Horn Assembly problems of the 2009 Toyota Tacoma

Airbag warning light on and horn does not work. After researching, learned this is an airbag clock spring (otherwise known as a spiral cable) issue that has a related recall for 2005-2009 Toyota Tacomas under campaign number 12v-092. That recall applies only to 7 channel circuit spiral cables and not the 16 channel ones. The 7 channel circuits are steering wheels without the audio controls, where the 16 channel circuits have steering wheel audio controls. Toyota dealer wants to charge $400 for part, plus labor. Absolutely ridiculous when this is an obvious problem that is occurring regardless of the channel circuit type. My daughter has a 2008 Toyota tundra with exact same problem.