Hi
.
I assume by the fact that you have autolights that you have xenon and LED tails too? Do your tails light up when your lights are turned on with your car running? How about the brake bulbs or turn signal?
Have you tried unlocking multiple times? I find that if you keep doing this i.e. just to check out your lights then the welcome lights disable until you start the car, switch off, lock and unlock again.
If that doesn't work then check your connections, there should only be two connectors, one in the centre of the back of the light unit and one in the far corner nearest the rear quarter. I believe that the centre one gives power to the bulbs, the outer one gives power to the LEDs.
Assuming you're xenon that's all I can think of as Pre-2012 (Pre-LCI) xenon equipped cars don't need an adapter harness at all, the lights are straight swap.
Can you tell us the part number of your light kit? The correct kit for cars with Xenon's ends in 282