I'll bet that the horn ring is worn and a loose end has kicked up and is making contact just like
your key did.  Pull the steering wheel to check.  See:

http://gerry.vanagon.com/cgi-bin/wa.exe?A2=ind0208D&L=vanagon&P=R17885

In the meantime, get under the front of the van and unhook the wires, or pull the horn(y) fuse.

My van's wipers only work when the blinker or headlights are 'on'.

m2cw   Malcolm

--- Jim Felder <felder@KNOLOGY.NET> wrote:

All the way back, she says, the horn
> would blow unless the right turn signal was on, and sometimes even
> then.  It certainly was blowing constantly when she pulled in.

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