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 use passive RF; PEPS keys require active battery-powered transmission at close range

Answer

Transponder keys require the ignition to be on before communicating; PEPS keys communicate while the ignition is off

Answer

Transponder keys are only used on domestic vehicles; PEPS keys are only used on imports

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

Serial RS-232 port

Answer

Infrared (IR) port near the rearview mirror

Answer

30-pin diagnostic connector under the hood

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

The vehicle's battery voltage is too low

Answer

The vehicle uses a 'dealer-only' programming mode that locks out additional keys

Answer

The EEPROM on the key fob is corrupted

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

Programming the key through the OBD port using dealer software

Answer

Teaching the remote to operate the power windows

Answer

Copying the mechanical key cut using a code machine

Question 5

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

Accepted Answer

315 MHz

Answer

433.92 MHz

Answer

868 MHz

Answer

125 kHz

Question 6

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?

Accepted Answer

Texas Instruments 4D/80-bit

Answer

Texas Instruments DST80

Answer

Megamos 48

Answer

Philips/NXP PCF7935

Question 7

When synchronizing a remote key fob that has fallen out of sync with the vehicle, what is the recommended first step?

Accepted Answer

Replace the fob battery and attempt re-sync using the vehicle's built-in programming mode

Answer

Reprogram the fob's rolling code by connecting it to an EEPROM reader

Answer

Replace the remote entirely as rolling codes cannot be reset

Answer

Perform an OBD reflash to reset the Body Control Module