CAL Automotive Door and Trunk Lock Systems 3

Question 1

What is the function of the child safety lock located on the interior edge of most rear vehicle doors?

Accepted Answer

It prevents the rear door from being opened from the inside when engaged

Answer

The child safety lock engages a mechanical block on the interior door handle linkage so the door cannot be opened from inside, preventing children from accidentally opening doors while the vehicle is moving.

Question 2

When cutting a door lock key by code for a vehicle with no existing key, what information is essential to obtain?

Accepted Answer

The vehicle's VIN and/or factory key code

Answer

The VIN (or factory key code from a database) is required to look up the correct bitting specifications for cutting an accurate replacement key for that specific vehicle.

Question 3

Which lock cylinder orientation is standard for passenger car door locks in North America?

Accepted Answer

Horizontal, with the key inserting parallel to the ground

Answer

North American passenger vehicle door lock cylinders are almost universally oriented horizontally so the driver inserts the key parallel to the ground, which provides the most natural and ergonomic wrist movement.

Question 4

A pickup truck tailgate lock is difficult to operate with the key, and lubrication has not improved the situation. What should the locksmith inspect next?

Accepted Answer

The worn or damaged wafers inside the cylinder and the tailgate alignment

Answer

When lubrication fails to resolve binding, worn internal wafers and tailgate misalignment (which creates lateral stress on the cylinder) are the most likely culprits requiring physical inspection.

Question 5

What is the correct professional procedure when the original door lock cylinder retaining clip is broken and a replacement is not immediately available?

Accepted Answer

Source the correct OEM or compatible aftermarket retaining clip before completing the repair

Answer

Professional repair standards require sourcing and installing the correct retaining clip to ensure the cylinder is properly secured; temporary or improvised fixes on security components are unacceptable.

(CAL) Certified Automotive Locksmith Practice Test

(CAL) Certified Automotive Locksmith Practice Test

CAL Automotive Door and Trunk Lock Systems 3