Code 11
WARNING: This page is about a different car, the 1995 Toyota Tercel. However, it is still accessible from the selected car via links, so may be relevant.
Indicates short to ground in circuit between center air bag sensor and either air bag; faulty air bag; short to ground in circuit between front air bag sensor and center air bag sensor; faulty front air bag sensor; +S and -S circuits between front air bag sensor and center air bag sensor are shorted together; faulty spiral cable; or faulty center air bag sensor.