<!--
{
  "availability" : [
    "iOS: 18.0.0 -",
    "iPadOS: 18.0.0 -",
    "macCatalyst: 18.0.0 -",
    "macOS: 15.0.0 -",
    "watchOS: 11.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "CarKey",
  "identifier" : "/documentation/CarKey/RemoteKeylessEntryConfigurableEnduringAction/functionID",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "CarKey"
    ],
    "preciseIdentifier" : "s:6CarKey44RemoteKeylessEntryConfigurableEnduringActionV10functionIDAA18FunctionIdentifierVvp"
  },
  "title" : "functionID"
}
-->

# functionID

The vehicle-specific code that identifies which feature you
want to control.

```
let functionID: FunctionIdentifier
```

## Discussion

You define the function identifiers for your vehicles
and what features they represent.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)