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Old 06-17-2009, 08:54 PM   #5 (permalink)
Christ
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
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Pasta - '96 Volkswagen Passat TDi
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A manual lockup switch is a two-way setup... you can just tap the lockup solenoid while leaving it attached to the ECU, so that when the ECU thinks it should be locked, it will still send the signal, even if you've already got it locked w/ the manual switch.

On the other hand, if you engage the manual switch, it will be locked, even if the ECU says "no".

Basically, when someone else is driving, the switch is utterly useless, and they probably won't ever touch it/know what it does. When you're driving, you can impress us all with your extra 2-3 MPG b/c you can lock it manually, without affecting anything. (Except you may get a CEL.. not sure.)
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