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sometimes the LCM will kill power to the defective circuit, to prevent a short circuit... since you have the OE tails and the replacements - when you swap them, the OE tails always work? There are only 4 pins on the replacement lights, one of them is bound to be ground, so the other 3 are for the individual lights/light banks... a ground wire on the car harness should be brown without any other marking, can be verified by an OhmMeter... that will leave you with 4 other pins (from the picture looks like 4 pins, could be 3 remaining... the fender tail light (not the one on the bottom hatch) has a dedicated turn signal, a parking light and a brake light, which is 3 circuits... that means, you have one ground and 3 individual circuits on the light that need to be matched to ground and 3 individual circuits on the car...
I agree, this is much more than a plug-and-play should involve, but it is doable - it is not like you have a harness with 25 wires...
Also, are you able to bench test the new lights? to see if they actually work to begin with...
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