2010-072
SUBJECT:
TROUBLESHOOTING DTC B1447/B1448/B1764/B1767 (AIRBAG WARNING LAMP ILLUMINATED) ON VEHICLES WITH ELECTRIC FIELD OCCUPANT CLASSIFICATION SENSOR
This bulletin provides information relating to the occupant detection and classification system on certain Sorento (XM), Optima (MG), and Rio (JB) vehicles, as shown below:
| Model | Model Years | Applicable Production Dates |
|---|---|---|
| Sorento (XM) | 2011 to current | All 2011 MY to current |
| Optima (MG) | 2009, 2010 | August 28, 2008 to current |
| Rio (JB) | 2010 to current | March 3, 2010 to current |
The purpose of this TSB is to ensure a proper response to the appearance of certain DTC codes that identify a certain temporary condition. on these vehicles, the occupant detection and classification system uses an electric field sensor instead of a pressure sensor. The customer is advised in the owner’s Manual not to place any electronic device on or near the seat cushion because it can defeat the OCS. The electric field sensor is sensitive to interference from certain electronic devices, and is also sensitive to the seat getting wet.
If certain electronic devices such as cellular phones, laptop computers, inverters, DVD players, radio transmitters, GPS navigation systems, satellite radio systems, video games, and MP3 players are put on/around a passenger seat cushion (including in the seatback pocket) or if liquid is spilled on the seat cushion, the airbag warning lamp may illuminate with DTC B1447, B1448, B1764, or B1767.
| DTC Description |
|---|
| B1447: OC passenger ECU Defect |
| B1448: OC passenger Sensor Mat Defect |
| B1764: BodySense MAT Defect |
| B1767: BodySense Algo Cut-off |
Before attempting to diagnose or repair the occupant classification system:
- Verify that the seat cushion is completely dry.
- Verify that nearby electronic devices are turned off.
- Clear DTC(s).
- If DTC(s) do not re-code after this, review the above information with the customer. Do not attempt to make a repair.
- If DTC(s) do re-code after this, proceed with diagnosis according to Service Information on KGIS.
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Last update on 2026-05-25 / Affiliate links / Images from Amazon Product Advertising API
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B1764 is a mat sensor code, it’s the passenger mat sensor. It has nothing to do with the clock spring, that’s in your steering wheel. Take some electronic cleaner(sell it at walmart) unclip the yellow wires under the passenger seat spray them(let them dry) plug them in erase the codes.. done.
I have been getting code b1764 passenger mat sensor defect, I took it in to kia they said it was the clockspring in the steering wheel which happened to be a recall so I let them do their thing went picked up my car 4 days later the airbag light comes back on so now I’m almost certain it’s the passenger sensor inside the seat.. please help me thank you.
b1764 is MAT Sensor Code, you have to get it diagnosed properly. It could be a bad MAT Sensor, or wiring. First thing to do, is to try clear the code.
I had the same issue happen to me too. I took it in for the clockspring and then few days later my airbag light came back on took it back in and now my passenger ocs mat defect code b1764 is throwing. Kia is telling me it has nothing to do with the clock spring..the light was never on til they replaced the clockspring. Ugh.