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The board is under the cap in the Wiper Motor.
Trouble code P1870 means: Transaxle Component Slipping (4T60-E)
Left Front Speed Signal Missing - possibly ABS related - will research more
The OBD II ECM (On Board Diagnostic II Engine Control Module) would be found under the hood, on top of the passenger side inner fender.
It is under drivers side dash board beside steering colum
On Board Diagnostic ( two ) I believe the first model year was ( 1996 )
The manual will have the exact location of the fuse for the PCM. If you are trying to do a reset then disconnect the neg battery cable for 10 minutes. www.trailvoy.com
Look under the dash board near steering column
Behind the ash tray.
It is under the hood, on the driver side
It is important to know the location of all electrical parts of a car. The OBD port of the 2003 Honda Odyssey is found under the dashboard, on the right side of the center console.
That vehicle would have the "OBD II" system.