I was in the process of installing remote start on my car and noticed a button i have not seen before. It is next to the OBD2 port under the dash. It has a tire inflation symbol and says "SET". What is the purpose?
Searching the Owner's Manual, it doesn't help that they call it TPMS, and then spell it out Tire Pressure Warning System. Anyway, starting on page 442:
I'm not sure you need to reset with each tire rotation. Can't think of a compelling reason. I haven't reset ours in years.
I've owned this car exactly 5 years and never saw it till yesterday. Any time I go to the tire store, they seem to change my air pressure from 42/40 to 32 all around and tell me of the favor they did for me. Seems like that scenario would be a good oportunity to use it when I re-inflate my tires at home.
Tell them NOT to change your tire pressure, you've already checked and set them THIS morning when the tire are cold, which is the proper way. Not while they are hot after driving on them. Then watch them.
Like @ASRDogman when I take our 2010 in for service, I ask them not touch the tire pressures. Costco is trained well. The local dealer attempted to adjust them when I went in for the J0V recall. But I reminded them that I wasn’t there for their “multi-point inspection” but for the recall and would appreciate only the recall be performed. They aren’t used to hearing that and I showed the service writer the tire pressure gauge I brought with me. I told him I will check the pressures once the car is back in my hands after the work and I will let you know if they are lower and ask for them to be returned to their previous level. Worked like a charm.
in some states it's required by law for tire people to check & properly set pressures - regardless of what owners say. Ours always get dumped 10 lb lower after they rotate, as we run at the top of its rating - preferring better mpg's & hydroplane control over ride comfort. .
If they do NOT do it while the tires are cold, the reading is inaccurate. Read the sticker on the door: COLD tire pressure. The cars owners manual states the also. ALL tire manufactures state COLD tire pressure. I believe it's on the side of some tires. I could be wrong, but I seem to remember seeing it there before. So unless they are mounting NEW tires, or you're car has been sitting for a few hours, their reading will be inaccurate. Unless it's a lot lower than it should be, like 15-20lbs. Then you probably have a leak. Just write it on the paperwork you sign when you pick up your car that the tire pressure was not checked correctly and if you are involved in an accident because of there improperly setting tire pressure, they are completely responsible. That will get their attention! I don't care if they check it, but NOT change it. I pull my phone out and start recording and state they are performing a dangerous act and are pulling my live and the lives of others around me by improperly and inaccurately changing my set tire pressure. They get scared!
