Obd socket

[mk375]

See the following topic, it may give you some pointers for where to look.

MX5 MK3 2.0 OBD Port Not working....

    NO (thank god) The main fuse protects the car from reverse battery connection. I’m amazed that an MR2 has this feature, or where it’s located. - Also a risk if damage to the loom, or worse case, a fire?