[RedThunder94]

dunno if there is a huge difference between the 03 and the 99's but if it is pretty much the same it will not mess with the cars computer by a long shot, the only thing that is hard to get is the install kits, they had to order mine at the local audio shop but it was here in a few days along with the antenna adapter (very pricey BTW), but they did have the wiring harness in stock. i had no prob hooking it all up although if you need new speakers be ready to have to drill out the rivets on the old ones, they use rivets instead of screws to hold them in, but all in all i say it was a pretty straightforward install.

 

[RedThunder94]

Not true. The "K-line" in the back of the radio, if hooked up to +12V, can do weird things to the ECU. Unfortunately, a lot of wiring harness makers make the harness in this damaging way.

To the OP: Try searching for K-line here on the org (or aftermarket stereo... the search engine may not like the phrase "k-line"). There is a way to hook up a new stereo that won't harm the ECU. I *think* all you do is leave the K-line disconnected, but I could be wrong.

okay but still as long as he gets the correct harness it will not mess up the computer, right? if people just start cutting wires and do a hack job yes something bad can happen, my harness wasn't a K-line whatever and my car hasn't blown up lol. its on its second stereo. the first one i sold to trade up so i can use my 12 disc. and i do have more than just a better headunit, i actually wired a whole system from tweets to speakers to amps and subs, so i'm not just a stereo swapper. get a harness from a reputable place and hook it up.