Ok, This is my theorey, and it is restating a lot of people's ideas but I have yet to see everything summed up and justified in one post so here it goes...

Also this is my second time typing out all of this since the first time the server must have timed out and it didnt allow me to post when I was finished, needless to say im a little pissed off about that (note to self: type it in Notepad first).


The way I see it is this:

First off to answer a few questions based on my research

Hall switches are described below
http://www.simplemotor.com/hemotor.htm
http://www.melexis.com/prodmain.asp?family=US5781

Based on these descriptions of these switches, they are indeed Magnetic switches, this doesn't mean a whole lot, the only thing here to take in to account is that they act as momentary switches, thus any mechanical momentary swicthes will do.

The reason they use these Hall Effect Switches is their durability, and rigid qualities.

Secondly,

one thing that confused me was this small box in the TCU diagram that lies between F11 and the U/D poles on the switches.

to get into this we need to first know what F11(1) is; IMO it is receiving the same signal as PIN 1 on the TCU. This is a signal from the TRS indicating that it is in the correct "stick position" for autostick.

this brings me to the internal workings of this "box". I beleive it is nothing more than an AND gate which send a (-) signal (same as a ground affect)

thus
assuming U an D get the same result from this box and that pin 44 and 5 are normally low

(NOTE:USING THIS THEOREY THAT THE PINS ARE LOW, THE GND WILL BE INVERTED)

F11|GND|Result
1 1 1
1 0 0
0 1 0
0 0 0

Going on this assumption (not sure if pin 44 and 5 are low or high)

IF(the box is grounded, AND PIN 1 is engaged)

THEN switching U or D will cause the TCU to shift UP or DOWN accordingly

The question still lies, how does the TCU/Tranny know not to upshift/downshit at rev limiter when slowing down? Simple the TRS is linked to the TCU and thus when the TCU is engaged on PIN 1 the Tranny is in autostick mode.

Conclusion:

Forget about the "magic box" with the logic device, its only to ensure that you dont shift up/down using the autostick feature when the TRS is not engaging PIN 1. Thus my assumption that it is a
logical AND inside the box.


In Plain english:
Put a momentary switch on pin 44, and pin 5, Someone please verify if these are normally low or normally high; and stick it in 'L'.