B00B4 code meaning
Driver Seat Occupant Classification Sensor E
What B00B4 means
B00B4 is the fifth and last driver seat classification sensor. No carmaker documents the code publicly. A fifth input need not weigh anything: IEE's BodySense uses capacitive sensing in the seat surface, placed over the heater mat, under the cover and on top of the foam, and tells a child restraint from a seated person whatever the belt tension, posture, weight or height; IEE says the vehicle maker does not have to calibrate it and that it serves the FMVSS 208 advanced airbag rules. Other designs add a belt tension sensor so that a tightly cinched child seat is not taken for a heavy adult. Whether E stands for such a field sensor, a mat or another load cell is the maker's decision. When B00B4 is stored, the airbag lamp is lit and that input is ignored.
B00B4 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of B00B4
- Airbag warning lamp on
- Possible related faults of the seat heater on the same seat
- Safety note: airbag system; work on seat and sensor plugs only de-energised; after replacing a sensor or trim follow the maker's calibration, specialist workshop only
Common causes of B00B4
- Most likelyOpen or poor contact in the seat harness or plug to input E
- PossibleDamaged seat heater or trim where the capacitive electrode shares its layer
- Less likelyInternal fault of the fifth classification sensor or its electronics
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Driver classification sensor eSRS seat wiringSRS control module
What each part of B00B4 means
| B | Body system: airbags, seat belts, power seats, lights and climate control. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B4 | The exact fault in that area. |
What to do next
- Note B00B4 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about B00B4
What does B00B4 mean?
B00B4 means "Driver Seat Occupant Classification Sensor E". B00B4 is the fifth and last driver seat classification sensor. It is a generic code, so it means the same on every make.
Is it safe to drive with B00B4?
B00B4 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will B00B4 fail an emissions test?
B00B4 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is B00B4 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will B00B4 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.