After looking your unit's info up, I found it doesn't have a built-in aux input. This was an option (not surprising seeing as it's an old Walmart version of a nicer head unit by jvc). IF the previous owner chose to add the optional aux input, there will be a black wire coming from the back of the unit that's way thicker than the rest. Follow it and it should lead you to where the previous owner mounted the aux input Jack. If there is no wire, you're pretty much screwed, because the model has been discontinued and it'll be just about impossible to find the appropriate accessory. The good news in all of that is, for the price you'd pay for the aux input alone, you can find a decent NEW head unit WITH an aux jack for the same price or darn close. Best of luck!