+ sound)
          • SID (S+ sound) sound generation conditions:

            With the engine switch on (IG) and the vehicle sound switch ON, the drive mode is changed to Sport S+.

      2. w/o Adaptive Variable Suspension System:
        1. Additional engine sound
          • Specially designed engine sounds which are synchronized with the engine speed and output when the vehicle is being driven.
          • Generated when the vehicle speed is 6 km/h (4 mph) or more and engine speed is 980 rpm or more.
            ADDITIONAL ENGINE SOUND GENERATION CONDITIONS

            Item Condition Remark
            Drive mode Normal Sport Customize* -
            Shift lever position R, D, M -
            Vehicle speed 6 km/h (4 mph) or more When all of the conditions are met, additional engine sounds are generated.
            Engine speed 980 rpm or more
            Gear - -
            1. *: Customize mode refers to when the following conditions are set on the multi-display customize setting screen. [Setup]→[Vehicle]→[Drive Mode Customization]→[Powertrain]→[Power] or [Normal]

              Refer to CUSTOMIZE PARAMETERS [09/2017 - ]