Key Programming and Remotes Flashcards
7 cards from real CAL practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Key Programming and Remotes flashcards as text
What is the primary difference between a transponder key and a proximity (PEPS) key?
Answer: Transponder keys contain a glass-encapsulated chip that responds to exciter coil energy; PEPS keys use active RF for push-button start without inserting the key
Transponder keys house a passive chip energized by the ignition coil ring, while PEPS (Passive Entry/Passive Start) keys transmit actively so the vehicle can be unlocked and started without inserting the key.
When performing an OBD-II key programming procedure, which tool interface is most commonly used to communicate with the vehicle's BCM or IMMO module?
Answer: OBD-II DLC (Data Link Connector) with J1850 or CAN protocol
The OBD-II DLC, located under the dash, uses protocols like CAN Bus or J1850 to allow programming tools to communicate with the immobilizer or BCM.
A technician is programming a new remote key fob but the vehicle only accepts one key during the programming session. What is the most likely cause?
Answer: The vehicle has already reached its maximum stored key limit
Most vehicle immobilizer systems have a finite limit (commonly 4–8 keys); once that limit is reached, no additional keys can be programmed without deleting existing ones.
What does 'key learning' via EEPROM mean in automotive locksmithing?
Answer: Reading and writing the immobilizer's secret data directly from the ECU chip to clone or add a key
EEPROM-based key learning involves physically reading the immobilizer data from the ECU chip (often soldered on the board) and writing a new key's crypto token directly into that memory.
Which frequency is most commonly used by North American OEM remote keyless entry (RKE) systems?
Answer: 315 MHz
315 MHz is the standard frequency for most North American OEM RKE fobs, while 433.92 MHz is more common in European and Asian markets.
A 2018 Ford F-150 requires a new transponder key. The technician finds the vehicle is equipped with the PATS (Passive Anti-Theft System). Which chip type does PATS most commonly use?
Answer: Texas Instruments 4D/80-bit
Ford PATS systems on late-model F-150s commonly use Texas Instruments 4D or 80-bit transponder chips for encrypted immobilizer communication.
When synchronizing a remote key fob that has fallen out of sync with the vehicle, what is the recommended first step?
Answer: Replace the fob battery and attempt re-sync using the vehicle's built-in programming mode
A weak or dead battery is the most common cause of sync loss; replacing it and running the vehicle's onboard programming sequence often restores communication.