Originally Posted by
BibaResto
1) I've been concerned with the 5 volt note for the dash switch to the BCM. I just spent three and a half hours (should have taken a half hour) to check the voltage of the Ltd's spoiler motor in action. I got 14.03 volts so using 12 volts shouldn't hurt the motor. I'd be inclined to think that the spoiler needs a good battery to work best.
2) If you noticed, there are limit switches on the unit - actually each side of the plastic gear. That's what the other three pin socket you have is for. I'm sorta guessing they might be 5 volt.
3) pizzaguy, other than limit switch what is their actual type of electronic hardware known as? Such as diode, or...?
I can't figure out how to get contacts in the tiny wired limit switches to be able to get a reading. There is a common black wire for both sides (a redundant statement).
4) Unless it is well hidden in the 5" high stack of the service manuals, I've not run across anything regarding how the spoiler magically raises at 62 mph and lowers at (I forget) 38 mph-ish.
1) 14 volts IS 12 volts. That is, the so called 12 volt bus rises to around 14 when the alternator is doing it's job.
2) I've never measured what is on them, but no matter, the point is that they close, pulling the sense lines to ground.
3) Those are just simple SPST switches.
4) Again, those decisions are made in the BCM based on information from the PTCM about vehicle speed.