Hi guys, so I was getting ready to try and install a sub in my 2014 Impala 2LT Non Bose, and the adapter I bought is supposed to connect to the green plug on my radio module under the glove box and provide a pass thru. Well as it turns out there is no green plug plugged into the radio module. Is this supposed to be like this or is this some weird quirk because the car is Canadian???? Any advice would be helpful including tips on installing a sub and what adapter I could use if there is one. Thanks!