You need decoders. I'm not sure what they do but they fit in the wires behind the bulb. A pair costs about $20. I had to get them for my Dodge. This is a common problem and easy to fix. You just unplug the wiring from the bulb and plug in the decoders. It takes about 30 sec. per bulb...IF you can get at them. That can take considerably longer.
Most LED kits apparently come with decoders. Both the Fahrens and Sealites I bought had them wired in. I posted a pic of the Fahrens and you can see the decoder in line.
