Mazda Repair Questions? Ask Mechanics for Answers ASAP
Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner past midnight.
Hello again Chris here,
1: Did you scan it to see which codes are stored? A flashing OD light means there are trans codes stored.
2: This beeping is it the warning chime in the car, the horn, or an aftermarket siren?
You can remove both battery cables, hold them together for one minute, then reconnect 30 minutes later to reset the computers. However this will not fix the problem. It will just hide it till the computer sees the issue again. Kind of like putting bubble gum in a hole in your boat, the leak is going to come back. The codes and issues will return with diag and repairs done.
The key in reminder switch at the ignition cylinder maybe sticking and telling the instrument cluster the key is always in the cylinder and causing the instrument cluster to signal the chime. Access this switch with the steering column covers removed and ohm test this switch with the key in and removed to see if the switch is opening with the key out. With the chime going off only one wire to this switch should be powered with the key out. See the diagram below.
Please read this:
Thanks for using Just Answer, Chris
The codes would help
It can not be a cheap generic one. It needs to be sophisticated enough to have access to the transmission.