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Home >> Chevrolet >> 2010 >> Cobalt LS, 4D Sedan, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 59 (Audio System) >> Sound Quality Diagnosis >> Frequency Sweep

Frequency Sweep

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.

Do this test to find rattles or reverberations that may cause a perception of poor sound quality.

  1. Insert the audio diagnostic CD (T/N 07AAZ-SDBA100) into the audio unit or the audio-navigation unit.
  2. Play track No. 13 (sweep from 500 Hz to 35 Hz) at a normal, or slightly higher than normal, volume level.
  3. Listen to each speaker for poor sound quality or reverberations caused by specific frequencies. Use the voice-over to estimate the frequency that causes the vibration. Use the audio system's fader and balance settings to help isolate the channel with the problem.
    • If vibrations or poor sound quality are heard, go to step 4.
    • If no vibrations or poor sound quality are heard, go to SOUND JUDGING .
  4. Choose the appropriate track from No. 14 to 25 (small range frequency sweep) or 26 to 53 (single frequencies) to recreate the frequency that caused the poor sound quality or vibration witnessed in step 3; this aids in diagnosis of the cause.
    NOTE: When you get to the track that recreates the problem, select the repeat function on the audio system, this will help you isolate the cause.
  5. Replace or insulate the source of the vibration or, if the speaker is the source of the poor sound quality, replace it.