Automotive Lock & Transponder Systems Flashcards
7 cards from real CPL practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Automotive Lock & Transponder Systems flashcards as text
What is a 'proximity key' or 'smart key' system, and how does it differ from a standard transponder key?
Answer: It communicates passively without requiring key insertion, enabling push-button start
Proximity (smart) keys use low-frequency signals to communicate with the vehicle passively; the driver can start the vehicle without inserting the key, as long as the fob is inside.
Which attack method exploits smart key systems by extending the signal range to trick the vehicle into unlocking?
Answer: Relay attack
A relay attack uses two devices to amplify and relay the smart key's signal over a long distance, tricking the car into thinking the fob is nearby.
What does the 'EEPROM dump' process accomplish when servicing a lost-all-keys vehicle?
Answer: It reads the raw binary data from the immobilizer module's memory chip for analysis or modification
An EEPROM dump reads the raw contents of the chip's memory, allowing the locksmith to extract security codes or clear stored transponder IDs.
A Volkswagen vehicle requires a 4-digit PIN code to program keys via OBD. Where is this PIN typically obtained?
Answer: From the dealer using the VIN, or via EEPROM extraction from the immobilizer module
VW/Audi SKC (Secret Key Code) is either obtained from the dealer using the VIN (with proof of ownership) or extracted via EEPROM programming from the immobilizer.
What is the correct procedure when a newly cut transponder key turns the ignition but the engine cranks and immediately dies?
Answer: Program or re-program the transponder chip to the vehicle's immobilizer
Cranks-and-dies behavior is a classic immobilizer response: the key blade is correct mechanically, but the transponder is not recognized, so the ECU cuts fuel/ignition.
Which tool category is used to bypass or read automotive immobilizer data directly through the OBD-II port?
Answer: Automotive diagnostic programmer (e.g., Autel, Launch, Xhorse VVDI)
Automotive diagnostic programmers connect via OBD-II and use vehicle-specific protocols to read immobilizer data and program new transponder keys.
What is the significance of a 'dealer PIN' or 'immobilizer code' in the context of BMW EWS systems?
Answer: It is a secret code stored in the EWS module required to synchronize new keys
BMW's EWS (Electronic Immobilizer) requires an ISN (Individual Serial Number) or module-specific code to synchronize new keys, extracted from the EWS EEPROM or DME.