pkg4,need to start to program?

 NOW I UNDERSTAND!

Try this:

Put a battery charger on the vehicle's battery then procede with the following.

1) If the key is on a key chain, remove it so that it's by itself in the ignition barrel. Turn key to IGN position.

2) Attempt to start, if it fails, leave ign key ON - do not turn key OFF.

3) Wait 10 minutes til security light turns off in instrument panel.

4) Turn key OFF. Wait 5 seconds.

5) Repeat steps 2 to 4 up to three times.

6) When you have done step 4 at the third attempt, start the car.

That key should start the car.

In the future, if you have a SpeedPass or other transponder key on your keychain, remove them. Transponder keys should be alone or with non-transponder keys.

If you still have problems in the future, then follow JWorms suggestion:

if you changed passkey modual and key the car won't start, they need to reprogrammed in, start with all orginal stuff.

Did you check the 10 amp fuse that powers the system?