I have a pioneer deh p4200ub deck and when i plug my iphone with usb cable it gives me error 19 it was fine one day then that night i updated the iphone and it gave me error 19

SOURCE: I keep getting ERROR 19 when I try hooking up my

Did you recently update your iPhone 3GS firmware to iOS 4.x ? There is a signficant number of people with this problem after the firmware update. Here are two possible solutions that have worked for some people.

1) Turn off your iPhone (hold the power switch down,then swipie off). Turn the deck on to your USB1 or USB2 (whatever you are using). Now plug the iPhone into the deck. This should turn the iPhone on, and "reset" the connection to the USB.

2) Turn the deck on and switch to the proper USB source. Connect the iPhone to the deck, then initiate a "hard reset" of the iPhone (hold the power

SOURCE: Wiring Diagram Pioneer DEH 45x4

Well first you will have to get the fit kit for your car to prevent the radio from being stolen, and make it fit right. you can get this part at Best Buy, Circut City, or even sometimes at walmart. also you will need to get the proper wiring harness. all you have to do is go to an audio place and ask them for the proper parts for your car and they will get them for you. After you have everything that they say you need all of the wires match up colors. extra wires you will have is the remote wire witch is blue w/white stripe. and an orange one (illumines) witch if isnt on the wiring harness for your car its fine. all the ill. wire does is dim the radio when you dim your other componets in your car.

SOURCE: deh-p6000ub usb mass storage device issues

Pioneer head units (decks) have a function wherein u can opt for AUX -ON / OFF.Similarly USB -ON /OFF.Why is this function given,i dont know.
To choose AUX "ON" or USB "ON" put the power OFF from the SRC SWITCH,PRESS THE MULTICONTROL ROTARY KNOB for 1-2 seconds .the display will show AUX OFF or USB OFF.Select "ON"on pressing the multicontrol knob again.
Now connect your device via the AUX or USB jack and see
i hope your problem is solved.

SOURCE: wire colours for my pioneer deh 2300

here are the wiring for the deck and the car:
Deck:
12v - red
ignition: yellow
blk - ground
orange - dimmer
white - frt left +
white /blk - frt left -
gray - frt right +
gray /blk - frt right -
green - left rear +
green /blk - left rear _
Purple - right rear +
Purple w/blk right rear -
Car:
2002 Oldsmobile Alero Car Radio Stereo Audio Wiring Diagram
Car Radio Constant 12v+ Wire: Orange
Car Radio Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: Brown
Car Stereo Dimmer Wire: Gray
Car Stereo Antenna Trigger: Dark Green
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue
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SOURCE: how do i adjust the clock on a deh 1900 mp audio

ive had a search for you and found the manual to download for your pioneer,

hope it helps you set the clock

http://www.retrevo.com/support/Pioneer-DEH-1900mp-Car-Receivers-manual/id/23227bh432/t/2/