---
title: functionID
framework: CarKey
role: symbol
role_heading: Instance Property
platforms: [iOS 18.0+, iPadOS 18.0+, Mac Catalyst 18.0+, macOS 15.0+, watchOS 11.0+]
path: carkey/remotekeylessentryconfigurableenduringaction/functionid
---

# functionID

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

## Declaration

```swift
let functionID: FunctionIdentifier
```

## Discussion

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