DTC 13: Cruise Control Switch (Ground Circuit)
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 DTCs 21 and 22. If DTC 21 and 22 check out okay, and DTC 13 is still indicated in condition detection mode of on-board diagnostics, replace cruise control module. See CRUISE ACTUATOR under REMOVAL & INSTALLATION.