CPST - Certified Child Passenger Safety Technician Seat Belt System Installation Questions and Answers

Question 1

A CPST is helping a caregiver install a forward-facing car seat in a 2015 vehicle.
The lap/shoulder belt has a sliding latchplate and an emergency locking retractor.
After routing the belt through the correct path and buckling it, how should the technician instruct the caregiver to lock the seat belt to ensure a secure installation?

Accepted Answer

Use a metal locking clip within one inch of the latchplate to secure the lap and shoulder portions of the belt together.

Answer

Pull the shoulder belt all the way out to engage the automatic locking mode, then feed the slack back into the retractor.

Answer

Twist the seat belt buckle up to three times to remove slack from the system.

Answer

The seat belt will lock automatically upon impact; no further action is needed after tightening.

Question 2

When checking a car seat installation that uses the vehicle's seat belt, what is the maximum allowable movement at the belt path?

Accepted Answer

Less than 1 inch side-to-side and front-to-back.

Answer

No movement at all.

Answer

Less than 2 inches side-to-side.

Answer

Movement is acceptable as long as the seat belt is buckled.

Question 3

Which of the following methods is the correct way to engage the locking mechanism on a switchable retractor?

Accepted Answer

Slowly pull the shoulder portion of the seat belt webbing all the way out to the end, then allow it to feed back in.

Answer

Push a button located on the retractor itself.

Answer

Slide a switch on the latchplate from the 'unlocked' to 'locked' position.

Answer

Buckle and unbuckle the seat belt three times in rapid succession.

Question 4

A caregiver is struggling to buckle the vehicle seat belt through a rear-facing car seat's belt path and asks if they can use a seat belt extender. What is the correct guidance for a CPST to provide?

Accepted Answer

No, seat belt extenders change the geometry of the belt system and must never be used to install a child restraint.

Answer

Yes, as long as the extender is from the vehicle manufacturer.

Answer

Yes, but only if it provides a more secure fit for the car seat.

Answer

No, unless the child restraint manufacturer specifically allows it in the manual.

Question 5

A CPST is inspecting a car seat installed with a lap-only belt that has a locking latchplate. How is this type of seat belt properly locked?

Accepted Answer

By pulling the webbing tight; the latchplate's design prevents it from loosening.

Answer

By feeding the tail of the seat belt webbing back through the latchplate.

Answer

By using a belt-shortening clip because locking latchplates are not secure enough.

Answer

By slowly pulling the entire belt out of the retractor and letting it retract.

Question 6

Which of the following is a common and critical error when installing a car seat with a vehicle seat belt?

Accepted Answer

Failing to lock the seat belt, resulting in a loose installation over time.

Answer

Ensuring the seat belt webbing lies flat without any twists.

Answer

Checking the car seat manual for the correct belt path.

Answer

Applying firm pressure to the car seat while tightening the belt.