CAL Key Programming and Remotes 2

Question 1

What is the primary difference between a transponder key and a proximity (PEPS) key?

Accepted 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

Answer

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.

Question 2

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?

Accepted Answer

OBD-II DLC (Data Link Connector) with J1850 or CAN protocol

Answer

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.

Question 3

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?

Accepted Answer

The vehicle has already reached its maximum stored key limit

Answer

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.

Question 4

What does 'key learning' via EEPROM mean in automotive locksmithing?

Accepted Answer

Reading and writing the immobilizer's secret data directly from the ECU chip to clone or add a key

Answer

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.

Question 5

Which frequency is most commonly used by North American OEM remote keyless entry (RKE) systems?

Accepted Answer

315 MHz

Answer

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.

(CAL) Certified Automotive Locksmith Practice Test

(CAL) Certified Automotive Locksmith Practice Test

CAL Key Programming and Remotes 2