I would like to refer you to a reputable car audio dealer.
If you have NOT yet CUT THE FACTORY HARNESS, DON'T!!!!!!! Airbags are nothing to take lightly...
I HIGHLY RECOMMEND a wiring harness adapter from a reputable source such as METRA, Scoche, or Pozitive Connections. Every wiring harness adapter changes the colors at the "pioneer side" of the harness to color match the PIONEER RADIO. All you have to do is color match, plug and play.
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If your radio will not hold memory then you are lacking a constant 12 volt power source. Check the yellow and red wires at the radio. The yellow wire should be connected to a constant 12 volt power source (battery) and the red wire should be connected to a switch 12 volt power source (accessory or ignition).
With the appropriate wiring and bracket adapters, it will almost certainly fit. These are available at most electronics stores like best buy as well as auto parts stores and wal-mart. Metra is one of the leading brands. You might also check ebay, jcwhitney.com or summitracing.com.
There are no subwoofer settings on the Pioneer DEH-2800MP.
You need to check the external power amplifier and the connections from the Pioneer and from the sub(s). If everything is plugged in and wired correctly, check the amp fuses, both on-board and the main power fuse (located in the amp positive lead usually near the vehicle battery).
If you have a blue with white on it or a solid blue lead, I'm at a loss, however the manual even states that colors may change w/o notice. Best way to tell is to use a meter, black probe to ground and red probe to the orange. Put it on DC voltage then turn the ignition to acc. then turn on the deck, my hunch is that it's your amp remote turn on wire for an external amp or it can be used for a power antenna. Voltage should be 12.2-13.8dcv. Hope this helps
Purchase the aftermarket wire harness at from a local installation shop. WIres will match color for color to this harness then mate to the factory connector. This could save hours attempting to figure out the factory wire harness.