I recently just redid the entire audio setup in my vehicle, and it took me a few searches here and there to get the proper information needed, so I figure I throw everything together to help those in the future.
This is for those of you who are planning to upgrade your factory deck and amp. For those hoping to get an aftermarket 4-channel amplifier to power some aftermarket speakers, the information here should help you out a lot.
I would recommend removing the passenger seat. It's 4 14mm bolts on each corner. Pry out the bolt covers with a flathead or just carefully popping them out by hand.
You should see the Inifinity factory amp. Unplug the wiring harness from the amp and the 6-pin din cable. If you are upgrading the deck along with the amp you can then proceed to remove the 6-pin din cable and factory amp. The factory amp is secured by 2 screws. Use a phillips screwdriver to remove them.
Now the part that seems to be confusing a lot of people. Unless you are going to track down all the wiring in the car and removing them and wire up all new speaker connectors; this wiring harness is the heart and soul of it all. You could also go from the wiring harness behind the deck, but as most of you know it is only for the door/rear speakers, the tweeter connectors are from the wiring harness under the seat. Not to mention you will find it is easier to route the wires going to the amp from here. Also if you are going to run component speakers with the external passive crossovers.
Below is the factory wiring harness wiring colors (Thanks to Attack Eagle):
Left Front Tweeter
+ yellow/blue
- gray/blue
Left Front
+ white/blue
- black/blue
Left Rear
+ yellow/blue
- gray/blue
-------------------------
Right Front Tweeter
+ yellow/red
- gray/red
Right Front
+ white/red
- black/red
Right Rear
+ yellow/red
- gray/red
**NOTE: THE TWEETERS AND REAR SPEAKERS OF THE SAME SIDE HAVE THE SAME COLORS. Use the 9v popping the speaker technique to tell which is which. I actually just hooked up the speaker to the deck to test it out. Make sure its on very low volume. Take a look at the picture below, for reference. It is PRIOR to installing a component set with tweeters.
The picture above should give you an idea of where all the speaker leads are. This is with NO tweeters connected. Your standard coaxial speakers. As reference you can see all the connections are on the right of the wiring harness.
The picture above is with a component set installed and tweeters installed. The tweeter connections were on the left side of the wiring harness.
Below is the wiring diagram from the service manual. This might help some of you if the above hasn't already.
For a fullsize version:
http://s88280493.onlinehome.us/temp/dsm/FactoryAmpDiagram.jpg
So if your going to run an aftermarket deck and an aftermarket 4-channel amp just tap the wires from the wiring harness under the passenger seat to the amp. Use the pair of RCA preouts from the deck to the amp. It is definitely worth it. Aftermarket decks still don't have enough power to give to speakers. Also upgrade those stock tweeters, they are trash. Here is the guide to fit the standard 1" tweeters that come with component sets in the oem basket:
http://www.dsmtalk.com/forums/showthread.php?t=107448
This is for those of you who are planning to upgrade your factory deck and amp. For those hoping to get an aftermarket 4-channel amplifier to power some aftermarket speakers, the information here should help you out a lot.
I would recommend removing the passenger seat. It's 4 14mm bolts on each corner. Pry out the bolt covers with a flathead or just carefully popping them out by hand.
You should see the Inifinity factory amp. Unplug the wiring harness from the amp and the 6-pin din cable. If you are upgrading the deck along with the amp you can then proceed to remove the 6-pin din cable and factory amp. The factory amp is secured by 2 screws. Use a phillips screwdriver to remove them.
Now the part that seems to be confusing a lot of people. Unless you are going to track down all the wiring in the car and removing them and wire up all new speaker connectors; this wiring harness is the heart and soul of it all. You could also go from the wiring harness behind the deck, but as most of you know it is only for the door/rear speakers, the tweeter connectors are from the wiring harness under the seat. Not to mention you will find it is easier to route the wires going to the amp from here. Also if you are going to run component speakers with the external passive crossovers.
Below is the factory wiring harness wiring colors (Thanks to Attack Eagle):
Left Front Tweeter
+ yellow/blue
- gray/blue
Left Front
+ white/blue
- black/blue
Left Rear
+ yellow/blue
- gray/blue
-------------------------
Right Front Tweeter
+ yellow/red
- gray/red
Right Front
+ white/red
- black/red
Right Rear
+ yellow/red
- gray/red
**NOTE: THE TWEETERS AND REAR SPEAKERS OF THE SAME SIDE HAVE THE SAME COLORS. Use the 9v popping the speaker technique to tell which is which. I actually just hooked up the speaker to the deck to test it out. Make sure its on very low volume. Take a look at the picture below, for reference. It is PRIOR to installing a component set with tweeters.

The picture above should give you an idea of where all the speaker leads are. This is with NO tweeters connected. Your standard coaxial speakers. As reference you can see all the connections are on the right of the wiring harness.

The picture above is with a component set installed and tweeters installed. The tweeter connections were on the left side of the wiring harness.
Below is the wiring diagram from the service manual. This might help some of you if the above hasn't already.

For a fullsize version:
http://s88280493.onlinehome.us/temp/dsm/FactoryAmpDiagram.jpg
So if your going to run an aftermarket deck and an aftermarket 4-channel amp just tap the wires from the wiring harness under the passenger seat to the amp. Use the pair of RCA preouts from the deck to the amp. It is definitely worth it. Aftermarket decks still don't have enough power to give to speakers. Also upgrade those stock tweeters, they are trash. Here is the guide to fit the standard 1" tweeters that come with component sets in the oem basket:
http://www.dsmtalk.com/forums/showthread.php?t=107448