DTC B1944 - Center Impact Sensor Not Mounted To Vehicle Properly
WARNING: This page is about a different car, the 1996 Ford Ranger and 1996 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Before proceeding, see SERVICE PRECAUTIONS . After servicing has been performed, recheck AIR BAG warning light. If system is okay, install air bag modules and reactivate air bag system.
- Verify Condition
Connect NGS tester to DLC. Perform ON-DEMAND SELF-TEST. If DTC B1944 is retrieved, go to step 2). If DTC B1944 is not retrieved, go to step 6). - Measure Resistance
Deactivate air bag system. See COMPLETE SYSTEM DEACTIVATION under DISABLING & ACTIVATING AIR BAG SYSTEM . Disconnect air bag diagnostic monitor. Use ohmmeter to measure resistance between terminal C2-21 and ground. See Figure. If resistance is more than 3 ohms, go to next step. If resistance is less than 3 ohms, go to step 5). - Check impact Sensor To Ground
Disconnect center impact sensor from harness. Measure resistance between ground and circuit 618 (Pink/Light Green wire) in sensor connector. If resistance is less than 3 ohms, repair open or high resistance in circuit 618 (Pink/Light Green wire) between air bag diagnostic monitor and center impact sensor. Inspect all connections. Reconnect system and go to step 10). If resistance is not less than 3 ohms, remove screws retaining sensor. Clean mounting surface of sensor and chassis. Install sensor. Tighten screws to specification. See TORQUE SPECIFICATIONS . Go next step. - Check PID CRSHSN1
Use ohmmeter connected to ground to measure resistance of circuit 618 (Pink/Light Green wire) at center impact sensor connector. If resistance is less than 3 ohms, reconnect system and go to step 10). If resistance is more than 3 ohms, replace right impact sensor. Reconnect system. Go to step 10). - Check Reference Ground
Check ground connections and splices in circuit 570 (Black/White wire) feeding air bag diagnostic monitor harness connector terminals 10 and 18. If any poor connections are noted, correct problem and if necessary add a ground strap from circuit 570 (Black/White wire) to one of the diagnostic monitor mounting fasteners. Connect air bag diagnostic monitor. Verify system and go to step 10). If connections are okay, replace air bag diagnostic monitor. Reconnect system. Verify system. Go to step 10). - Check For DTC Service
Deactivate system. See COMPLETE SYSTEM DEACTIVATION under DISABLING & ACTIVATING AIR BAG SYSTEM . If DTC B1944 has just been repaired, go to step 10). If not, go to next step. - Check Wires
Inspect wires, crimps, connectors, etc. on circuits 618 (Pink/Light Green wire) for signs of poor connection. Connect NGS to DLC. Select IABM. Select Pid/Data Monitor and Record. Select Pid CRSHSN1. Wiggle wires while watching PID. If reading goes greater than 3 ohms, or other problems are noted, repair and go to step 10). If not, go to next step. - Check Sensor
Connect NGS to DLC. Select IABM. Select Pid/Data Monitor and Record. Select Pid CRSHSN1. Wiggle wires while watching PID. If PID goes greater than 3 ohms, or other problems are noted, replace center impact sensor. Repair any other problems and go to step 10). If not, go to next step. - Check Circuit 570 (Black/White wire)
Inspect attachment of ground connections and splices in circuit 570 (Black/White wire) feeding diagnostic monitor harness connector terminals C1-10 and C1-18. See Figure. If any problems are noted, repair as necessary. If necessary add ground strap from circuit 570 (Black/White wire) to one of the diagnostic monitor mounting fasteners. Connect air bag diagnostic monitor. Go to step 10). If no problems are noted, remove retaining screws for center impact sensor and clean mounting surface of sensor and chassis. Install sensor. Tighten screws to specifications. Go to step 10). - Check For Other DTCs
Connect NGS to DLC. If other DTCs are retrieved go to proper DTC test. If no other DTCs are retrieved, reactivate system and clear all DTCs.