DTC Code B1B73 – What does this code mean?
<p>The DTC code B1B73 indicates a failure in the Left Side Satellite Acceleration Sensor 2, located in the C-pillar area past the 2nd row doors. This sensor, powered by the Occupant Restraint Controller (ORC), performs self-tests every 10 ms and reports its status to the ORC. The code is triggered when the ORC detects a self-test failure within the sensor, and it remains latched for the entire ignition cycle or until cleared by a scan tool.</p>
Symptoms for Fault Code B1B73
<ul>
<li><b>Air Bag Warning Light ON</b>: The airbag warning light illuminates on the dashboard, indicating a potential issue with the airbag system. This is often linked to a malfunction in the left side satellite acceleration sensor 2.</li>
<li><b>Faulty Airbag Deployment</b>: In the event of a collision, the airbag system may not deploy correctly due to the internal fault in the left side satellite acceleration sensor 2.</li>
<li><b>Diagnostic Trouble Code (DTC) B1B73</b>: The vehicle's onboard diagnostics system detects an internal fault in the left side satellite acceleration sensor 2, triggering the B1B73 code.</li>
</ul>
Common Causes for Fault Code B1B73
<ul><li>The left side impact sensor 2 may be faulty, leading to incorrect readings or no signal.</li><li>An open or shorted harness in the left side impact sensor 2 can disrupt the signal transmission.</li><li>Poor electrical connections in the left side impact sensor 2 circuit can cause intermittent or no communication.</li><li>A malfunctioning occupant restraint controller (ORC) can fail to process the sensor data correctly.</li></ul>
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Troubleshooting for Fault Code B1B73
<ul>
<li><b>Initial Scan</b>: Use an OBD-II scanner to confirm the presence of DTC B1B73 and check for any additional related codes.</li>
<li><b>Visual Inspection</b>: Inspect the left side satellite acceleration sensor and its wiring for any visible damage, corrosion, or loose connections.</li>
<li><b>Check Power Supply</b>: Verify that the sensor is receiving the correct voltage and ground by using a multimeter to check the power supply and ground circuits.</li>
<li><b>Sensor Signal Test</b>: Use an oscilloscope to check the signal output from the sensor to ensure it is within the manufacturer's specified range.</li>
<li><b>Connector Inspection</b>: Inspect the sensor connector for any bent pins, corrosion, or poor connections that could affect the sensor's performance.</li>
<li><b>Replace Sensor</b>: If all previous steps are satisfactory, replace the left side satellite acceleration sensor and clear the DTC code. Re-test to ensure the issue is resolved.</li></ul>
Severity Description for Fault Code B1B73
<p>The DTC code B1B73 indicates an issue with the Left Side Satellite Acceleration Sensor 2. This sensor is crucial for the vehicle's airbag system. A malfunction can lead to improper airbag deployment during a collision, posing significant safety risks.</p><ul><li><b>Immediate Action:</b> Inspect and replace the faulty sensor immediately.</li><li><b>Potential Risks:</b> Delayed repair can result in airbag failure, increasing the risk of injury in an accident.</li></ul>
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