Tweeter Inspection

Disconnect the negative battery cable.
Remove the inner garnish. (See INNER GARNISH REMOVAL/INSTALLATION ).
Remove the tweeter. (See TWEETER REMOVAL/INSTALLATION ).
Verify the resistance between tweeter terminals.
- If not within the specification, replace the tweeter.
  
  Fig 1: Tweeter Continuity Chart
  Courtesy of FORD MOTOR CO.
  
  Fig 2: Identifying Tweeter Connector Terminals
  Courtesy of FORD MOTOR CO.
Resistance

Without Bose®: 4.0 ohms

With Bose®: 3.4 ohms