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how is the signal going from headunit to the power pack? Should have a harness from the power pack to the deck (h/u). then out to the factory harness in the jeep. remember there is an amp under rear seat so you need to bypass that to make everything work. yes the blue/white wire from deck to blue/white wire ath the power pack (amp) should be connected in order for the power pack to turn on.
try changing the headlight switch,I had a similar problem only mine happened after I accidentaly short out when I was replacing the horn pad and for some reason when I replaced the headlight switch the problem went away.
I am not 100% sure.... but usually the blue wire is a trigger. It is usually used by the deck to turn on amps or power antenna. I would consult an expert, but it may be that your main deck has to trigger the DVD to make it work...... but if I am wrong, grounding this wire WILL FRY your deck, so make sure you do check, what you can do is use a volt/ohm meter and check for voltage coming out of the blue wire when the DVD is lit up, if it is a trigger out it will have a voltage reading of 3-6V IIRC, if it has no power at all, it is PROBABLY a trigger in, in other words 3-6V into it, would probably make the deck work.... if it is a trigger in that is......
Does the new deck have a blue wire for remote and a blue/white wire also? The blue one is for a power antenna and shuts of when playing discs or axillary inputs. The blue/white is for power amplifiers and stays on when the deck is on. Also be sure the remote wire that goes to the amp is not pinched and grounded out to the frame of the car.
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First of all, if you connect iginition and constant to the same wire, it sometimes will not work, make sure they are hooked up to dedicated wires in the car. Also once they are connected and the car is on, press the source (src) button or am/fm button. Check the fuse on the back of the stereo by the wire harness too. Also make sure yellow is on constant and red is on ignition.