Hi there, My SRS light is on it happened after I got a garage to repair the horn, could it be a loose wire in the steering wheel or something else as I don't really know where to start ???

 

Start by taking the car back to whom ever repaired the horn. Have them check it out since they worked in the steering wheel area.

It is possible that they removed the airbag/horn without disconnecting the battery, which would trigger the warning light.