Will an 02 Chevy Trailblazer stereo plug into a 99 Cavalier?

[cdubcols]

Have a 99 cavalier. Needs a new stereo. Found one out of an 02-04 chevy trailblazer. I'm sure its the same size, but are the plugs the same?

[KaeZoo]

Actually, the size and plugs are completely different, and the two radios work differently as well.

The 99 Cavalier uses the old-style Chevrolet DIN+1/2 radio, activated by an accessory power wire in the radio harness.

The Trailblazer uses the newer double-DIN radio, activated by data commands through the Class-II data bus system (which the Cavalier lacks).

If you had a 2000+ Cavalier, the radio sizes and plugs would match; however, you'd need to have the built-in radio anti-theft system reset by a GM dealer before it would work.

For your '99 Cavalier, you can look for a radio from a 95+ Chevy Lumina, a 98-02 Chevy S-10 pickup or Blazer (or GMC S-15 or Jimmy), or a 95-99 Monte Carlo. Those should be plug-and-play (though you still may run into problems with the Theftlock system).