Most service contracts are written around major mechanical and electrical failures, and many leave out items that simply wear out in ordinary use. A wiper blade, a bulb, a fuse, a key fob battery, or a floor mat is a small cost, but these are the items most likely to belong to nobody. Giving each one a clear owner keeps the car working and keeps small jobs from piling up unnoticed.
Why wear items sit outside the promise
A contract is a promise about specific kinds of failure, and wear items are usually described as things expected to be replaced over time. Look at the exclusions list and the defined terms together. Phrases such as wear and tear, normal deterioration, or consumable often decide whether a part is covered. If the exclusion language is broad, assume the small items are yours to handle.
Build the owner list
Write down each wear item, how often you expect to replace it, and who will do it. Wiper blades and bulbs are often simple to swap yourself or to have done at routine visits. Fuses can be checked at the same time as the bulbs. Key fob batteries are usually replaced at home. Floor mats and interior trim wear with the seasons and with the people who ride in the car. Assign each item to you, a shop, or a household member, and keep the list in the glove box with the contract.
Keep the record that shows the work was done
If a claim involves a component that failed after a wear item was ignored, the provider may look at whether routine care was done. Keep receipts for replaced wipers, bulbs, and other parts, with the date, the mileage, and what was done. A simple notebook works. The record answers questions later, and it supports the rest of the car's upkeep as well.
What to ask the provider
Ask which items the contract treats as wear parts and whether any lamp, glass, or trim component is excluded by name. Ask whether a failure caused by a wear item is treated differently from a failure of an item the contract covers. Ask for those answers in writing and keep them with the contract.