This happened to me. Take it to the dealership and they'll fix it. Look at my post:
http://www.gm-trucks.com/forums/topic/172605-diode-mod-caused-mylink-system-to-stop-working-void-warranty/
Hello I'm trying to connect my puddle lights to my cargo lights with a diode. I cannot see your picture well so could you tell me what is the slot of the puddle lights?
I've been wondering would it be possible to have the lights underneath the side mirrors turn on when you press the cargo lights button? By this you can turn on the side mirror lights with the cargo lights. And with the previous mod the reverse would turn the cargo and the cargo would turn on the side mirror lights as well. Would anyone know how?
I have a question regarding a modification I would like to do on my truck that goes along with this mod. I've been wanting for my cargo lights/ bed LEDs to turn on when you use the fob to unlock the doors. Has anybody tried this or perhaps know how to accomplish this?