Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMERCURY1996SABLE GS, 4D WAGON, AX4NREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 32 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC TESTSDTC 1945 - LEFT FRONT IMPACT SENSOR NOT MOUNTED TO VEHICLE PROPERLY/GROUND CIRCUIT OPENTEST PROCEDURE
1996 Mercury Sable GS, 4D Wagon, AX4N
Test Procedure
1996 Mercury Sable GS, 4D Wagon, AX4NSECTION Test Procedure
WARNING: This page is about a different car, the 1997 Mercury Sable and 1997 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
- Verify Condition
Connect NGS tester to DLC. Perform ON-DEMAND SELF-TEST . If DTC B1945 is retrieved, go to next step. If DTC B1945 is not retrieved, go to step 6). - Measure Resistance
Deactivate SRS. See DISABLING & ACTIVATING AIR BAG SYSTEM . Disconnect air bag diagnostic monitor. Using an ohmmeter connected to known good ground, measure resistance of terminal C277-20, circuit 620 (Purple/Light Blue wire) to ground. See Figure . If resistance is greater than 3 ohms, go to next step. If resistance is less than 3 ohms, go to step 5). - Check Front Impact Sensor Ground
Access left front impact sensor and disconnect sensor connector from harness. Using an ohmmeter connected to known good ground, measure resistance of circuit 620 (Purple/Light Blue wire) in sensor connector C148 and ground. Subtract reading found when zeroing ohmmeter. If resistance is greater than 3 ohms, remove screws retaining sensor, clean mounting surface, and install sensor. Go to next step. If resistance is not as specified, service open circuit or high resistance in circuit 620 (Purple/Light Blue wire) between diagnostic monitor and left front impact sensor. Inspect all interconnections and reconnect system. Go to step 10). - Check PID CRSHSN2
Using ohmmeter connected known good ground, measure resistance of circuit 620 (Purple/Light Blue wire) to ground at left front impact sensor connector C148. If resistance is less than 3 ohms, reconnect system and go to step 10). If resistance is greater than 3 ohms, replace left impact sensor. See FRONT IMPACT SENSORS under REMOVAL & INSTALLATION. Reconnect system. Go to step 10). - Check Reference Ground
Check attachment of ground connections and splices in circuit 57 (Black wire) feeding air bag diagnostic monitor harness connector terminals C277-10 and C276-18. If any poor connections are noted, correct problem and if necessary add a ground strap from circuit 57 (Black wire) to one of the diagnostic monitor mounting fasteners. Connect air bag diagnostic monitor. Verify system and go to step 10). If connections are OK, replace air bag diagnostic monitor. See DIAGNOSTIC MONITOR under REMOVAL & INSTALLATION. Reconnect and verify system. Go to step 10). - Check For DTC Service
Deactivate system. See 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 (Purple/Light Blue 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
Inspect left front impact sensor for signs of corrosion. 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 Circuit 57 (BLK)
Inspect attachment of ground connections and splices in circuit 57 (Black wire) feeding diagnostic monitor harness connector terminals C276-10 and C276-18. See Figure . If any problems are noted, repair as necessary. If necessary add ground strap from circuit 57 (Black 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 left front impact sensor, clean mounting surface, and install sensor. 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. See DISABLING & ACTIVATING AIR BAG SYSTEM .
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.