How do i make this lightbar plugin script event work?

i don't know where i need to place a change can someone tell me and show it

local m = game.Players.LocalPlayer:GetMouse()
db = true
m.KeyDown:connect(function(k)
	k = k:lower()
	if k == "l" then
		if db == true then
			local veh = game.Workspace:FindFirstChild(script.Parent.CarName.Value, true).Body
			local siren = veh
			siren.lights.on = true
			db = false
			wait(3)
			db = true
		end
	end
end)