Either you got the wrong key or the key tumbler is bad. It is not going to be easy to solve the problem as the tumbler cylinder is removable only with key in ACC position.
Another possible reason is a stuck interlock switch at the key cylinder.
You might need the services of a locksmith.
If you have the alarm system in order, try disconnecting the battery and retest. It would only be applicable if the interlock is at fault.
Wednesday, October 22nd, 2008 AT 3:46 PM