Washed van the horn started in its own

[Riley26]

I washed my van and not long after the horn started sounding on its own. Any ideas? I guess water got somewhere it shouldn't.

[miniman]

Possibly into the horn.

[Riley26]

Is it likely it may dry out and be OK or not?

[Lincsls1]

Yes, it may dry out and be ok. Only time will tell.
Did you wash under the bonnet at all?

[Riley26]

No not under the bonnet. A tiny bit on the steering wheel though with a dryish spongue.

[Riley26]

My central locking has also gone funny 😩

[Lincsls1]

I had wondered if you might have developed an alarm issue. Often car alarms use the horn and with the central locking playing up it might be related.

[Captain Answer]

Open up any enclosures where there are electrics i.e. fuses, ecu, battery etc, you might find a nice puddle of water in there causing issue

[Penelope Stopit]

Water won't directly power a horn

As mentioned above, water in a control unit or alarm system

[spikeyhead]

I'll guess there's a blocked drain somewhere.