where is the elec. cont. for abs located found smallbox under rear seat ?

 

That's the deceleration sensor you found if it has an arrow on the top.

 

Cheers mate thought so but still looking for electric control unit for the abs system .?

 

I did a bit of looking at the ABS using info posted in another thread about a different issue:

"this is for a 97 but should give you some idea of where things are. hope it helps"

https://www.dropbox.com/s/gh95k8p0onlv507/97XJ.pdf

As I understand it the ABS has its own dedicated wiring.
Start looking on 5-30 that's where the ABS info starts.
HTH
Troy