Control module nut. MODULES & SENSORS. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Air Bag Crash Sensor. Air Bag Control Module Nut. Engine Control Module Nut. Kick Panel Trim Nut. Radio Nut. Air Bag Impact Sensor. Engine Control Module (ECM). Engine Control Unit (ECU). Ft Impact Sensor. Kick Panel Trim. Mount bracket. Radio. Tuner.