You press the key fob outside the grocery store and hear nothing. The driver's door stays locked, the remote light flashes, and the temptation is immediate: grab a screwdriver and remove the door panel. That's usually the wrong first move. Car door lock repair starts with diagnosis, not disassembly. A dead lock may involve the electrical circuit, the latch and linkage, or the key and remote system. In Minnesota, cold weather adds another layer because frozen cylinders, stiff grease, corrosion, and door alignment problems can imitate an electrical failure. Identify