This is because there are acutally 3 horns on a VW. The alarm horn has its own dedicated horn. The actual horn that is activated when using your steering wheel is 2 different harmonizing tones. If you have a MK4 jetta (99.5-2005) then the horn is behind the bumper cover on the driver side. Previous models are somewhere on the passenger side. I would suggest getting a helper and have him/her press the horn while you test for voltage at the horn terminals with a multimeter.
Wednesday, April 14th, 2021 AT 11:00 AM