I agree that you should check for a better wiring diagram. I have the two volume factory set for my Caravan and most of the second book is wiring diagrams. I my case the lockup is accomplished by grounding a lead from the transmission and I will have to wire it so the computer still sees voltage or it will think the solenoid is burnt out and set a code. In Mass I can't pass inspection with the check engine light on. The brake light switch sounds like the best option for unlock but I would suggest a bright RED light as a visual reminder. It shouldn't take long for you to get into the habit of unlocking, when was the last time you forgot to put in the clutch while driving a standard?
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