How to Update the Speakers in a '99 300M

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    Front Door Speakers

    • 1). Insert the tip of a panel tool under the edge of the speaker grille in the lower front corner of the door. Pry around the edges until the grille pops off.

    • 2). Remove three Torx T20 screws from the edge of the speaker with a Torx T20 driver and pull the speaker out of the door.

    • 3). Unplug the connector on the back of the speaker. Plug the new speaker into the connector and place it in the opening.

    • 4). Test the speaker, then screw it in with the Torx screws. Repeat for the other door's speaker.

    Rear Deck Speakers

    • 1). Pull up on the front edge of the bottom rear seat cushion. Pull the cushion forward and remove it from the car.

    • 2). Remove two 3/4-inch nuts and two 14-mm bolts from below the edge of the upper rear seat cushion, using a 3/4-inch wrench and a 14-mm socket and ratchet handle. Pull the rear seat cushion upward and remove it from the car.

    • 3). Pry out the rear side panels and upper trim panels from behind the rear door on both sides of the car, using a panel tool.

    • 4). Pry out three round clips from the front edge of the rear deck panel. Pull the panel forward to expose the speakers.

    • 5). Remove four Phillips screws from the edge of each speaker with a Phillips screwdriver and pull the speakers out of the deck. Unplug the connectors on the back of each speaker. Plug the new speakers into the connectors and place them in the deck. Test the speakers, then screw them in with the Phillips screws.

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