[brucepick]

I think drmiller has a good plan.

You could "disconnect" the same wire by pulling the correct fuse (#15) under the dash. Just know that fuse also powers the vehicle speed sensor, so don't plan on driving with that fuse pulled. But it's a clean way to see what happens when that wire is disabled. If it does the job then you can put your "cut" where you prefer it.

My car still has a clear plastic sheet showing the numbers for those underdash fuses. If you don't have it, I suppose you can find the info somewhere. You'll need it one day when something stops working and you need to chase a blown fuse!!