DTC 1945 - Left 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 B1945 is retrieved, go to step 2). If DTC B1945 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 C2-20 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 Front Impact Sensor Ground
Disconnect left front impact sensor from harness. Measure resistance between circuit 620 (Pink/Light Blue wire) in sensor connector to ground. If resistance is less than 3 ohms, locate and repair open or high resistance in circuit 620 (Pink/Light Blue wire) between diagnostic monitor and left impact sensor. Go to step 10). Check all terminal crimps and splices. Repair as necessary. If resistance is more than 3 ohms, remove sensor. Clean sensor mounting surfaces. Reinstall sensor. Go step 4. - Check PID CRSHSN2
Use ohmmeter connected to good ground to measure resistance between ground and circuit 620 at left 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 left front impact sensor. Reconnect system and go to step 10). - Check Reference Ground
Check ground connection and splices in circuit 570 (Black/White wire) feeding air bag diagnostic monitor harness connector terminals C1-10 and C1-18. See Figure. Correct poor ground connections (if necessary) by adding ground strap from circuit 570 (Black/White wire) to one of the air bag diagnostic monitor mounting fasteners. Connect air bag diagnostic monitor. Verify system and go to step 10). If no poor ground connections are found, replace air bag diagnostic monitor. Reconnect system. Verify system and go to step 10). - Check For DTC Service
Deactivate system. See COMPLETE SYSTEM DEACTIVATION under DISABLING & ACTIVATING AIR BAG SYSTEM . If DTC B1945 has just been repaired, go to step 10). If not, go to next step. - Check Wires
Inspect wires, crimps, connectors, etc. on circuits 620 (Pink/Light Blue wire) for signs of poor connection. Connect NGS to DLC. Select IABM. Select Pid/Data Monitor and Record. Select Pid CRSHSN2. Wiggle wires while watching PID. If PID 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 CRSHSN2. Wiggle wires while watching PID. If PID goes greater than 3 ohms, or other problems are noted, Repair any 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. If any problems are noted, repair. 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. See TORQUE 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.