ASE Damage Analysis & Estimating Certification (B6) Practice Test 2025 - Free ASE Certification Practice Questions and Study Guide

An air bag system is designed to deploy in the event of a collision, providing critical safety measures to protect the occupants of a vehicle. This system typically includes various components such as impact sensors, which detect the force of a collision and trigger the deployment of the air bags. Seat belt tensioners are also integral to the safety system, as they tighten the seat belts during a crash to secure passengers in their seats. Additionally, a diagnostic control module monitors the entire air bag system, ensuring it functions properly and can alert the driver to any issues.

In contrast, brake pads serve a different function related to the vehicle's braking system. They are not related to the air bag system and therefore do not play a role in air bag deployment or passenger safety in terms of collision protection. Thus, brake pads are the correct answer for being the component that is not usually part of an air bag system.