Test Q: Right Side Crash Sensor Communication Fault (DTC U2018): Description
WARNING: This page is about a different car, the 2002 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
RCM monitors right side crash sensor circuit loop for signal that is out of range. If RCM detects signal that is out of range, indicating communication fault, it will store Diagnostic Trouble Code (DTC) U2018 in memory and flash Code 45 on AIR BAG warning light.