I have connected the power and other wires correctly and my pioneer radio will not turn on.

You will need to connect the pioneer unit to a switched ignition wire from the ignition switch. The 2006 GM factory radio only has a constant B+ (orange wire) and ground (black wire). The factory radio turns on when the Body Control Module (BCM) sends the radio a turn-on signal (on a data communication line) when the key is turned on. Your pioneer unit won't talk to the truck's BCM, and will need you to wire a switched B+ feed to it that turns on in the ignition accessory and run positions.

Make sure that the speaker wiring is correctly connected. Please see the instruction manual that would have come with the Pioneer deck for correct wiring instructions first. Check that first and let me know..

Apparently, you have no power at the 12 volt battery/memory wire at the radio harness of the vehicle. This wire is white with blue in color.
Also, based upon your description, you have connected the battery/memory wire and the accessory wire of the radio to the 12 volt accessory (switched) wire of the vehicle. This wire is white with red in color.
Check the radio/ stereo fuse of the car. You may have blown the fuse during your installation.
You have no memory at the radio because when you turn off the key, you lose all power to the radio.
Also, I mentioned the wire colors just in case you used an aftermarket radio wiring harness. Make sure that the yellow from the Pioneer unit is going to the battery power source and, the red of the Pioneer is going to the switched power source.

If you are looking to connect this radio at home, you will first need some kind of 12V DC power supply with an operating range anywhere between 9-16V. You can purchase these online or at most electronics retailers (Radio Shack, Fry's Electronics, etc.). Simply connect the constant memory power wire (yellow) and switched accessory power wire (red) from the Pioneer's wiring harness to the "+" terminal on the power supply and the ground (black) wire of the Pioneer to the "-" terminal on the power supply. Make sure to have at least one speaker connected to the speaker output leads of the Pioneer for sound. The speaker connections are as follows: Front Left + (white) FL - (white/black stripe), F Right + (gray) FR - (gray/black), Rear L + (green) RL - (green/black) RR + (violet) RR - (violet/black). And that's it! Sound at home with your Pioneer radio!
I hope this information was helpful.

The constant power wire either wasn't connected, has come loose, or was connected incorrectly - as in connected to ignition instead of battery power. Check your red and yellow wires to insure they're connected correctly.

You must connect the constant hot wire (or there is a fuse blown somewhere).... it should either be orange or yellow at the rear of the pioneer radio ... it should be connected to a wire that recieves power even when the key is off ... that wire will depend on the car itself ... if you used a connector to plug into the factory wires (a good idea) that connecter should have a yellow wire that would supply a constant "hot" for your pioneer, if it doesn't there should be a fuse blown in the car fuse box.

did you check to make sure your vehicle didnt come with a factory amp, if it has one is it turning on? or did you remember to disconnect the negative battery cable while installing your radio, i know thats a dumb question, once i was installing a pioneer a barely crossed a couple wires and fried the radio, the radio itself worked fine and all the features etc, but it never did play sound again. i always disconnect the power now!!

ok first the large red is battery connection, black large is ground find good source to ground, the 0.75 is most likely the power on for the amp you should hook it up to the power antenna wire on the radio. this will turn on the amp when the radio is turned on. the grey green and black are prob speaker hook ups input. the four wires are speaker outs, the red wire might be power for cd changer test it to see if it puts out power when amp is on.

This may have a different type of triggered turn on wire. On some of the older Pioneer amps (and maybe some new ones) the trigger wire would SUPPLY B+ TO THE RADIO and when the radio was switched on the amp would sense a current draw on that wire and would then switch on. Unlike most common amps which sense the presence of B+ on the trigger wire supplied by the radio and then turn on. Look in your owners manual to see kind of turn on system you have. If you don't have an owners manual then perhaps you can download one from Pioneer support. good luck

The wire that runs along with the P-bus cable connects to constant power; the other wire needs to be grounded.