Q: How to replace the speakers on Pontiac Fiero?
A: All radios in this vehicle are the bridge audio type, using two wires to each speaker. It is very important when changing speakers or performing any radio work to avoid pinching any wires, as this will cause damage to the output circuit in the radio. For speaker replacement, begin with the sail panel by disconnecting the upper shoulder belt anchor assembly, removing the screw fastening the forward edge of the quarter trim panel to the body, and popping off the panel by unseating the retainer clip at the top. Slide the seat belt webbing through the slot on the panel and remove it. Next, remove the three speaker mounting screws, pull the speaker away from the body, disconnect the electrical connector, and remove the speaker. Plug in the electrical connector to the new speaker, install it, and tighten the mounting screws. Route the shoulder belt webbing through the slot in the quarter trim panel, reinstall the panel, push the retainer back into its slot, and tighten the mounting screw. Finally, install and tighten the upper shoulder belt anchor assembly. If equipped with a sub-woofer assembly, disconnect the wiring connector, remove the courtesy light bulb near the instrument panel support bracket if applicable, and take out the instrument panel support bracket bolt and convenience center mounting bracket bolt. Pull the instrument panel slightly toward the rear if necessary, slide the sub-woofer assembly to the left, and pull it straight down to remove it, with installation being the reverse of removal. For the front speaker, remove the grille by popping it loose from its rubber mounting grommets, take out the four speaker mounting screws, lift the speaker enough to disconnect the electrical connector from its underside, and remove the speaker, with installation being the reverse of removal.