2002 Cavalier Head Unit

That car has a data bus 2 system. That means that to do the job properly you need to buy a factory relocation harness which lets you run the nessasary wires to the back of the car and leave the factory deck hooked up in the trunk, while the new deck runs the stereo in the dash. You can get  a module that can be used instead of the factory deck but its cheaper to use the deck. The reason why you do this is that when you remove a component from the data bus 2 system, like the factory deck, you can send the computer into disarea. The check engine light could and probally will come on and the air bag system could not arm. Those are both very bad things. Thats why the factory deck should be hooked up in the trunk. Its not a very fun car to do.double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

it's the lesser of two evils.... buy the Metra GMRC-01 and be done with it or use the relocation harness  and door chime speaker and relocate the factory radio.... if you are paying a shop to do it it will cost about the same since the extra labour to relocate the radio ( including the T harness and the chime speaker ) is about the difference in price from just buying the data interfaceKevin Gerry

Certified Electronics Technician

MECP First Class Installer

Owner/Installer

Classic Car Audio

since 1979