so my 99 XJ sport doors have stopped locking and unlocking all together. My Key fob also no longer works, even after a battery change. I have diagnosed the issue down to the the keyless entry receiver located in the dome light housing. When I unplug it from the system, the locking/unlocking works just as they should when I use the door switches. I can't for the life of me figure out how to check for continuity on the receiver harness which is where I am at. If a wire is broken, where would it be, or is the Receiver likely just shot?