CAL Automotive Door and Trunk Lock Systems

Question 1

What type of linkage is most commonly used to connect a door lock cylinder to the latch mechanism in modern vehicles?

Accepted Answer

Cable linkage

Answer

Rigid rod linkage

Answer

Hydraulic linkage

Answer

Pneumatic linkage

Question 2

Which component inside a door lock actuator converts electrical energy into mechanical movement?

Accepted Answer

Solenoid or DC motor

Answer

Capacitor

Answer

Relay switch

Answer

Hall effect sensor

Question 3

When a door lock cylinder spins freely without engaging the latch, what is the most likely internal cause?

Accepted Answer

Broken or worn wafers/tumblers inside the cylinder

Answer

Faulty actuator motor

Answer

Corroded door striker plate

Answer

Misaligned door hinge

Question 4

What is the primary function of the 'deadlock' (double-lock) feature found on many European vehicles?

Accepted Answer

It prevents the door from being opened even from the inside

Answer

It locks the door against remote key fob operation only

Answer

It disables the central locking module

Answer

It automatically engages the parking brake

Question 5

Which specialized tool is used to remove a door lock cylinder without damaging the surrounding trim?

Accepted Answer

Lock cylinder puller or removal hook

Answer

Slim jim tool

Answer

Air wedge

Answer

Steering wheel puller

Question 6

In a central locking system, which module receives the key fob signal and sends commands to all door lock actuators simultaneously?

Accepted Answer

Body Control Module (BCM)

Answer

Ignition switch module

Answer

Starter relay control unit

Answer

Fuse and relay box

Question 7

Before rekeying a door lock cylinder to match an existing key, what must the locksmith verify first?

Accepted Answer

The key's bitting compatibility with the cylinder's keyway and wafer depths

Answer

The vehicle's current mileage

Answer

Whether the power actuator is functional

Answer

The age and model year of the vehicle