How do you turn overdrive on in a 1989 Mazda 323?

I have a 1988 Mazda 323 Automatic with M/OD(manual ovedrive). A friend who has an 89 had no trouble using the switch when he borrowed my car, so I assume it was in the same location. It operates using a button on the left side of the Shift lever. The system will not engage unless the temperature of the engine is sufficient, and the RPM is high enough. For my car, the temperature must be about 2-3 tenths of an inch above the lower temperature bar on the Engine Temperature gauge(OEM). The system typically will allow me to engage the M/OD if the speed is over 35mph.