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.
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HOMESERVICE MANUALSFORD1998TAURUS V6-3.0L DOHC VIN SREPAIR AND DIAGNOSISRESTRAINTS AND SAFETY SYSTEMSAIR BAG SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSD: LFC 21/DTC B1921- GND RESIST HI/MODULE NOT MOUNTED PROPERLYTEST NOTES
1998 Ford Taurus V6-3.0L DOHC VIN S
Test Notes
1998 Ford Taurus V6-3.0L DOHC VIN SSECTION Test Notes
Normal Operation
The air bag Electronic Crash Sensor (ECS) module monitors the resistance between the ground connections at its housing and the reference ground at Pins 21 and 22. If the ECS detects a resistance greater than 100 ohms, it will store a Diagnostic Trouble Code (DTC) B1921 in memory and flash a Lamp Fault Code (LFC) 21 (or higher priority code if one exists) on the air bag indicator.
Possible Causes
High resistance between the ECS module housing ground and pin ground could be caused by:
^ improper tightening torque of the ECS module retaining bolts.
^ high resistance on both ECS logic grounds.
The air bag Electronic Crash Sensor (ECS) module monitors the resistance between the ground connections at its housing and the reference ground at Pins 21 and 22. If the ECS detects a resistance greater than 100 ohms, it will store a Diagnostic Trouble Code (DTC) B1921 in memory and flash a Lamp Fault Code (LFC) 21 (or higher priority code if one exists) on the air bag indicator.
Possible Causes
High resistance between the ECS module housing ground and pin ground could be caused by:
^ improper tightening torque of the ECS module retaining bolts.
^ high resistance on both ECS logic grounds.
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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.