The B0079 diagnostic trouble code (DTC) indicates an issue with the Side Impact Sensor (SIS) on the left front (driver's side) of a vehicle. Specifically, it means the vehicle's computer has detected that an incorrect or incompatible SIS unit has been installed. Addressing this code promptly is crucial to ensure the proper functioning of the vehicle's safety systems, particularly the airbags, in the event of a side collision.
This code doesn't necessarily mean the sensor is defective; it signifies a mismatch that could prevent the airbag system from deploying correctly, potentially leading to serious injury during an accident. Proper diagnosis and replacement with the correct SIS unit are paramount.
| Topic | Description | Potential Causes |
|---|---|---|
| Definition of B0079 | Diagnostic Trouble Code indicating an incorrect Side Impact Sensor (SIS) installed on the left front (driver's side) of the vehicle. | Incorrect part number SIS installed; SIS programmed with incorrect VIN; Wiring harness damage/corrosion; Faulty ECM/BCM; Damaged connector to SIS; Aftermarket SIS installation without proper programming. |
| Function of Side Impact Sensors | Detect lateral acceleration during a side impact collision and transmit a signal to the airbag control module (ACM) to deploy the side airbags. | Failure to deploy side airbags in a side impact collision; Unnecessary deployment of side airbags; Incorrect airbag deployment timing; Compromised occupant safety in a side impact collision. |
| Common Symptoms | Airbag warning light illuminated; Diagnostic trouble code B0079 present; Potential airbag system malfunction; Potential restriction on other safety system functionality. | Airbag warning light remains on despite troubleshooting; Difficulty clearing the B0079 code; Erratic airbag system behavior; Other related DTCs related to the airbag system. |
| Diagnostic Steps | Verify the DTC; Inspect the SIS part number; Check wiring and connectors; Test the SIS circuit; Consult vehicle-specific service information; Use scan tool to read sensor data. | Misdiagnosis due to incorrect interpretation of the DTC; Overlooking wiring issues; Failure to identify the correct SIS part number; Ignoring vehicle-specific service procedures; Improper use of diagnostic tools. |
| Potential Solutions | Replace with the correct SIS unit; Repair or replace damaged wiring/connectors; Reprogram the SIS (if applicable); Clear the DTC; Verify system functionality. | Using an incorrect replacement SIS; Improper wiring repairs; Failure to properly reprogram the SIS; Incomplete DTC clearing; Neglecting to verify the system's correct operation after repairs. |
| Related DTCs | B0070-B0078 (related to other SIS issues); DTCs related to the Airbag Control Module (ACM); DTCs related to the Supplemental Restraint System (SRS). | Incomplete diagnosis due to overlooking related DTCs; Misinterpretation of the overall airbag system status; Failure to address underlying issues affecting multiple components. |
| Tools Required | Scan tool; Multimeter; Wiring diagram; Vehicle-specific service manual; Socket set; Screwdrivers; Connector cleaning tools. | Incorrect diagnosis due to using inadequate tools; Damage to components due to improper tool usage; Inefficient troubleshooting due to lack of proper tools. |
Detailed Explanations
Definition of B0079: The B0079 code signals that the Electronic Control Module (ECM) or Body Control Module (BCM) has detected a discrepancy between the expected and the actual Side Impact Sensor installed on the driver's side. This can be due to an incorrect part number or a failure in the SIS's programming to match the vehicle's VIN.
Function of Side Impact Sensors: Side Impact Sensors are crucial components of the Supplemental Restraint System (SRS), designed to detect the severity and location of a side impact. Upon detecting a collision, these sensors send a signal to the Airbag Control Module (ACM), which then determines whether to deploy the side airbags to protect the occupants. A faulty or incorrect SIS can prevent or delay airbag deployment, increasing the risk of injury.
Common Symptoms: The most common symptom associated with the B0079 code is the illumination of the airbag warning light on the dashboard. This light serves as an indicator that there's a problem within the SRS. Other potential symptoms include difficulty clearing the DTC, erratic behavior of the airbag system, and the presence of other related DTCs.
Diagnostic Steps: Diagnosing the B0079 code involves a systematic approach. First, verify the presence of the DTC using a scan tool. Then, physically inspect the SIS unit to ensure it has the correct part number for the vehicle. Check the wiring and connectors for any signs of damage or corrosion. Use a multimeter to test the SIS circuit for continuity and proper voltage. Consult vehicle-specific service information for detailed troubleshooting procedures and wiring diagrams.
Potential Solutions: The most common solution for the B0079 code is to replace the incorrect SIS unit with the correct one. If the wiring or connectors are damaged, repair or replace them as needed. In some cases, the SIS may need to be reprogrammed to match the vehicle's VIN. After completing any repairs, clear the DTC and verify that the system is functioning correctly.
Related DTCs: Understanding related DTCs is crucial for a comprehensive diagnosis. Codes within the B0070-B0078 range often indicate problems with other Side Impact Sensors. DTCs related to the Airbag Control Module (ACM) or the Supplemental Restraint System (SRS) can provide further insight into the overall health of the safety system.
Tools Required: Diagnosing and resolving the B0079 code requires a variety of tools. A scan tool is essential for reading and clearing DTCs. A multimeter is needed to test circuit continuity and voltage. Wiring diagrams and vehicle-specific service manuals are invaluable for identifying the correct SIS part number and understanding the wiring configuration. A socket set, screwdrivers, and connector cleaning tools may also be necessary.
Frequently Asked Questions
What does the B0079 code mean? It means the vehicle's computer has detected an incorrect Side Impact Sensor (SIS) on the driver's side. This could be due to an incorrect part number or a programming mismatch.
Can I drive with the airbag light on? It's not recommended. The airbag system may not function properly in an accident, increasing the risk of injury.
How do I find the correct SIS part number? Consult your vehicle's service manual, or contact your dealer with your VIN. They can provide the correct part number for your specific vehicle.
Can I replace the SIS myself? While possible, it's recommended to have a qualified technician perform the replacement due to the complexity of the airbag system. Improper installation can lead to system malfunction and potential injury.
Will clearing the code fix the problem? Clearing the code will only temporarily remove the warning light. The underlying problem must be addressed for the code to stay cleared.
How much does it cost to fix a B0079 code? The cost can vary depending on the price of the SIS unit, labor costs, and any necessary wiring repairs. It's best to get an estimate from a qualified mechanic.
Do I need to reprogram the new SIS? Some SIS units may require programming to match the vehicle's VIN. Consult the service manual or the SIS manufacturer's instructions.
What happens if I ignore the B0079 code? The airbag system may not function correctly in a side impact collision, potentially leading to serious injury. It's crucial to address the issue promptly.
Conclusion
The B0079 diagnostic trouble code signifies a critical issue within the vehicle's safety system. Promptly addressing this code is essential to guarantee the proper functionality of the side airbags in the event of a collision. Always consult a qualified technician for proper diagnosis and repair.