Ive had my 03 g35 sedan for two years now and have noticed that the sub in the back dash isny working. It has an after market cd player in it(was in car when i got it) is there a chance that it just was not hooked up or do most aftermarket cd players not support the sub? Is there anything else i can check? I will have to order the tools to remove cd player sense previous owner wasnt nice enough to put tools in the car when selling