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

It disables the rear power window controls for child passengers

Answer

It locks the door from the exterior only when activated

Answer

It automatically engages when the vehicle exceeds 20 mph

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 vehicle's current mileage and service history

Answer

The vehicle's color and trim level

Answer

The model year alone is sufficient

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

Vertical, with the key inserting from above

Answer

Diagonal at a 45-degree angle

Answer

Full-rotation rotary requiring a 360-degree key turn

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

The trailer hitch connection and receiver tube

Answer

The backup camera wiring behind the tailgate panel

Answer

The tire pressure sensor signals on the rear axle

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

Use adhesive to hold the cylinder temporarily until a clip arrives

Answer

Leave the cylinder loosely seated inside the door panel

Answer

Drill out the cylinder and install an aftermarket rim lock as a substitute

Question 6

In a power sliding door system (common on minivans), what additional component manages lock engagement compared to a standard hinged door?

Accepted Answer

A dedicated door control module and motorized latch assembly

Answer

Only the BCM with the same standard actuators used on hinged doors

Answer

A mechanical cable operated solely by the sliding track mechanism

Answer

A vacuum-operated lock system common to that vehicle platform

Question 7

What is the recommended verification procedure after rekeying a door lock cylinder before returning the vehicle to the customer?

Accepted Answer

Test smooth operation in both lock and unlock directions with the new key, and verify the old key no longer operates the cylinder

Answer

Only verify the key turns smoothly in the unlock direction

Answer

Confirm the VIN on the cylinder matches the vehicle registration

Answer

Check that the door ajar warning light functions correctly on the dashboard