AutoFixDB - Free OBD-II diagnostic trouble code lookup. Find causes, symptoms, diagnostic steps and repair solutions.

Overview

B009E diagnostic trouble code refers to a fault with right side restraints sensor 5 in the vehicle’s occupant restraint/airbag system, typically involving the passenger seat weight sensor or associated wiring.

Common Symptoms

Airbag/occupant restraint warning light illuminated
Passenger airbag may not deploy correctly
Seat belt warning chime or message related to passenger seat

Most Common Causes

Faulty passenger seat weight/occupant restraint sensor medium

Common in body/airbag systems where the seat sensor fails or reads incorrectly.

Damaged or corroded wiring/connectors in the restraint system medium

Wiring harness issues can disrupt sensor communication with the airbag control module.

Faulty airbag/occupant restraint control module low

Less common but can trigger subfault readings if the control module misinterprets sensor input.

Diagnostic Steps

Connect an OBD-II scanner capable of reading body/airbag codes and confirm presence of B009E.

Expected: Code B009E stored with possibly related airbag/resraint codes.

Interpretation: Confirms fault is present and relates to restraint system sensor.
Visually inspect wiring and connectors for the passenger seat weight/occupant restraint sensor.

Expected: No frayed wires, corrosion, or loose connectors.

Interpretation: If wiring/connectors are damaged, repair and retest.
Test the sensor and circuit with a multimeter per manufacturer data.

Expected: Proper resistance/voltage values per spec.

Interpretation: Out-of-spec values point to a faulty sensor or circuit issue.
If wiring and sensor are good, test or scan the airbag/occupant restraint control module.

Expected: Control module functions normally with no internal errors.

Interpretation: Faulty module may need replacement if it cannot reliably process sensor signals.

Repair Solutions

Replace faulty passenger seat weight/occupant restraint sensor medium

Estimated Cost: $200 - $400

Typical repair cost range for sensor replacement including labor.

Repair or replace damaged wiring/connectors medium

Estimated Cost: $150 - $300

Costs vary by extent of wiring harness damage.

Replace airbag/occupant restraint control module hard

Estimated Cost: $500 - $800

Higher cost repair, often requires calibration and professional service.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

Assuming code relates to engine performance rather than occupant restraint system

Frequently Asked Questions

Technical definition of B009E OBD-II Code

The B009E code stands for Right Side Restraints Sensor 5 (Subfault). This generally indicates an issue with the Sensors system.

Should I stop driving if I have B009E?

With a severity level of high, may not directly affect engine drivability but can disable/passenger airbag deployment and trigger safety warnings.

What are the symptoms of B009E?

The most typical signs are: Airbag/occupant restraint warning light illuminated, Passenger airbag may not deploy correctly, Seat belt warning chime or message related to passenger seat.

Common triggers for the B009E error

This code is frequently triggered by: Faulty passenger seat weight/occupant restraint sensor, Damaged or corroded wiring/connectors in the restraint system, Faulty airbag/occupant restraint control module.

Estimated repair costs for different causes of B009E

It depends on what needs to be fixed. Repair or replace damaged wiring/connectors repairs are cheaper (~$300), while Replace airbag/occupant restraint control module repairs are on the higher end (~$800).

Does code B009E apply to Mercedes vehicles?

The B009E code is a generic powertrain code, meaning it applies to almost all makes and models, such as Honda, Toyota, VW, Ford, and Chevy.

B009E: Right Side Restraints Sensor 5 (Subfault)