This sounds like a possible pump failure and would not be related to the horn issue.
That just sounds like the horn pad is failing. So I would make sure the pump pulley is turning when the engine is on.
If it is then I suspect the power steering pump shaft has broken. This is pretty common on these pumps. What happens is the engine starts and the shaft snaps and you have no power steering.
Below is the process for replacing the pump.
Here is a guide that will help with this as well:
https://www.2carpros.com/articles/how-to-replace-a-power-steering-pump
Let us know if you have questions. Thanks
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Wednesday, March 31st, 2021 AT 3:27 PM