With BOSE Sound System

Remove the rear speaker grille (A).

Fig 1: Removing Rear Speaker Grille
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the four mounting screws from the woofer.
Disconnect the 5P ('03 model) or 2P ('04-06 models) connector (B) and the woofer.
Install in the reverse order of removal.