CAL Transponder and Immobilizer Systems 3

Question 1

What does 'IMMO OFF' refer to in automotive locksmith practice?

Accepted Answer

Bypassing or disabling the immobilizer system via ECU modification

Answer

IMMO OFF is a technique where the ECU firmware is modified so the vehicle no longer checks for a valid transponder signal, effectively disabling the immobilizer.

Question 2

Which tool function is specifically needed to program a Megamos Crypto (ID48) transponder?

Accepted Answer

Crypto calculation using the chip's challenge-response data

Answer

ID48 transponders require specialized crypto calculation tools that can perform the mutual authentication algorithm used by Megamos Crypto chips.

Question 3

What is the function of a 'key learning' or 'key registration' procedure performed via OBD-II?

Accepted Answer

To add a new transponder's ID to the vehicle's authorized list

Answer

OBD-II key learning writes the new transponder's unique ID into the immobilizer control module's approved key list.

Question 4

A technician finds that a vehicle requires a 4-digit PIN code before adding new keys via OBD. Where is this PIN typically sourced?

Accepted Answer

From the vehicle's VIN-based database or EEPROM extraction

Answer

PIN codes for key programming are typically retrieved from a VIN-linked database service or by reading the immobilizer EEPROM directly.

Question 5

Which Honda transponder system uses a 13.56 MHz frequency and is considered a high-security chip?

Accepted Answer

Honda G-chip (46E)

Answer

Honda's G-chip uses 13.56 MHz high-frequency communication and incorporates crypto authentication, making it more secure than low-frequency 125 kHz chips.

(CAL) Certified Automotive Locksmith Practice Test

(CAL) Certified Automotive Locksmith Practice Test

CAL Transponder and Immobilizer Systems 3