What it means
The restraint control module monitors right-side restraints sensor 4 for crash-related input. It sets this code when it detects a fault in the sensor or its electrical circuit; the title alone does not identify the specific failure.
At a glance
- Usually lights the airbag (SRS) or body-system warning light
How it works
Right side restraints sensor 4 sends lateral crash information to the restraint control module for side-impact protection. B009D sets when the module detects a fault in this specific sensor or its circuit, though the code does not name the failed part.
Common causes
Most likely first.
- Faulty right-side restraints sensor 4
- Damaged wiring or connector at the sensor
- Loose or corroded electrical connection
- Fault in the restraint control module
Symptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
How to diagnose it
- Scan the SRS module to confirm B009D and review current status and any stored event data.
- Locate right side sensor 4 using vehicle service information and inspect its mounting area for damage, looseness, or recent disturbance.
- Disable the SRS according to the manufacturer's procedure, then inspect the sensor 4 connector and nearby wiring for corrosion, pin damage, poor seating, or chafing.
- Test the right side sensor 4 circuit for opens, shorts, and poor connections using the correct wiring diagram and specified method.
- If the circuit passes, test sensor 4 and the restraint control module input according to manufacturer instructions.
Common fixes
- Reconnect and secure the right side sensor 4 connector.
- Repair damaged wiring or corroded terminals in the sensor 4 circuit.
- Correct a loose or damaged sensor mounting area.
- Replace right side restraints sensor 4 if it fails the specified test.
- Repair the restraint control module only if its input fails after circuit checks.
Can I keep driving?
Right-side restraints associated with sensor 4 may not work as intended during a crash. Have the SRS diagnosed promptly and do not disturb its wiring without following the manufacturer's safety procedure.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.