A corroded control module can cause accidental deployment, or failure to deploy properly in the event of a collision. SUV's and full frame vehicles are more prone to steering column collapse than unibody vehicles. Be sure to check the steering column fully as part of the initial estimate. Some vehicle manufacturers do not allow wire repairs to the airbag harness. You must check each manufacturers airbag harness repair guidelines.
Manufacturers recommend airbags be deployed in a vehicle, which has been declared a total loss.