Locksmith Automotive Locksmithing 3 — Questions and Answers
Question 1: What is a 'jigglers' or 'tryout key' set used for in automotive locksmithing?
- Programming transponder chips by trial and error
- A set of pre-cut keys used to try to open locks by feel and manipulation (Correct answer)
- Decoding the ignition cylinder bitting depths
- Cutting keys on a manual key machine
Correct answer: A set of pre-cut keys used to try to open locks by feel and manipulation
Jiggler or tryout key sets contain numerous pre-cut keys that a locksmith tries in a lock, manipulating them to find a combination that operates the lock.
Question 2: A 2018 Ford F-150 requires a new key programmed. The customer has zero working keys. Which method would typically be required?
- Simple self-programming using the ignition on/off sequence
- OBD programming using a professional key programmer with the security PIN (Correct answer)
- Cloning from another Ford F-150 key
- Only a Ford dealership can program this vehicle
Correct answer: OBD programming using a professional key programmer with the security PIN
When no working keys exist for PATS-equipped Fords, a professional programmer tool with the correct PIN obtained via NASTF or similar service is required for OBD programming.
Question 3: What is the purpose of a 'Pin Code' or 'Security PIN' when programming automotive keys?
- It is the numeric code cut into the mechanical key blade
- A manufacturer-issued code that authorizes the ECU to accept a new key during programming (Correct answer)
- The frequency code used by the key fob transmitter
- A diagnostic trouble code generated when key programming fails
Correct answer: A manufacturer-issued code that authorizes the ECU to accept a new key during programming
The security PIN is a vehicle-specific code provided by the manufacturer that must be entered into programming software to authorize the ECU to learn a new key.
Question 4: Which tool would a locksmith use to create a new key for a vehicle when the original key is present but worn?
- An automotive scope to measure ignition voltage
- A key duplicator or cloning device to copy the original before it fails completely (Correct answer)
- An EEPROM reader to extract the immobilizer code
- A lockpick set to decode the worn cylinder
Correct answer: A key duplicator or cloning device to copy the original before it fails completely
Duplicating or cloning a worn key while it still functions is the most efficient approach, creating a working spare before the original fails entirely.
Question 5: What does the term 'transponder frequency' refer to in automotive key systems?
- The radio frequency the key fob uses for remote locking/unlocking (typically 315MHz or 433MHz)
- The resonant frequency at which the key's passive chip communicates with the antenna ring (Correct answer)
- The update frequency of the ECU security software
- The vibration frequency used in sonic key cutting machines
Correct answer: The resonant frequency at which the key's passive chip communicates with the antenna ring
The transponder chip in an automotive key communicates with the ignition antenna ring at a specific resonant frequency (typically 125kHz) to transmit its unique code.
Question 6: A customer reports their push-button start vehicle starts but immediately stalls. What is the most likely cause?
- Dead key fob battery preventing remote start
- Transponder not recognized — the car started mechanically but the immobilizer cut fuel/ignition (Correct answer)
- Faulty brake light switch preventing gear selection
- Low tire pressure triggering a safety shutdown
Correct answer: Transponder not recognized — the car started mechanically but the immobilizer cut fuel/ignition
Crank-but-stall is a classic immobilizer symptom where the engine starts momentarily on mechanical ignition but shuts down when the ECU doesn't recognize the transponder code.
Question 7: When drilling out an automotive ignition cylinder as a last resort, what is the MOST critical consideration?
- Using a left-hand drill bit to catch the cylinder if it spins
- Knowing the exact shear line location to avoid damaging the ignition switch behind the cylinder (Correct answer)
- Choosing the largest drill bit available for speed
- Disconnecting the battery before beginning any drilling
Correct answer: Knowing the exact shear line location to avoid damaging the ignition switch behind the cylinder
Drilling too deep will destroy the ignition switch or wiring behind the cylinder, so the locksmith must know exactly where the cylinder ends and the switch begins.
Locksmith Automotive Locksmithing 3
What is a 'jigglers' or 'tryout key' set used for in automotive locksmithing?