Tip. Try to release the passenger third row seat assembly by pushing on the seat back from. the front and back while pulling on the release handle (1). Along with jiggling the release handle, my problem is not in the cable, it is just in the seatback release handle assembly....y name is XXXXX XXXXX I will do my best to help you with your Chevy problem. There is a bulletin on the third row seat operation. If the seat is not fully latching into position, it will not fully release the locking mechanism.