Greetings, all.

I've been wrestling with a horn problem on my 1993 940 sedan for a couple of weeks. Finally, I got a good answer from a reliable old mechanic friend. Let me preface all this by saying thanks to Spook and Herb Goltz for their exchange a while back on this subject. Removing the air bag did seem extreme, but I was already to do this with Spook's helpful advice (remove battery negative cable, wrap in plastic and let sit for a minimum of 30 minutes).

My mechanic said to always check the steering column ground (grounds to the dashboard) which is a bolt, tightened with a 10mm socket (or combo wrench) and located directly below the box molding which surrounds the turn signal/winshield wiper levers. Previous to doing this, I had cleaned all electrical contacts involved in the horn connections (including a liberal spraying of the horn collector ring with P'Blaster) EXCEPT the tabs which plug up to the buttons themselves. The reason I didn't was they LOOKED perfectly clean and corrosion-free.

After tightening the column ground bolt (which was tight when I found it) and getting no horn, I then took each of the horn buttons off, got a drill with a small wire brush on it and went to town on the horn button tabs. VOILA!

I now have a horn. Lesson learned (reiterated in many posts on the Brickboard): ground disconnects (typically due to corrosion) are the number one culprit in electrical problems.

Gilbert

1993 940 196K, 1980 GLE 350K