Bazza wrote in
:

Got a 52 Reg Zafira and recently one horn button has failed to work
intermittently. It will only work when the steering wheel is turned
slightly to one side so I guess it is a wiring loom issue?

My query is, how much of a job is it to replace without risking the
air bag going off.

The MOT is due in July and a new loom looks to cost around £15. The
Zafira is well worth repairing as it has only done 28,000 miles in 18
years.

Try this for ideas:

https://www.youtube.com/watch?v=zg8JHcxEW2E