Fj80 diff lock issues
 

I have a 1993 fj80.
My rig is parked on a hard surface, and when I start the truck, the Diff Lock engages and the ABS light also lights up on the dash. I can feel the Diff Lock is on, and it won't disengage. I have tried, putting it in reverse and backing up a little bit and driving forward. It doesn't disengage.
Any Help is appreciated.

get onto some loose ground. do some figure eights until it disengages.