Automotive Locksmith Key Cutting & Programming Flashcards

What is 'key impressioning' in the context of automotive locksmithing?

Answer: Working a blank key in a lock under tension to identify bind points, then filing cuts based on marks left by binding tumblers

Impressioning involves inserting a filed blank into the lock under rotational tension, reading the shiny marks left by binding tumblers, and filing those spots progressively until the key operates the lock.

A locksmith is cutting a high-security Medeco or Mul-T-Lock key blank on a standard code-cutting machine. What additional feature of these keys cannot be replicated by depth-only code cutting?

Answer: The angular rotation (rotation or sidebar position) of each cut, which requires specialized equipment

High-security keys like Medeco use angled cuts that interact with a sidebar mechanism; standard code cutters only control depth, not the rotational angle of each cut.

Which OBDII programming method requires a currently working (already programmed) key to remain in the ignition while the new key is being added?

Answer: OBD 'add key with working key' procedure

The 'add key with working key' OBDII procedure uses the existing programmed key's authenticated session to authorize enrollment of a new key.

A locksmith receives a key code for a Chevrolet that reads: B 43251. What does the 'B' designation most likely indicate?

Answer: It identifies the keyway or key blank series that must be used

In GM key coding systems, the letter prefix (like B, C, D, etc.) identifies the specific keyway or blank series required for that vehicle.

When using a code machine with a depth gauge to verify a freshly cut key, a locksmith finds Position 3 measures 0.05" deeper than the code specifies. This error is most likely caused by:

Answer: Cutter wear reducing the cutter's effective diameter, causing it to cut deeper than programmed

A worn cutter has a reduced diameter, which causes it to plunge deeper into the key blank than the machine's calibration expects, resulting in cuts that are deeper than specified.

For a Chrysler/Dodge vehicle using the Sentry Key Immobilizer System (SKIS), what is the maximum number of keys that can typically be programmed to the vehicle's SKIS module?

Answer: 16 keys

Most Chrysler SKIS modules support up to 8 programmed transponder keys, which is the standard limit for those immobilizer systems.

A locksmith uses a Smart Pro or similar OBDII programmer and encounters a 'security lockout' message after three failed programming attempts on a BMW. What is the correct action?

Answer: Wait for the manufacturer-specified lockout timeout period to expire before reattempting

Most vehicle immobilizer systems impose a timed lockout after multiple failed attempts as a theft-prevention measure; the locksmith must wait for the timeout to clear.