A Coding doesn’t show any effect?

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Carly for BMW informs you when a coding completed successfully.
Successful means that the coding was placed correctly in the control unit. The app checks this after a successful writing.

The requirement for a successful coding to show its effect is normally found in the coding description within the app.

If you don’t see any effect after a successful coding, it has one of the following reasons:

  • Some codings have numbers next to them (1/3, 2/3, 3/3). Please make sure you activate all codings in these cases.
  • Some codings need to be activated for different keys. Please make sure you activate these codings for all keys.
  • Please read the description of the coding found in the app. There you will find additional codings mentioned that need to be activated.
  • For very popular codings we have collected recipes. You can find them here.


  • For daytime running lights the light switch has to be set to 0 or A.
  • For welcome lights the light switch has to be set to A or 2.
  • The coming home lights are actived by using the headlight flasher after turning the ignition off.
  • After coding control units are often restarted. This can lead to certain functions needing to be reactivated (one-touch signal in iDrive, signal lights when un-/locking in iDrive, etc.)
  • For many key fob functions it often helps to press the button longer or to stand closer to the car (you may have a weak battery in the key fob).
  • If the voltage is very low it can happen that the vehicle turns off consumers (welcome light, signal lights when un-/locking, etc.) in order to save energy.


Control units do not know all the built in equipment of a vehicle. It is possible that a coding was accepted without the necessary equipment for this coding being installed.

For instance, to date BMW has up to 6 different mirror wirings. For the mirror folding to work after coding a LIN-bus needs to be built in. This is often the case for mirrors with external heating.

The acoustic signal when locking/unlocking requires a built in siren (found in anti-theft systems). Without one, the coding can still be activated, but there won’t be an audible signal when locking/unlocking the car.

We have had numerous reports, where turning off neighboring voltage monitorings did the trick.
So if you are trying to deactivate voltage monitoring for the front signal lights, try disabling the voltage monitoring for all front lights.

Then, turn on each voltage monitoring one by one until you find out which one worked.

  • Restore the module to the last backup before you tried the coding. You can see here how this is done.
  • Perform a diagnostic and clear all faults.
  • Wait 20-30 minutes with ignition off. This ensurs the car is out of diagnostic mode.
  • Try the coding again.


If this doesn’t work, please send us a session log from within the app with the following information:

  • Which coding in which control unit shows no effect?
  • Did you check if other codings need to be set?
  • Have you verified your car’s settings?
  • Does your car have the necessary equipment installed?