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ThinkPad NotebooksThinkPad T400 / T500 and newer T series Laptops Knowledge Base

T420: Bluetooth is not working when pressing Fn+F5


We have purchased two units of ThinkPad T420 (4236-CJ4). The bluetooth is not working. I have tried different drivers but same issue. It just did nothing when I press Fn+F5.


What can I do to get this functioning?


  • Press Fn + F5 to enable Bluetooth. If there is no response please install the Hotkey Features Integration found in Lenovo support site-->  http://support.lenovo.com
  • Once it is installed ensure the WLAN master switch is on
  • Restart the system
  • Press  Fn + F5 to enable wifi  & Bluetooth

You should be able to use Bluetooth now.

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richk On 2013-12-04, 4:23 AM

Make sure the bluetooth module is not disabled in the BIOS, under Security/I-O Port Access

kstrid On 2014-06-09, 16:10 PM

I use T420s 4174-FM9


Suddenly none of the Fn buttons are working (like enable Bluetooth). I have reinstalled the Hotkey Drivers and checked the BIOS setting ref above.


Any clue how to check further?

shekharsaad On 2017-06-14, 4:35 AM

just install advanced system care and make windows vulnaberality fix

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