keyless entry problem

i have a 1994 explorer xlt, and since about 1 year ago, i started noticing that my unlock functions stopped working from the switches inside the truck. when i press the unlock button, all of the exterior lights come on, and i hear a clicking coming from underneath the dashboard. plus, the keyless entry module in the driver's rear quarter panel is making some serious clicking noises. does it sound like a short in the wiring, or could it be something else? i really need help finding out which module in the rear panel is the keyless entry module.

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