Had to do some maintenance on my Pioneer head unit today unfortunately. Took the time to do a quick write up since I could not find one on this site. Tried to be as specific as possible, any questions just PM me. Sorry for crappy pics, left camera at the girls place.
Start off by disconnecting both HVAC cables under the driver side and passenger side of the dash. If you back feels likes it going to break when removing HVAC cables your doing it right. This must be done so the HVAC bezel can be pulled far enough out of the way to access radio bracket screws.
Driver side cable end.
Passenger side cable end.
Once the HVAC cables are disconnected proceed to unscrew the shift knob.
Use your fingers to gently pull up rear of shift trim to release rear most clips
Pull front section of shift trim down, out, and up to free front most clips.
Disconnect the cigarette lighter/power outlet. Place shift knob trim somewhere safe!
Don't be a fool, wrap your shift knob threads to prevent gnawing up your HVAC bezel
Remove 2 screws on bottom of HVAC bezel
Use your fingers to gently pry and release lower HVAC bezel clips
Stop when you get the bottom clips released.
Find a plastic dash component friendly pry tool.
Gently, Gently working from bottom to top use a twisting motion with pry tool to release upper stubborn HVAC bezel clips. Do not force them. Sometimes pulling the bezel downward will help release clips. Please be careful not to break.
Release the clip for the hazard switch wiring. Pull bezel back and out of way, you do not need to remove whole bezel. Just move it out of way to access screws for radio bracket. Don't bother with the fan speed wire clips.
With the HVAC bezel pulled forward and out of the way remove 2 upper radio bracket screws.
...and 2 lower screws.
Pull unit out and up. Be careful! The 4 screw tabs stick out and just want to leave scratches on your dash if handled carelessly! Hold the unit and take the time to disconnect all wiring to the head unit. Then place unit on front seat or where every you want to bring it.
To remove head unit from brackets just remove the 2 machine thread screws on each side.
And just do the opposite of what you did to remove to reinstall.
As for wiring, if your installing a new head unit to replace factory, remember to Solder and use Heat Shrink Tubing if connecting the harness yourself.