GM Service Manual Online
For 1990-2009 cars only

Diagnose the horn's quality:

    • A harsh tone results from loose bolts in the sheet metal mounting area.
    • A low pitch moan results from too high a current. Adjust the horn as necessary.
    • A weak tone results from too low a current. Adjust the horn as necessary.
    • A weak strained tone results from a foreign body in the horn that should be shaken out or removed.
    • A harsh vibration is caused by the horn contacting the sheet metal. Bend the bracket in order to give the horn clearance and freedom from interference.