Hi so I got a disco and I'm playing with buttons and I'm trying to get the rear end to raise up but when I push the button, the dash light lights up (only while holding the button). so point me in the right direction gents! thanks

 

Not just gents here.

Mine doesn't do anything until after I have driven for a few minutes. You have to be either stationary or under 20mph. Press and hold the button for a second or two. Light will flash while the rear raises and then be steady once it's at full height.

Unless your SLS air springs have been replaced with coils...

 

I looked underneath and there are bags and coils.

 

I lied it must have been the shadow of the little front mud flaps. now do you know how difficult it would be to replace the coils with the air bags?

 

The air bags are only on the rear. You can see them easily from the back of the truck.