Airbags

B009D — Right Side Restraints Sensor 4 Fault (Subfault)

Severity: medium Safe to drive

What B009D means

The airbag (SRS) control module continuously monitors crash and restraint sensors placed around the body. B009D means a fault was found for right side restraints sensor 4, such as a missing or out-of-range signal, or an open or shorted circuit. While it is active, part of the restraint system may be disabled or may not deploy when needed.

Symptoms

  • Airbag (SRS) warning light is on
  • Safety restraint system fault message in the instrument cluster
  • Right side crash sensor may not work
  • Code returns after being cleared

Possible causes

  1. Damaged or corroded wiring or connector in the sensor circuit
  2. Faulty right side restraints/crash sensor 4
  3. Loose connector after body, seat or trim work
  4. Airbag control module failure (less common)

How to diagnose

  1. Scan all modules with a tool that supports SRS and note any freeze-frame data
  2. Ask about recent work: body repair, seat or trim removal, or a collision
  3. Inspect the right sensor and its mounting for deformation, corrosion or moisture
  4. Check the connector and harness for damage, corrosion and a secure fit
  5. Test the sensor circuit for opens, shorts to ground and voltage per the factory wiring diagram
  6. Compare sensor readings or resistance with manufacturer specs
  7. If wiring and sensor are good, test the SRS module and its power supply

Common fixes

  • Repair the harness or replace a damaged connector
  • Replace right side sensor 4 and confirm correct mounting
  • Clean or reseat the connector terminals
  • Replace or reprogram the SRS module if confirmed faulty
  • Clear codes and confirm the warning light stays off

Questions and answers

What does B009D mean?

The SRS module found a fault in the circuit or the unit itself for right side restraints sensor 4. Wiring, a connector or the sensor are the most common causes.

Is it safe to drive with B009D?

The car will drive normally, but crash protection may be reduced. Have it diagnosed soon.

Can I just clear the code?

Clearing only turns off the light for a while. If the cause remains, the code returns and the airbags stay in question.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.