Horn Is the Chevy Malibu made by KIA? Is there a common problem with the horn module? I bought this 2005 Malibu second-hand. Some time thereafter, I realized the horn didn't work. Hubby checked the electronic connections, found the horn module had been moved from proper setting. He moved it to where it was supposed to be....horn kept sounding off till the plug was placed where he found it. We now don't have a horn...safety issue. Thanks in advance for your assistance.

No the Chevy Malibu is not made by Kia!
I think you mean horn relay
I would try a new relay it is possible that the relay is defective and that's why it was removed
here is how the horn circuit works
The body control module (BCM) controls the horn relay by grounding the control circuit of the horn relay coil. When the horn relay coil is grounded, the horn relay contacts close, applying voltage to the horn via the horn supply voltage circuit.
if the horn relay does not fix your concern you may need to take it to a shop and check for any BCM fault codes
and you are correct having no horn is a SAFETY ISSUE
that car should have NEVER PASSED A SAFETY WITHOUT A HORN
hope this helps good luck and I hope the relay fixs it because a BCM is costly