WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Pinpoint Test 2: Horn Sounds Continuously (Steps 1-5)
Courtesy of MAZDA MOTORS CORP.
Fig 2: Pinpoint Test 2: Horn Sounds Continuously (2 Of 2)