I just bought an 03 mcss and the doors will not unlock with the key fob. They will lock with the key fob and the doors will lock and unlock when using the door switches. When I hit the unlock button on the key fob there is a click sound under the dash but the door locks won't move. Any ideas?

 

Both FOBs are that way?

 

Yeah, the doors will not unlock with either FOB. When you press the unlock button the interior lights will come on but the doors won't unlock.

 

Maybe a lock solenoid...