CPL Automotive Lock & Transponder Systems 2

Question 1

What does the term 'rolling code' refer to in remote keyless entry systems?

Accepted Answer

A code that changes with every button press to prevent replay attacks

Answer

Rolling codes (also called hopping codes) change with every transmission, preventing thieves from capturing and replaying the signal.

Question 2

Which tool is most commonly used to decode automotive lock bitting without disassembly?

Accepted Answer

Lock scope or borescope

Answer

A lock scope or borescope allows a locksmith to visually inspect the wafer or pin positions inside an automotive lock to determine the bitting.

Question 3

What is the primary function of a VAT (Vehicle Anti-Theft) resistor pellet in GM ignition keys?

Accepted Answer

It provides a specific resistance value the vehicle ECU reads to allow starting

Answer

GM's VATS system reads the resistance of a pellet embedded in the key blade; an incorrect resistance value prevents the engine from starting.

Question 4

When cutting a high-security automotive key with a sidebar, which additional dimension must be accounted for?

Accepted Answer

The sidebar warding cuts or milling

Answer

High-security keys with sidebars require additional sidebar cuts or milling on the key blade that must match the sidebar pins inside the lock.

Question 5

A customer's transponder key starts the car sometimes but not always. What is the most likely cause?

Accepted Answer

Weak or failing transponder chip

Answer

Intermittent transponder failures are commonly caused by a damaged or failing chip that only communicates with the antenna intermittently.

(CPL) Certified Professional Locksmith Practice Test