2000 Mustang GT has odd tone sound
This tone is not like seat belt ding, ding, but a solid tone, abt 1 second long, goes off intermittently, now and then, lasts a minute, sometimes 2 or 3 minutes. It's a warning of some sort, but what? No dash warning lights go on. ABS light is on, but tone came on waaaay before that. I don't think it's related to ABS light at all. What is this tone from??