CAL Automotive Door and Trunk Lock Systems 2

Question 1

What is the primary structural difference between a trunk lock cylinder and a door lock cylinder in most vehicles?

Accepted Answer

Trunk lock cylinders typically have fewer wafer or tumbler positions

Answer

Trunk locks use double-sided keys while door locks use single-sided keys

Answer

Trunk locks do not use a cam mechanism to engage the latch

Answer

Trunk locks are always fully electronic with no mechanical override

Question 2

A customer reports that power door locks work from the interior switch but not from the key fob. What is the most likely cause?

Accepted Answer

Dead or weak key fob battery

Answer

Faulty BCM requiring reprogramming

Answer

Broken interior door lock actuator

Answer

Corroded door lock cylinder

Question 3

Which of the following best describes a 'passive entry' system on modern vehicles?

Accepted Answer

The vehicle unlocks automatically when the authorized fob is in proximity without pressing any button

Answer

The vehicle uses a mechanical key only for exterior entry

Answer

The door unlocks only after the ignition is turned to the on position

Answer

Entry requires entering a PIN code on a door-mounted keypad

Question 4

When servicing a trunk latch that will not release via the interior handle, what component should be checked first?

Accepted Answer

The release cable or actuator rod for binding or disconnection

Answer

The BCM programming and key fob pairing

Answer

The trunk weather stripping for compression issues

Answer

The transponder chip in the ignition key

Question 5

What does the term 'slam latch' refer to in automotive trunk systems?

Accepted Answer

A latch that engages automatically when the trunk lid is pressed closed

Answer

A latch requiring manual key operation every time the trunk is closed

Answer

An electronic latch that opens only via a dashboard button

Answer

A safety latch that locks the trunk above a certain vehicle speed

Question 6

If a door lock actuator tests good but the door still will not lock electrically, what is the correct next diagnostic step?

Accepted Answer

Check the wiring harness and connectors in the actuator circuit for faults

Answer

Replace the entire door panel assembly

Answer

Rekey the door lock cylinder

Answer

Reprogram the key fob to the BCM

Question 7

What is the primary reason automotive locksmiths must verify proof of ownership before performing a lockout or key replacement service?

Accepted Answer

State locksmith licensing laws and professional ethics codes require ownership verification to prevent assisting in vehicle theft

Answer

Federal FMVSS 206 mandates identity checks for all automotive services

Answer

EPA emissions regulations require vehicle owner identification

Answer

OSHA workplace safety standards require customer ID verification