Found an post on the web that clarify why my sport button still function in my JDM h22A auto, not 100% sure if my TCU is an P19 or not will have to check.
"About the JDM TCU's having the Sport/Normal driving mode capabilitiy: I'm attaching a picture of the shifter knob that came with my JDM front clip. If you also have a JDM auto transmission TCU with the part # 28100-P19-003, you probably have the Sport/Normal circuit built into it. My understanding is that when you lock in the "Sport" mode, the transmission computer raises the shift points. You can utilize this circuit by using a rocker switch or toggle switch, one side of the switch is wired to TCU wire D20, the other side of the switch is wired to ground.
"About the JDM TCU's having the Sport/Normal driving mode capabilitiy: I'm attaching a picture of the shifter knob that came with my JDM front clip. If you also have a JDM auto transmission TCU with the part # 28100-P19-003, you probably have the Sport/Normal circuit built into it. My understanding is that when you lock in the "Sport" mode, the transmission computer raises the shift points. You can utilize this circuit by using a rocker switch or toggle switch, one side of the switch is wired to TCU wire D20, the other side of the switch is wired to ground.
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