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Switch, don't really know about your cable/car set up. The switch is pretty simple, just jumps pin 7 & 8 on the ODB connector. nothing more. Hell, I added the switch on my first Cable. If I'm not mistaken older cars needed Pin 7 & 8 connected.
If "Up" does not work then try "down". Ignition should be on. If that does not work, you have a set up issue.
What ever you do, Resist the temptation to flash your modules until you have the communications 100% sorted.
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