Occupant Classification Sensor Fault
This code indicates a problem with the airbag occupant classification 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 car’s computer has detected that the sensor which determines if there's a passenger in the front seat is not working properly. This could mean the system can't tell if someone is there, which is crucial for airbag safety.
What the computer is actually seeing
The airbag control module is not receiving the correct data from the occupant classification sensor, which monitors weight and presence in the passenger seat.
What a healthy reading looks like
Expected voltage from the occupant sensor should be between 0.5V and 4.5V depending on weight detected; typical resistance values are 2.0kΩ to 10.0kΩ.
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 passenger seat occupant classification sensor connector for damage or corrosion. If damaged, repair or replace the connector.
- 22. Check the wiring from the occupant sensor to the airbag control module for continuity. Repair any broken or shorted wires.
- 33. Test the occupant classification sensor using a multimeter. Verify it provides the expected voltage based on weight present in the seat. Replace the sensor if it’s out of spec.
- 44. Clear the fault code and perform a test drive to see if the code returns. If it does, further testing of the airbag module may be required.
Common causes
- Faulty occupant classification sensor
- Wiring or connector issues in the sensor circuit
- Damaged airbag module
- Calibration issues with the airbag system
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
Yes, but the airbag system may be disabled for the passenger seat, which is a safety risk in a collision.
Will this code come back after clearing?
If the underlying issue isn't resolved, the code will likely return after driving.
Why does this code pair with B1511?
B1511 indicates a similar fault in the sensor circuit, confirming there’s a broader issue with the classification system.
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