One or both side airbag modules may fail resulting in illumination of the airbag warning light. Side airbag modules determined to be faulty should be replaced.Google+
Car Problem Reports
Mitsubishi Endeavor Airbag light on due to faulty side airbag module
Mitsubishi Endeavor Problem
Average Mileage: 107,333 mi (80,000 mi - 130,000 mi)
Visitor, 2005 Mitsubishi Endeavor, 112,000 mi
Had the same problem with the airbag light. Havnt had it fixed yet.