They are in A-pillars on most cars I think, as part of the overhead curtain airbag system. (They are on both of mine, anyway; I don’t have a full dataset.) The

They are in A-pillars on most cars I think, as part of the overhead curtain airbag system. (They are on both of mine, anyway; I don’t have a full dataset.) There will usually (maybe it's mandated?) be a little symbol on the pillar, like this one: https://imgur.com/20lNA99 https://imgur.com/20lNA99