Took Stock amp and sub out help now

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2003 MSP
OKay well i figure this is a msp/mp3 specific question to anyone who has taken that board thing out under the rear deck in the trunk. Okay well there was this little black box thing with 2 nuts holding it in place in the stock amp rack. Well i had to cut the 2 wires going into it to get it off. Anyway my question is i think this is the controller for the raer window defroster. So where should i relocate it to? Anyone else who has done this please explain. THANKS
 
no, It's for the defroster. the bracket for the black box needs to be grounded. Remember that ground wire bolted under the bracket. I mounted mine with the two bolts on the left shock tower that was holding the sub bracket. These two bolts also hold the striker for the driver side seat back. I had to cut the wires to. Just soldered em back together.
 
I have to disagree for my car at least. If the box says "Naldec" on it, which mine did, it's the keyless entry. Search for "Naldec" on here and you'll see a thread that even mentions the location:

Did anybody else notice the strange spot that the factory keyless entry module is located? If you have a sedan, it is under the rear deck plastic piece. When I was changing my speakers a while back, I noticed it there. It is a little box that says Naldec on it.

I wonder where Mazda put this keyless entry module in the P5?

And a search on google.com brings me to this page which has:
Naldec engineers and manufactures advanced electronic body and safety vehicle modules. Acquisition of the corporation allows Visteon to establish a manufacturing and technical base in Japan that will be leveraged throughout the Asia Pacific Region.Visteon purchased 100 percent of Naldec from Mazda Motor Corporation for an undisclosed sum. Currently, the majority of Naldec's sales are to Mazda. Naldec's manufacturing plant in Hiroshima produces approximately 4 million air bag, antilock brake, keyless entry, speed control and other electrical modules annually. The corporation employs approximately 220 people, including about 70 engineers.

I guess the real test could be just having him go try his keyless entry. :D But yeah, the box under the rear deck was the entry system for my car. Dunno if they changed that between models or what..
 
Here's some pics. Not the greatest, but hope they will help.
 

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