.lua call function on initialisation of vehicle

Programmed a vehicle .lua function. With a keyboard binding it works just fine.
However I want the function to start running as soon as the car is spawned.
How can I do that? I thought init() / onInit() would do exactly that but for some reason it doesn't work?


Ending of the .lua script:

local function init()
regenEnabled = true
M.regenerate()

-- run this code when the vehicle is loaded?!?
end

-- public interface
M.regenerate = regenerate
M.cancelRegenerate = cancelRegenerate
M.onReset = onReset
M.updateGFX = updateGFX
M.sendState = sendState
M.init = init

return M