I don't know how applicable this is outside the US market, or if your airbag deployment was related to this, but it might be worth looking into:
NHTSA Campaign Number: 16V065000
Manufacturer Toyota Motor Engineering & Manufacturing
Components AIR BAGS
Potential Number of Units Affected 320,409
Summary
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain model year 2003-2006 Toyota Land Cruiser and Lexus LX470, 2005-2006 Toyota Tundra and Sequoia, 2004-2006 Toyota 4Runner and Lexus GX470 vehicles equipped with side curtain-shield-air bags. The affected vehicles have an air bag control module that may be improperly programmed, causing the side curtain-shield-air bags to deploy inadvertently.
Remedy
Toyota will notify owners, and dealers will replace the air bag control module with one that has improved programming, free of charge. The recall began on December 1, 2016. Owners may contact Toyota customer service at 1-888-271-9371. Toyota's number for this recall is G0C and GLB.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to
www.safercar.gov.