Passenger Presence Sensor Fault
Fault in the passenger presence sensor system detected.
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 computer is saying the system that checks if a passenger is in the seat isn't working right, so it can't tell if the airbag should be on or off.
What the computer is actually seeing
The airbag control module monitors the resistance from the passenger presence sensor. If the resistance is outside the normal range (typically between 1-2 ohms), it triggers code B1449.
What a healthy reading looks like
Expected sensor resistance values should be between 1-2 ohms when occupied, and at least 10 ohms when unoccupied.
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 wiring and connectors for the passenger presence sensor under the seat. Look for any visible damage or corrosion. If found, repair and retest.
- 22. Check the resistance of the passenger presence sensor with a multimeter. If it's outside the expected range (1-2 ohms occupied, at least 10 ohms unoccupied), consider replacing the sensor.
- 33. Test the passenger presence sensor by sitting in the seat and checking if the resistance reads as expected. If everything is okay but the code comes back, suspect the airbag control module.
Common causes
- Faulty passenger presence sensor
- Wiring issues (broken or shorted wires)
- Connector problems (corrosion or loose connections)
- Seat cushion damage affecting the sensor placement
- Faulty airbag control module
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's best to fix it soon as it affects airbag deployment if there's a passenger.
Will this code clear on its own?
Not usually; it requires a diagnosed fix, or it will stay active.
Why does this code pair with others?
Similar faults in the airbag system can trigger multiple codes, indicating a common issue.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →