CML CML Automotive Locksmithing 1 — Questions and Answers
Question 1: What is the most reliable method for originating a key for a vehicle when no original key exists?
- VIN decoding for code cutting (Correct answer)
- Ignition disassembly
- Impressioning the door lock
- Using a jiggler key set
Correct answer: VIN decoding for code cutting
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?
- A key with an integrated remote fob
- A microchip in the key head that communicates with the vehicle's immobilizer (Correct answer)
- A high-security laser-cut key blank
- A mechanical anti-theft key profile
Correct answer: A microchip in the key head that communicates with the vehicle's immobilizer
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?
- A laser-cut blade profile unique to GM
- A resistor pellet embedded in the key blade that must match a specific resistance value (Correct answer)
- A transponder chip in the key head
- A double-sided key for extra security
Correct answer: A resistor pellet embedded in the key blade that must match a specific resistance value
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?
- The vehicle's mileage and service history
- Proof of ownership such as title, registration, or ID matching registration (Correct answer)
- The vehicle's color and VIN match
- The vehicle's insurance status
Correct answer: Proof of ownership such as title, registration, or ID matching registration
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?
- A plug follower
- A decoder or tryout key set (Correct answer)
- An impressioning file
- A pick gun
Correct answer: A decoder or tryout key set
Decoder tools and tryout key sets allow a locksmith to read the bitting of an existing lock cylinder without disassembly.
Question 6: What does 'all keys lost' mean for a modern transponder-equipped vehicle?
- The vehicle can never be started again without dealer intervention
- All programmed transponder codes must be erased and new keys programmed from scratch (Correct answer)
- Only the door locks need rekeying
- The ECU must be physically replaced
Correct answer: All programmed transponder codes must be erased and new keys programmed from scratch
In an all keys lost situation, the locksmith must erase all existing transponder codes and program entirely new keys, often requiring specialized equipment.
CML CML Automotive Locksmithing 1
What is the most reliable method for originating a key for a vehicle when no original key exists?