http://money.cnn.com/2013/10/17/autos/toyota-spiders-airbag-recall/index.html?hpt=hp_t2
*Snip*
Toyota is recalling 870,000 vehicles because a problem with an air conditioner part could cause airbags to deploy unnecessarily.
In some cases, the problem was caused by spiders. Sometimes, their webs can create a blockage in a drainage tube coming from the air conditioning condenser. That can cause water to drip down onto an airbag control module, causing a short circuit. That, in turn, could cause the airbag warning light to light up on the dashboard and it could even cause the dr