Aftermarket Keyless Entry Fuse Blows When Stereo Connected

I'm having a similar issue with my 2001 Toyota Tacoma. The fuse to the keyless entry module blew when I first tested the system. After disconnecting the parking lights (brown wires) and replacing the blown fuse, the keyless entry and everything else works great- except for the pyle aftermarket head unit. I'm worried I blew the unit itself. Another possibility is that I set up the keyless entry in accordance to the wrong trigger. I set it up for a negative trigger system, while it could be a positive. Might this cause a short in the system? The only difference between the + and - trigger setup is the placement of a yellow and a yellow/black wire (ground for a negative, constant 12v for positive). I grounded the wires where there was an existing ground wire, so my thinking is that this may be the ground for the stereo and I'm running a 12v current into it. It's either the setup, the head unit is blown, or some other issue unbenounced to me. No other fuses appear to be blown, unless the head unit has its own hidden fuse somewhere. The only directly applicable information I can seem to find anywhere on the internet is in this one forum thread. Please help!

Update: Problem solved! There's something called an on button- who woulda thought! Anyway, the head unit used to come on automatically when I started the car, but after installing the keyless entry, I have to turn it on manually every time. I thought it wasn't working altogether, but just wasn't used to seeing a black screen when I start the car. Plus, the on button is about the size of a pinhead! You live and you learn.

Maybe it's turning off every time because it shorts momentarily when I hit the unlock button each time to get in (due to wiring for incorrect trigger). Would that make sense? I'm just a high school kid working on his truck, so no expert opinions here.