Automotive Locksmith Security & Anti-Theft Technologies Flashcards

A technician discovers that a vehicle's EEPROM data contains a 'key counter' set to maximum. What does this indicate?

Answer: The vehicle has reached its maximum number of programmed keys and no additional keys can be added without resetting or replacing the module

Many immobilizer systems limit the total number of keys that can ever be programmed; reaching this limit locks out further key additions until the module is reset or replaced.

What is the purpose of the 'kill switch' as an anti-theft device in older vehicles without OEM immobilizers?

Answer: A hidden switch that interrupts a critical circuit (fuel, ignition, or starter) to prevent the engine from starting without its activation

A kill switch is a hidden manual switch wired to interrupt the fuel pump, ignition, or starter circuit, preventing engine start without its activation.

When a locksmith clones a transponder key, what data is typically copied to the new chip?

Answer: The transponder's unique identification code and, where applicable, the encrypted authentication data

Cloning copies the transponder's UID and any stored authentication data needed for the immobilizer to accept the cloned key as valid.

What security vulnerability does OBD port protection address in modern vehicles?

Answer: Unauthorized programming of new keys or theft of PIN codes by plugging a device into the unguarded OBD-II port

Thieves can plug inexpensive devices into unprotected OBD-II ports to program blank keys in minutes; OBD port locks physically block this access.

What is 'frequency hopping' and why is it relevant to automotive key fob security?

Answer: A technique where the transmission frequency changes pseudo-randomly to prevent signal interception and jamming

Frequency hopping spread spectrum (FHSS) rapidly switches transmission frequencies, making it difficult for attackers to intercept or jam the signal.

A customer reports their car starts with the key but the security light stays on. What does this typically indicate?

Answer: The immobilizer system has partially failed or a transponder mismatch is logged, but the vehicle learned the key during a bypass condition

A persistent security light with a running engine often indicates a fault code in the immobilizer system, sometimes from a previous failed key learn or partial transponder recognition.

What is the locksmith's ethical and legal obligation when asked to program a key for a vehicle the customer cannot prove they own?

Answer: Refuse the service until the customer provides verifiable proof of ownership such as a title, registration, or ID matching the vehicle

A locksmith must verify ownership before providing key services to prevent facilitating vehicle theft; valid ID and proof of ownership are minimum requirements.