shifting problems in a 1989 GMC S-15 THM 700 R4?

TIMBOSLICED

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How does the ECM send the signal through to the torque converter lockout solenoid ? the Wires coming into the tranny valve body area goes to a thermostatic switch first, then branches over to a "torque converter clutch signal switch " and then to the converter solenoid. I have replace the TC Lockout solenoid and still cant get out of FIRST. is the TC clutch signal switch my next option. I have no idea how to test it. And what does the "thermostatic switch" do in the whole design of things ?
1.http://i492.photobucket.com/albums/rr288/gunner4440/Torqueconverterclutchsignalswitch.jpg
2.http://i492.photobucket.com/albums/rr288/gunner4440/trans1-1.jpg


1 is the torque converter clutch signal switch (normally opened electrically)
2 is the thermostatic switch, That one is odd I dont know how to test it either.
 
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