F 450 4WD Super Duty V8-6.4L DSL Turbo (2008)
press and release the 7/8 button a second time.
4. Release the 3/4 button. The horn chirps once if auto-unlock is disabled or twice (one short chirp followed by a honk) if auto-unlock is enabled.
press and release the 7/8 button a second time.
4. Release the 3/4 button. The horn chirps once if auto-unlock is disabled or twice (one short chirp followed by a honk) if auto-unlock is enabled.