Test S: Right Side Crash Sensor Communication Fault (DTC U2018): Description
WARNING: This page is about a different car, the 2002 Lincoln Navigator and 2002 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
Restraints Control Module (RCM) monitors 2-wire current loop to left side crash sensor for signal that is out of expected range. If RCM detects an out-of-range signal, indicating a sensor communication fault, it will store Diagnostic Trouble Code (DTC) U2018 in memory and flash Code 45 on AIR BAG warning light.