@heccxon how and where di you try to install the camera? Did you tap into any wiring harness etc? I do not think it is as easy as a single relay. To many things have stopped working that are not on one relay nor are they related. Post some images of anything that you may have cut to splice etc. Post those images with your question so that we can see what you see. [guide|21499]
Remove the battery cable and leave it off for 15-30 minutes. Then reconnect and see what happens. Make sure that you have your radio code (if needed) before doing this.