Locked my keys in the trunk of my 90 Cadillac DeVille
Locked my only key in the trunk of my 90 Cadillac DeVille
can I go through the backseat if so is it hard to get into
Drill out the lock.
Get an auto locksmith, you can't get though the back seat
Your best bet is a locksmith. If you have time on this, Cadillac can research this for you and get the original key codes for you. But if the lock has been changed over the years the original code won't work. They'll send the original codes to your local Cadillac dealer and you'll have to go there in person with the vehicle registration and your driver's license as proof of ownership to get the key codes. Contact Cadillac Customer Service at 1-(800)-333-4223 or Cadillac Roadside Assistance at 1-(800)-224-1400. For roadside assistance Cadillac will send someone out but since your DeVille is out of warranty there is a charge. Doesn't matter how old the car is, as long as it says Cadillac on it, roadside assistance is available. HTH. - Jim
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