B009D
Right Side Restraints Sensor 4.
- Generic
- Body
- Generic code
- High severity
How this code is built
- B
- SystemBody
- 0
- Defined bySAE, the same on every car
- 0
- AreaBody area 0
- 9D
- FaultThe specific fault in that area
What it means
B009D is a body code defined by SAE J2012 as Right Side Restraints Sensor 4. The airbag (SRS) control unit has detected a fault with that sensor or its circuit, or the sensor's data is not plausible. The generic definition does not say where 'sensor 4' sits (for example a side impact, crash or occupant sensor) or what the exact fault type is. That depends on the vehicle, so check the manufacturer's information for the model.
Symptoms
- Airbag or SRS warning light on the dashboard
- Right side airbag or restraint system may not deploy in a crash
- Seat belt pretensioner or side airbag system disabled or limited
- Passenger or occupant detection warning (on some models)
- Fault stored in the SRS module, sometimes alongside other restraint sensor codes
Possible causes
- Damaged, corroded or loose wiring or connector on the right side restraint sensor circuitlikely
- Faulty right side restraint sensor (for example a crash or acceleration sensor)likely
- Previous repair, trim, seat or door work that disturbed or unplugged the sensor or its connectorpossible
- Sensor incorrectly fitted, loose mounting or bodywork damage from a previous impact affecting the sensorpossible
- Low or unstable battery or supply voltage causing a false fault to be storedpossible
- Faulty SRS control unit or an outdated or incorrect software or calibration, where the manufacturer has a known issue for that modelrare
How to diagnose
- Read all stored and pending codes in the SRS module and other modules, and note any freeze frame or status data, including whether the fault is current or history.
- Check the battery condition and charging voltage, as low voltage can set false restraint faults.
- Look up the sensor 4 location and circuit for the specific model, then visually inspect the sensor, its mounting and its wiring for damage, water ingress, corrosion or signs of previous repair.
- Check the connector is fully seated and its locking mechanism is intact. Use only manufacturer-approved procedures, with the battery disconnected and the correct waiting time observed, before touching any SRS connector.
- Do not probe airbag circuits or connectors with a test lamp or meter unless the manufacturer's procedure allows it. Follow the model-specific test steps for circuit resistance and sensor values.
- Check for any open recalls or service bulletins on the restraint system for that vehicle.
- After repair, clear the code, then confirm it does not return and the SRS warning light goes out and stays out.
How to fix
- Repair or replace damaged wiring or connector terminals on the sensor circuit, following manufacturer repair guidance.
- Replace the faulty right side restraint sensor with the correct part and refit it to the specified mounting and torque.
- Refit or correctly secure any connector or sensor disturbed by previous work.
- Restore correct battery condition and supply voltage if this triggered the fault.
- Repair any structural or mounting damage that affects the sensor position.
- Replace or update the SRS control unit software only if the manufacturer identifies it as a known cause, then carry out any required configuration.
Can I keep driving?
The car may still drive normally, but the airbag and restraint system could fail to work properly in a crash. Have it inspected and repaired as soon as possible, and avoid carrying passengers on the affected side if you can.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.