DTC 12: Cruise Control Switch (Resume/ACCEL Switch)
WARNING: This page is about a different car, the 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
Perform DTC 22. If DTC 22 checks out okay, and DTC 12 is still indicated in condition detection mode of on-board diagnostics, replace cruise control module. See CRUISE ACTUATOR under REMOVAL & INSTALLATION.