CAL Automotive Locksmith Key Cutting & Programming 5

Question 1

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

Accepted Answer

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

Answer

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.

Question 2

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?

Accepted Answer

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

Answer

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.

Question 3

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

Accepted Answer

OBD 'add key with working key' procedure

Answer

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

Question 4

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

Accepted Answer

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

Answer

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

Question 5

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:

Accepted Answer

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

Answer

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.

(CAL) Certified Automotive Locksmith Practice Test

(CAL) Certified Automotive Locksmith Practice Test

CAL Automotive Locksmith Key Cutting & Programming 5