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Audio System Symptom Troubleshooting - Volume is too high or too low when driving at freeway speeds

Volume is too high or too low when driving at freeway speeds
  1. Test-drive the vehicle at highway speeds and monitor volume level.
Is the volume level too high or too low?
YES -
Go to Step 2 .
NO -
internal failre, the system is OK at this time.■
  1. Change SVC mode setting in sound adjustment set-up to MID and retest.
Is the volume level still too high, or too low?
YES -
NO -
Improper (SVC) setting for the customer's sound preference, Advise the customer to try different SVC settings.■