When a car seat doesn't tilt forward, it is most likely an issue with the locking mechanism. Motorized car seats utilize a series of cables and levers to switch between tilting and upright positions. It's possible that one or more of these parts has come loose or become damaged, preventing the seat from reclining. You can try to solve this problem yourself by examining the underside of the seat for any loose pieces, or you can take it to a mechanic to have them check for any larger issues.