---
title: functionID
framework: CarKey
role: symbol
role_heading: Instance Property
platforms: [iOS 16.0+, iPadOS 16.0+, Mac Catalyst 16.0+, macOS 13.3+, watchOS 9.0+]
path: carkey/remotekeylessentryenduringaction/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.

## See Also

### Getting the Action Details

- [actionID](carkey/remotekeylessentryenduringaction/actionid.md)
- [recipientVehicleID](carkey/remotekeylessentryenduringaction/recipientvehicleid.md)