1. Determine if Rear Speaker Wiring Exists:
* Check the trunk: Look for existing speaker wires in the trunk area. Some models might have pre-wiring even if they didn't come with rear speakers from the factory. If you find wires, this simplifies the process considerably. Trace these wires to see where they terminate. They *might* connect to a harness, which is ideal.
* Check the door sill panels and rear side panels: Sometimes, wiring is run along the car's body, even if it isn't connected to anything. Checking these areas could reveal pre-existing wiring.
2. If No Wiring Exists:
This is the more difficult scenario. You'll need to run new speaker wires from the head unit (radio) in the dash to the rear of the vehicle. This involves:
* Routing the wires: This is the most challenging part. You'll need to carefully run the wires under the carpet, along door sills, and potentially through existing grommets (rubber holes) to avoid damaging the interior. This requires patience and the right tools.
* Connecting to the head unit: You'll need to access the head unit and connect the new wires to the appropriate speaker output channels. This may involve tapping into the existing wiring or potentially replacing the head unit with one that supports rear speakers. If tapping, use wire connectors to avoid cutting into the factory wiring.
* Finding a power source (if needed): You might need to find a suitable 12V power source for the amplifier if you're using an aftermarket amplifier. Avoid tapping into circuits that are crucial for safety.
3. Selecting Speakers and Mounting Locations:
* Speaker size: Determine the size of speakers that will fit in the rear deck or other locations you've chosen. You'll need to either create custom mounting locations or find speakers that fit existing locations. 6x9" speakers are a common size in rear decks.
* Mounting: If no factory locations exist, you'll need to fabricate mounting brackets or find a suitable alternative mounting location (e.g., custom panels).
* Speaker choice: Choose speakers appropriate for your system and budget.
4. Installation:
* Run the wires (if necessary): Carefully route the wires, securing them with zip ties or wire loom to prevent rattles.
* Connect the speakers: Connect the speaker wires to the speakers and test the connections before fully installing the speakers.
* Mount the speakers: Securely mount the speakers in their chosen locations.
* Test the speakers: Once everything is installed, test the speakers to ensure they are working correctly.
Tools and Materials:
* Wire strippers/crimpers
* Wire connectors
* Speaker wire
* Mounting brackets (likely needed)
* Drill (potentially)
* Screwdrivers
* Zip ties or wire loom
* Multimeter (optional, but helpful for testing)
* Speakers
* Amplifier (if necessary)
Important Considerations:
* Factory Amplifier: The 2000 Grand Prix may have a factory amplifier. If so, you'll need to carefully consider how to integrate your rear speakers with it.
* Fading: Your head unit may not have a "fade" control to balance front and rear speakers; you might have to find a way to adjust this with an external equalizer if desired.
This is a significant project that requires some car audio experience and the right tools. If you're not comfortable with this type of work, it's best to take your car to a professional car audio installer. Improper wiring can lead to damaged components or even electrical issues.
