20 Most Recent Pioneer DEH-P3900MP CD Player Questions & Answers

a blown sound ic perhaps

hold the SRC button until the stereo turns off. Hold in on the function button (or volume knob) until the setup menu turns on... once it comes up, you can scroll thru selections with the volume knob and turn them on and off by clicking in on the knob. AUX2 will be one of those settings.

rca jacks are a low level output. you have to use an amplifier with rca's. you cannoy hook rca's directly to speakers.

Did you check all of the fuses in your fuse boxes? That radio requires two power sources in order to work.

red - 12v battery
yellow- 12 ignition
black- ground
blue/white- amp turn on
white FL+
white/black FL -
gray FR +
gray/black FR -
green RL +
green/black RL -
purple RR +
purple/black RR -

Upper right-hand corner, there's a button next to the "eject" button. Pressing this button while the unit is on will cycle between displaying the clock and the track number & play time (CD) or clock & radio station.
When the unit is off, you can press the same button to completely shut off the display, which is sometimes nice if you don't want the blue ring around the volume knob glaring in your face.

http://www.pioneerelectronics.com/pio/pe/images/portal/cit_11221/370942420DEHP3900MPInstallationManual1027.pdf

press menu and setting bottons and it should show up.