06 mark lt with avhp7480dvd sub outputs?

Ok i need some help with something that has been bothering me for about 4 days and i just can't figure it out? Ok well i have a 2006 Lincoln Mark LT With a pioneer AVH-97480DVD. I recently installed the radio/dvd player and everything was working good (as far as i knew) then when i put a cd in and the source switched to the cd player when the music came on it was really loud and the volume was down at 0? but the sound seemed like it was only coming from the factory sub under the rear seats? so i decided to turn the volume up and the sub continued to sound the same but the other speakers kicked in and it sounded fine? so i went ahead and disconnected the Right And Left audio wires from the aftermarket wire harness from the truck to the back of the unit and the sub went off, and the music sounded fine but there wasn't any bass. so i then connected just the (white audio not sure if left or right) and the sub kicked on again? then i connected the red and it did not seem to make a difference? i checked all the settings on the unit and turned everything down on the outputs but it did not make a difference when a cd would play, only with the radio as soon as you switch to cd or dvd the bass would be heavy.. when the speakers would be low? so i checked my wires and i noticed on the after market kit for the truck the wire that has the audio rca's coming off of it has two amp turn on wires? i only had on connected. but by that time i was really bothered from working on it for about 4 days so i didn't do anything with them. could it be that both amp turn-on's have to be connected or just one and i have the wrong one connected? i just don't understand how the amplifier would put out so much power when on a cd but not when the radio is on? any help would be appreciated. Thank You!

I do have a pop noise but only when i am switching from the radio to dvd/cd? The Sub works fine with the radio on and there is no pop noise when it turns on, just when switching from radio to cd/dvd. and the sub is only load when the cd/dvd is playing until i disconnect the rca cable(s).. I checked the settings on the radio and turned all the sub and output options down, but it still does the same thing? its just weird to me because it is fine with the radio only loud with the dvd/cd making me think something is hooked up wrong? thanks for the help let me know what else you got or if thats it..

The sub amp will only provide volume from the signal it gets from the RCA plug. If you have too much volume from the sub it means it is getting too much signal, no question. I've done dozens of LT's and F series with the factory sub, a simple connection. I've done AVIC's, Eclipse, Kenwood, even Advent with no issues as you describe. Gotta be a problem from the head unit signal...Mike M2

Tech Manager

CS Dealer Services

Since it is a Pioneer Deck. At least perform the test at the top of the following link. Let us know what you find out.

Ok Thank You, Ill do that test and see what else i can find out and get back later and let you know what happens thanks for the help! and it is weird because i use to have the unit in a 97 f350 with aftermarket subs and amp and had the bump noise but the volume controls with the cd/dvd sounded just like the radio with nothing different i guess i might end up having to bypass the amplifier or something? not sure but ill let you know what i figure out and again thanks for the help. let me know if anything comes up i will try this tomorrow morning.

Ok, I did the test at the top of that link that i was sent and the reading on my ohm meter jumped from 0.12 to -0.63 and so fourth it jumped around alot.. anyway i tried a couple different things and i don't know what to do next? any ideas? or should i continue on and do what that page says to repair the ground? let me know thanks!

Your ground is fine.  No need to proceed.

I have no idea what else to do? it just seems weird that it sounds fine when the radio is on but loud with the cd playing.. i might just have to bypass the amp i am not sure what else to do or check? if you have any ideas let me know.. Thanks

The fact that it is fine with radio alone shows you the issue is with your unit as the truck has no way of knowing what signal you are sending. Try contacting Pioneer....Mike M2

Tech Manager

CS Dealer Services