Automotive Locksmithing Flashcards

What is a transponder key?

Answer: A key with an embedded microchip that communicates with the vehicle's immobilizer system

Transponder keys contain a microchip that sends a unique code to the car's immobilizer. Without the correct code, the engine will not start even if the key turns.

What is an immobilizer system in modern vehicles?

Answer: An electronic security system that prevents the engine from starting without the correct transponder signal

The immobilizer verifies the transponder key's electronic code before allowing the engine to start, preventing hot-wiring and unauthorized key use.

What is a key fob programmer used for?

Answer: Programming electronic key fobs and remotes to communicate with a vehicle's security system

A key fob programmer syncs new or replacement key fobs with the vehicle's electronic system, enabling remote lock/unlock and, in many cases, push-button start.

What tool do locksmiths use to decode a car's lock when no key is available?

Answer: A Lishi pick and decoder — a specialized tool that can both pick and decode the lock simultaneously

Lishi tools are designed for specific lock types and allow locksmiths to both pick the lock open and read the internal pin positions to cut a new key.

What is VAT (Vehicle Anti-Theft) system?

Answer: A security system that reads a resistor chip in the key to verify it matches the vehicle's expected resistance value

VAT systems (used in older GM vehicles) read the electrical resistance of a chip embedded in the key blade. If the resistance does not match, the system disables the starter.

Why must a locksmith be careful when programming new keys for modern vehicles?

Answer: Incorrect programming can disable existing keys or lock out the vehicle's entire system

Modern vehicle security systems can be sensitive to programming procedures. Mistakes may erase existing key codes, requiring expensive dealer intervention to restore.