What condition is classified as a major defect in the occupant compartment door?

A condition where the door fails to open is classified as a major defect because it directly compromises the safety and accessibility of the vehicle's occupant compartment. This issue can prevent occupants from exiting the vehicle in emergency situations, posing a significant risk. It impairs the primary function of the door, which is to provide access for entry and exit, thus affecting the overall safety and operability of the vehicle.

The other conditions, while they may indicate issues with the door, do not necessarily prevent its fundamental purpose. For instance, a door latch not functioning properly can be a serious concern, but if the door can still open manually, it may not be classified as a major defect in the same way. Visible damage or cosmetic issues like peeling paint might indicate deterioration or maintenance needs but are not critical safety issues that would classify the door as having a major defect. Thus, the failure of the door to open represents the most significant threat to the functionality and safety of the vehicle occupants.