I purchased the impulse 500 and now it seems the crossfader is not working and not being recognized by djing program Serato

Hi,

1) Look at the position of the crossfader curve switch located on top of DJControl Inpulse 500 top panel between the 2 volume faders:
left = mix curve
centre = scratch curve
right = disabled.

2) If you do not write the version of Serato DJ Lite /Pro (for example Serato DJ Lite 3.1.1 in Windows), maybe calling Hercules technical support
https://support.hercules.com/en/contact-en/  
would be easier for you than posting on a forum which always requires spending the time to describe in detail your technical configuration.

Crossfader not recognized in djuced? what can I do?

Hello,

You should read the message to which you answer and ook at the position of the crossfader switch on DJControl Inpulse 500: 
- left = mix curve
- centre = scratch curve
- right = disabled
So move the crossfader switch on left or centre, as it is normal the crossfader is disabled if the switch in on right position.