Horn Assembly Problems of Mercedes Benz GL450

I turned on my 2007 mercedes Gl450 in my driveway to warm it up and 1 minute later the horn continually went off. I turned the car off and the horn continued. Smoke began from the passenger rear tail light, then a flame. 911 was called the moment we saw smoke. Within seconds the back seat was engulfed in flames and then the entire car. The flames were as high as my 2 story home. There is nothing left of this car. The amount of broken glass from all the windows blowing out down my driveway is unbelievable.

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My mb Gl450 2007 cars horn started to randomly go off for no reason multiple times. This happened three times, once when I started the car in grocery store parking lot, second time while I was driving and scared other motorist to pull over. Only way I could make it stop was to pull over and turn off the car. When I turned on the car the horn started again, turned off, turned on drove to repair shop. Repair shop told me the spring for the horn had warn out and the electronic console in the steering wheel was shot. Told me you can't order the part anymore because it was discontinued, so, we have to order a whole new steering wheel for $1,200 plus $600 in labor.

When starting the vehicle, the horn intermittently goes off and will not stop. Must turn off the car to get the horn to stop sounding. Then, must turn on the car and turn off the car a few times to make it stop until it all starts happening, randomly, again. Took the vehicle to the mercedes dealership where car was purchase and has been routinely serviced and they said the problem was a faulty steering wheel switch. The only way to fix the issue is to replace the entire steering wheel itself. The cost for an identical factory wood steering wheel (which is what the car was purchased new with) is $3,000; if we opted for a leather wrapped steering wheel instead the cost would be $1500. The other workaround is to pull the fuse and not have a horn at all. This is a safety issue and should not cost this much to have a steering wheel switch replaced! this is essential, basic equipment, and starting happening on a vehicle with less than 40,000 miles. Have continued to follow-up with dealer to see if there has been a recall or if they will fix, but mercedes is not taking responsibility for the problem.