If you mean holding a car key fob/remote-control button for about 5 seconds, the exact result depends on the vehicle and which button you hold.
What it can do
- Lock/unlock: Some vehicles use a long press to activate additional functions, such as closing windows or opening all windows.
- Trunk/boot: Holding the trunk button may open the trunk, release it, or activate a power tailgate.
- Panic/alarm: On some remotes, holding the panic button for several seconds activates the vehicle’s alarm.
- Remote start: Some cars use a sequence such as press Lock, then press and hold the Remote Start button for several seconds. Other manufacturers use different sequences.
- Comfort functions: Certain vehicles allow long-pressing Lock to close windows/sunroofs or long-pressing Unlock to open them.
Important point
There is no universal “5-second” function for car remotes. Holding a button longer does not necessarily activate anything, and repeatedly experimenting with buttons can trigger the alarm or another unintended function.
If you tell me the car’s make, model, and year (for example, 2021 Toyota Camry), I can explain exactly what happens when you hold the remote for 5 seconds and the correct procedure.