I am swichin my factory radio out with a new radio and i was told that i could not use a regular wire harness.
you will need to check with an aftermarket radio dealer for the right harness. Almost all after market radios need a special type of harness to connect to the factory one, it is no big deal just plug and play. The big issue with your impala is that alot of the headlight functions as well as other functions are controlled and changed through the radio. Things such a key fob programming, oil life resetting, tire pressure monitoring resetting, how the horn honks when you lock and unlock the car and so on. This requires a special harness and to find that check with a reputable aftermarket car stereo place. The thing to think about is that if you ever want to adjust those settings that need to be done through the radio you will need to put the factory radio back in.
best buy sells aftermarket wiring harnesses that use the factory plug. 20 dollars i needed one for my astrovan it worked like a charm
