How To Fix Galaxy S9 And Galaxy S9 Plus Back Button Not Working

If you own a Samsung Galaxy S9 or S9 Plus you may be wondering why your back button is not functioning properly. The keys that are not functioning on your Samsung Galaxy S9 or S9 Plus are the ones, which light up as you tap them. So if the keys light up it will indicate that your smartphone is working.
This means that if the lights do not light up on your Galaxy S9 or Galaxy S9 Plus then you can assume they are not working properly. Below we will discuss methods on how to solve these problems if your returns key or Home button is no longer functioning.
Most users originally think that when the Touch Key on your Samsung Galaxy S9 or Galaxy S9 Plus is not working it is broken but this is not always the case. You may have to enable a setting for the feature to start working as it may be turned OFF.
With the feature turned off you will save battery on your Samsung Galaxy S9 or Galaxy S9 Plus, which is why Samsung has this set to default. In the steps below you can learn how to turn on Touch key lights for your device.  

Fixing the Touch Key Light Not Working:

1. Start by making sure your Samsung Galaxy S9 or Galaxy S9 Plus is on
2. If it isn’t, hold down the power button
3. The menu should already be open
4. Now you need to navigate to the Settings Options
5. Tap the “Quick Settings” menu
6. Then select the “Power Saving” option
7. Navigate to the “Power Saving Mode” option
8. Find the “Restrict Performance” option
9. Lastly, uncheck the boxes to “Turn off touch key light”

You will now find that your Sdevice touch key lights will light up again.