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What to add factory subwoofer to trunk.

stang1971

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ok...question.... i have a premium 18 that i have put a aftermarket sup and amp in... it sounds fine but would i be better off getting my signal from this plug to prevent any roll off thats happening since im tied into the rear speakers?
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Robertp

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From what I am told yes but u will need the shaker amp like I posted above for that to work
 

BrianH87

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Although I don't have a premium, I do have a 301a with the 9 speaker. I'll need to check to see if I have the wiring. Anyone know the answer?
 

Robertp

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It’s very possible pull the carpet back on the passenger rear in the trunk of the wiring is there, it’s a 40 pin connecter behind the metal support, if so its wired
 

Cobra Jet

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Ok so now we need to confirm the following:

1) Is that harness included only in 2018 Premium GT’s
2) Is that harness included with a certain option package
3) Is that harness included after a certain build date

Here’s why:
I just checked my 2018 Premium EB w/Performance Package w/ Equipment Group 200A; that (40) pin connector is NOT in my trunk on the right side (passenger side). I pulled the trunk liner all the way out, felt around the back side of the wheel well past the other mounted modules and it’s definltey not there.

My build date is Jan 9, 2018.
 

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Robertp

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Take a picture below the connecter with 2 plugs, mine was built in January as well
 

Cobra Jet

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Take a picture below the connecter with 2 plugs, mine was built in January as well
Robert,

Can you take a pic of yours to show exactly where you located the connector?

Also, what Equipment Group is your 2018 equipped with?
 

Robertp

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Yes I will tomorrow
I’ll take a pic of the 40 pin connecter tomorrow
I finally got my sub and bracket in today and my other dsp module came Monday so we are a go
 

Robertp

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ill say this for the hater that said it wouldant work, u are a idiot

Up and running
 

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Robertp

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See the connecter with the blue the vehicle aready has that 40 pin connecter I just bought the 7 dollar harness that went from that to the sub
90C8294C-5D8C-4721-870B-4DD4960869D0.jpeg
 

BrianH87

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So this did work? Awesome! Did you need to make any changes in Forscan or anything like that? Just the front DSP, rear harness, and sub?
 
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BrianH87

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Ok, so I can confirm that I do indeed have the extra harness in my car. 18 GT (non-premium) with 301A.
 

Robertp

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No changes to forscan at all, do u have the regular premium 9 speaker stereo? If so pull the carpet back verify u have the 40 pin connecter with the blue on it if so u should be a go all I changed was the front dsp module the 7 dollar harness from 40 pin to 9 pin amp wire added bracket cut the carpet and bolted it all in tomorrow I’ll take pics of all the hardware needed with part numbers as well
 

BrianH87

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Cool, thanks a bunch for all your work on this! I do indeed have the extra sub harness in the trunk.

The only thing confusing is there are a bunch of different part numbers for shaker amps. There is FR3T-18T806-CP, FR3T-18T806-BS, FR3T-18T806-CN, etc... The first set of numbers are all the same, but the last two letters are different. They all claim to be shaker amps. ??? I'll just get the same one as you. We know that one works.
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