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Old 10-10-2019, 10:47 PM   #1
autoloclys
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Default Horn = rear wiper

On my 92 240 wagon the horn is unreliable, if I got the right spot it usually beeps. Often when it does work the rear wiper triggers as well.


I've started tracing the wires back but so far not finding any obvious crossed wires.

If anyone has solved similar issues I'd love a pointer in the right direction
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Old 10-11-2019, 06:55 AM   #2
cleanflametrap
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It isn't a crossed wire. The horn causes not only audible noise, but a good bit of electrical noise which gets into the rear wiper's intermittent (delay) circuit inductively through proximity in the wiring harness. Sounds like voodoo, but the trouble has come up before, and I seem to recall fixed when the fuse panel got some cleaning attention (to the horn fuse). Or was it a loose ground on the steering column...

Either way, whatever fixes your horn to be reliable will probably alleviate the unintended cleaning of the wagon window.
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Old 10-11-2019, 08:59 AM   #3
bobxyz
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There's a ground wire between the steering column and the chassis tunnel. If either end is making poor connection, honking the horn feeds voltage to the rear wiper motor and kicks off a wipe cycle. Start with the column end - remove the plastic cover and find the ground screw (top left side). Clean up the connections and tighten. If this doesn't fix it, you'll need to pull the carpeting back to get to the tunnel screw.

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Old 10-11-2019, 12:49 PM   #4
cleanflametrap
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Default Closer view at column

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Old 10-11-2019, 12:56 PM   #5
dl242gt
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Just FYI. Long ago a friend bought a new 93 245 back in may 93. Brand new the car had this excact problem. So think of it as a feature.

From what I recall he fixed it with the exact suggestions from Art and Bob above.
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