At a glance
What can fail
Water or liquid can enter the air bag control module, causing internal electrical shorts. This may trigger the air bag warning light, or in rare cases, cause unexpected airbag deployment, burned wiring, or fire.
What the fix does
Dealer installs a protective shield over the air bag control module and applies waterproof grease to the connector.
Summarized — see the official notice for exact wording, dates, and contacts.