Locksmith Automotive Locksmithing 5 — Questions and Answers
Question 1: What is the difference between 'remote programming' and 'transponder programming' in automotive locksmithing?
- They are the same process performed in different sequences
- Remote programming links the fob's RF transmitter to the BCM for locks/trunk; transponder programming links the chip to the immobilizer for engine start (Correct answer)
- Remote programming is done wirelessly; transponder programming always requires physical contact
- Remote programming applies only to push-button start vehicles
Correct answer: Remote programming links the fob's RF transmitter to the BCM for locks/trunk; transponder programming links the chip to the immobilizer for engine start
These are two distinct processes: remote (fob) programming teaches the BCM to recognize RF signals for door locks, while transponder programming teaches the ECU/immobilizer to recognize the chip for engine authorization.
Question 2: A locksmith is working on a vehicle with a Vats (Vehicle Anti-Theft System) ignition system, common on older GM vehicles. What is unique about VATS keys?
- They contain a rolling-code RF chip that must be updated annually
- They have a resistor pellet embedded in the blade that must match the vehicle's resistance value to start (Correct answer)
- They are laser-cut sidewinder keys that require a specialized cutting machine
- They use two transponder chips for dual verification
Correct answer: They have a resistor pellet embedded in the blade that must match the vehicle's resistance value to start
GM's VATS (also called PASSKey) system uses a resistor pellet in the key blade; the ignition reads the resistance value and only allows starting if it matches the vehicle's stored value.
Question 3: When should an automotive locksmith use a 'bypass module' instead of programming a new key?
- When the customer wants a cheaper, permanent key solution
- As a temporary solution when proper programming tools are unavailable, or for remote starts on immobilizer-equipped vehicles (Correct answer)
- When the vehicle's ECU is completely non-functional
- When the customer has more than 3 keys already programmed
Correct answer: As a temporary solution when proper programming tools are unavailable, or for remote starts on immobilizer-equipped vehicles
Bypass modules store a programmed key's transponder signal and rebroadcast it, commonly used for remote start installations or as a temporary workaround when full programming tools are unavailable.
Question 4: What is 'key bitting depth' in automotive key terminology?
- How far the key can be inserted into the ignition cylinder
- The measured height of each individual cut on the key blade that determines which wafers or tumblers it moves (Correct answer)
- The total number of cuts present on a key blade
- The thickness of the metal key blade itself
Correct answer: The measured height of each individual cut on the key blade that determines which wafers or tumblers it moves
Bitting depth refers to the specific depth of each individual cut on a key blade, measured in increments that correspond to the tumbler heights inside the lock.
Question 5: What is the significance of 'maximum adjacent cut specification' (MACS) in automotive key cutting?
- It limits how many keys can be cut on a single machine per day
- It defines the maximum allowable depth difference between any two adjacent cuts to prevent key or lock damage (Correct answer)
- It specifies the maximum number of transponder chips one key can contain
- It is the maximum distance between the key bow and the first cut
Correct answer: It defines the maximum allowable depth difference between any two adjacent cuts to prevent key or lock damage
MACS is a manufacturer specification limiting how much adjacent cuts can differ in depth to prevent the key from damaging the lock's wafers or getting stuck.
Question 6: Which of the following best describes the 'rolling code' technology used in modern automotive remote key fobs?
- The code is always the same but transmitted at a rolling (variable) frequency
- Each button press transmits a new, synchronized code from a long sequence, preventing replay attacks (Correct answer)
- The fob rolls through all possible codes until the vehicle responds
- The code changes daily based on the vehicle's odometer reading
Correct answer: Each button press transmits a new, synchronized code from a long sequence, preventing replay attacks
Rolling code (hopping code) systems generate a new code with each use from a synchronized sequence shared by the fob and BCM, making it impossible to capture and replay a valid signal.
Question 7: A locksmith needs to open a modern vehicle with a locked steering column without damaging the vehicle. What is the recommended non-destructive entry approach?
- Drilling through the door lock cylinder to gain entry
- Using a long-reach tool and wedge/air wedge to manipulate the interior unlock button through a created gap in the door frame (Correct answer)
- Breaking the small triangular window behind the door mirror
- Removing the entire door panel from outside the vehicle
Correct answer: Using a long-reach tool and wedge/air wedge to manipulate the interior unlock button through a created gap in the door frame
The air wedge and long-reach tool method creates a small, temporary gap in the door frame to insert a rod and activate the interior unlock button without damaging the vehicle.
Locksmith Automotive Locksmithing 5
What is the difference between 'remote programming' and 'transponder programming' in automotive locksmithing?