I have a 2006 Pontiac Appliance. Is there any way to add an aux input to the stock radio even without there being an aux button on the face? It's a single disc (MP3?) non-Monsoon unit. I tried looking at Cruthfield's website, but, it keeps erroring out. I also didn't find any upgraded factory HU's on eBay in the off chance that they might have the aux jack.
I'd really rather keep the factory HU as opposed to buying some sort of aftermarket unit.