Airbag Deployment Circuit Open
Fault in the airbag deployment circuit signaling an issue with the system.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The airbag control module isn't receiving a proper signal from the deployment circuit, which could be due to wiring or sensor failure.
What the computer is actually seeing
The airbag control module expects a certain resistance in the airbag deployment circuit, typically around 2-3 ohms when the circuit is intact. When it reads an open circuit (infinite resistance), it triggers the fault code B1947.
What a healthy reading looks like
Expected resistance must be between 2-3 ohms; if the resistance is not in this range, the system sees it as a fault.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the airbag deployment circuit wiring for visible damage or abrasion. Decision: If damaged, repair the wiring. If not damaged, proceed to step 2.
- 22. Check all connectors related to the airbag control module for corrosion or loose connections. Decision: Clean or secure connectors as necessary before moving to step 3.
- 33. Measure the resistance in the airbag deployment circuit; it should be around 2-3 ohms. Decision: If not in range, replace the airbag sensor. If within range, proceed to step 4.
- 44. Clear the codes and test drive the vehicle to see if the error returns. Decision: If the code reappears, consider replacing the airbag control module.
Common causes
- Damaged wiring in the airbag deployment circuit
- Faulty airbag sensor
- Poor connector contacts at the airbag module
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it's not safe because the airbag may not deploy in a collision.
Will this code come back after clearing?
Yes, if the underlying issue isn't fixed, the code will return.
Why does this code relate to other airbag codes?
They all indicate issues within the airbag system's deployment or circuit integrity.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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