Diagnostic unit. MODULES & SENSORS. A control module used to control the air bags and restraint systems, and monitors information gathered by sensors. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Cruise Control Distance Sensor. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Exhaust Pipe Heat Shield. Air Bag Control Module Nut. Bumper Guide Nut. Console Nut. Nut to secure Bumper cover. Part cannot be reused/reinstalled. Quarter Panel Splash Shield Nut.