DTC Code B0004 – What does this code mean?

<ul> <li><a href="/problems/airbag-light-is-on"><b>Air Bag Warning Light ON</b></a>: The airbag warning light illuminates on the dashboard, indicating a potential issue with the airbag system. This symptom is linked to the B0004 code, which pertains to the driver knee bolster deployment control. The light serves as a warning that the airbag system may not function properly in the event of a collision.</li> </ul>

<ul><li>The driver knee airbag may be faulty, leading to improper deployment or failure to deploy during a collision.</li><li>An open or shorted harness in the driver knee airbag can disrupt the electrical signals necessary for proper airbag function.</li><li>Poor electrical connections in the driver knee airbag circuit can cause intermittent or complete loss of communication, affecting deployment readiness.</li></ul>

<ul> <li><b>Initial Scan and Verification</b>: Use a diagnostic scanner to confirm the presence of DTC B0004. Verify if there are any additional codes that might be related to the airbag system.</li> <li><b>Visual Inspection</b>: Inspect the driver knee bolster area for any visible damage or signs of previous deployment. Check for loose connections or damaged wiring.</li> <li><b>Check Airbag Control Module</b>: Access the airbag control module and inspect for any signs of damage or corrosion. Ensure all connectors are securely attached.</li> <li><b>Test Wiring and Connectors</b>: Use a multimeter to test the continuity and resistance of the wiring and connectors related to the driver knee bolster deployment circuit. Look for any signs of short circuits or open circuits.</li> <li><b>Inspect Deployment Control Circuit</b>: Examine the deployment control circuit for any faults. Ensure that the circuit is receiving the correct voltage and signals from the airbag control module.</li> <li><b>Review Airbag System Software</b>: Check for any available software updates for the airbag system that might address known issues with the deployment control.</li> <li><b>Final Verification</b>: After repairs or replacements, clear the DTC and perform a test drive to ensure the code does not return and the airbag system functions correctly.</li></ul>

<p>The DTC B0004 indicates an issue with the <b>Driver Knee Bolster Deployment Control</b>. This is a <b>critical</b> safety concern as it directly affects the airbag system's ability to protect the driver in the event of a collision. <ul><li>Failure to address this issue can result in the airbag not deploying properly, increasing the risk of injury during an accident.</li></ul> Immediate attention is required to ensure driver safety.</p>