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.
DTC 1945 - Left Front Impact Sensor Not Mounted To Vehicle Properly/Ground Circuit Open: Description
The air bag diagnostic monitor measures resistance between C277-20, circuit 620 (Purple/Light Blue wire) and reference ground at terminal C276-18, circuit 57 (Black). If diagnostic monitor measures difference of more than 3 ohms between ground at C276-18 and ground at C277-20, DTC B1945 will be stored in memory and AIR BAG warning light will flash Code 45. If condition is serviced or corrected, DTC B1945 will be stored in memory.
NO RELATED
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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.