My horns on my 1994 S500 ( W140 series chasis ) just sqeak when I attempt to blow them so I want to remove them for repair or replacement. I found where they are located, one on each side of the car behind or actually inside of the bumper assembly and behind the under bumper grill.

I can not find anyway to get to them. Do I have to remove the lower engine compartment cover or do I have to remove the bumper. There must be an easier way. This has really got me stumped.

Can anyone assist me?