CML CML Automotive Locksmithing

Question 1

What is the most reliable method for originating a key for a vehicle when no original key exists?

Accepted Answer

VIN decoding for code cutting

Answer

Code cutting using the vehicle's VIN or manufacturer key code (obtained after ownership verification) is the most reliable origination method.

Question 2

What is a transponder in an automotive key system?

Accepted Answer

A microchip in the key head that communicates with the vehicle's immobilizer

Answer

A transponder is an electronic chip embedded in the key head that transmits an authorization code to the vehicle's immobilizer to permit starting.

Question 3

What is the GM VATS (Vehicle Anti-Theft System) key feature?

Accepted Answer

A resistor pellet embedded in the key blade that must match a specific resistance value

Answer

VATS uses a resistor pellet embedded in the key blade; the ignition reads its resistance value and will not allow starting if it doesn't match.

Question 4

What is the most important thing to verify before cutting a key for a vehicle?

Accepted Answer

Proof of ownership such as title, registration, or ID matching registration

Answer

Verifying proof of ownership protects the locksmith from liability and ensures keys are only provided to the vehicle's legitimate owner.

Question 5

Which tool is used to determine a vehicle lock's bitting without removing the cylinder?

Accepted Answer

A decoder or tryout key set

Answer

Decoder tools and tryout key sets allow a locksmith to read the bitting of an existing lock cylinder without disassembly.

(CML) Certified Master Locksmith Practice Test