Date registered: Jul 2004
Vehicle: 2000 E320 Wagon, 1999 E320 Sedan
Location: Seven Lakes, NC
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Horn doesn't blow after fuse,relay, and horn check
Fuses 40 and 41 are both good.
Horn blows if you connect it directly to battery power.
Horn does not blow when horn button is pressed.
To locate the horn relay, I found the part at an online parts store as part number 002542119. I removed the screws from the underhood fuse box to expose relays. The first one (black) nearest the fuses matched the number. I have two Mercedes E320's 1999 and 2000, so I removed the working relay from one and installed it in the car with defective horn. Defective car horn still does not blow. Car with working horn would not blow with relay removed (verified that the part is the correct one.) Working car horn still worked when I placed the relay from the car with defective horn. Hence I verified that I have two good relays.
Can someone direct me further?