Re: spoilers opens and remains open - it is a 2005
Could be a bad traction control relay in the relay control module.
Open the RCM (see video on YouTube), turn the key to the ON position.
2 of the 3 middle relays should remain closed (engaged).
If not, bad relay.
To verify - Manually close the relay, turn the key to the ON position and see if you can lower the wing.