Re: 2015 Malibu 1LT Needs help wiring in Amp!
The module under the rear deck is for OnStar. You will need to pull output from the rear door speakers at the doors themselves or the B pillar. I went into the door & ran back since Im not using the rear door speakers. They are for fill & get lost with the added bass. Theres guys on here that use he trunk battery location but upgrade it & do the Big 3. I used the 12v outlet under the cd player for amp trigger. Theres LOCs that are sound triggered also.
With the way my 13 is sealed the Skar 8” & Fosgate Prime 500.1 is more than enuff with the seats down. I went a step futher few years ago & opened the pass through hole up incase I have passengers.