Test T: Passenger-Side Air Bag Circuit Short To Ground (DTC B1938): Description
WARNING: This page is about a different car, the 2004 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.
Restraints Control Module (RCM) checks passenger-side air bag module circuit for shorts to ground by monitoring voltage at RCM harness connector terminals No. 3 (Light Blue/Orange wire, circuit No. 607) and No. 4 (Pink/Black wire, circuit No. 616). If RCM detects short to ground in either terminal, it will store Diagnostic Trouble Code (DTC) B1938 in memory and flash Code 21 on AIR BAG warning light.