When it rains, it horns (1 Viewer)

[khansmith]

When it rains hard late at night, my LX470 likes to awaken me and my neighbors with a continuous siren of the horn. The only way to stop it is to pull the fuse. I took it to the dealer and they cleaned out the sunroof drains which they claimed was the culprit. However, it rained hard the other day and the horn went off again and fuse needed to be pulled.

What other causes for the short should I be looking for?

Thank you

 

[saucebox]

Windshield would be my guess. A somewhat famous issue: Toyota Land Cruisers Are Waking Up Neighborhoods In The Middle Of The Night Due To A Ridiculous Electrical Problem - https://jalopnik.com/toyota-land-cruisers-are-waking-up-neighborhoods-in-the-1847840333

 

[Trunk Monkey]

Windshield leaking. Spray something foamy on the outside edge of the windshield, blow air from the inside, look for bubbles.

 

[whitec13]

100% your windshield, I have the same issue from time to time. My windshield surround is rusted up and let’s water in. It could also be the upper portion of your windshield molding that goes up your a-pillar coming loose.