When people go to a professional auto service center like repair shop or car dealership, they expect the best information, the highest-quality work and the best overall experience possible.
Service providers strive to meet these expectations through AMI and ASE certification, affiliation with organizations like BBB, AAA and local chamber of commerce and having a code of ethics as well as dispute resolution policy.
People have similar expectations when they visit a professional car wash because they are entrusting you with handling and processing their vehicles.
Just as doctors are asked to “first do no harm,” so should carwash operators. These means having more than a rudimentary knowledge of vehicles (i.e. paint systems and fabrics).
For example, there are a few things that can go wrong with an electric seat.
1) Motor failure. Like a bathroom ceiling exhaust fan, over time the armature and/or brushes in the motor will wear out. First the fan will slow down, then start making noise and then simply stop.
2) Interference. It is not uncommon for debris like drinking straw, button, disposable lighter, etc. to become lodged in the seat track which can prevent the seat from moving.
3) Wire harness. During vacuum, your staff may have inadvertently damaged or disconnected the plug leading to the wiring harness.
4) Blown fuse. This can be caused by item 2.
As for the riot act, the guy was probably angry when he came in. Maybe he had a bad day at the market or maybe he encountered someone with road rage.
Whatever the reason, your first obligation is to defuse the situation to prevent it from becoming worse.
If you don’t have the knowledge and skills to diagnosis and mitigate the problem, refer him to one of your strategic alliances.
For example, when I owned and operated carwash, I established trusting relationships with local auto body shop, auto service center, locksmith, tire store, etc.
Hope this helps.