--- title: BMW SRS (Supplemental Restraint System)/Airbag Diagnostic Trouble Codes (DTCs) description: Comprehensive guide on BMW Airbag/SRS DTC codes including faults in airbag control modules, seat belts, impact sensors, and more. Learn how MyAirbags can repair or reset specific components to resolve airbag warning lights and ensure vehicle safety. --- [Skip to content](https://info.myairbags.com/kb/bmw-srs-supplemental-restraint-system/airbag-diagnostic-trouble-codes-dtcs#main-content) English Show submenu for translations ![logo (3)](https://info.myairbags.com/hs-fs/hubfs/logo%20(3).png?width=221&height=58&name=logo%20(3).png) Open main navigation Close main navigation - English Show submenu for translations - [Website](https://www.myairbags.com/) [Website](https://www.myairbags.com/) Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [MyAirbags FAQ's](https://info.myairbags.com/kb?hsLang=en) 2. [FAQs](https://info.myairbags.com/kb/faqs?hsLang=en) 3. [DTC Codes](https://info.myairbags.com/kb/faqs?hsLang=en#dtc-codes) # BMW SRS (Supplemental Restraint System)/Airbag Diagnostic Trouble Codes (DTCs) **BMW Airbag/SRS Diagnostic Trouble Codes (DTCs): Comprehensive Guide for Troubleshooting and Repair** For salvage rebuilders and technicians working on BMW vehicles with an illuminated airbag warning light, understanding the specific Diagnostic Trouble Codes (DTCs) is crucial. Below is a detailed guide covering common BMW SRS/Airbag DTC codes related to faulty or bad connections with various components such as the airbag control module, airbags, seat belts, impact sensors, collapsible steering column, and pyro fuses. Parts that **MyAirbags** can rebuild or service are noted accordingly. --- ### **Understanding BMW's SRS/Airbag System** BMW's Supplemental Restraint System (SRS) is a complex network designed to enhance passenger safety. It includes multiple sensors, modules, and actuators that must work seamlessly. Faults in any component can trigger DTCs and illuminate the airbag light. --- ### **Common Airbag Control Module Faults** **Code: 93B2** **Description:** Airbag Control Unit Internal Fault **Possible Causes:** Software corruption, hardware failure, moisture intrusion. **Solution:** **MyAirbags can reset and repair the airbag control module**, restoring it to proper working condition. **Code: 93C3** **Description:** Airbag Control Unit Fault **Possible Causes:** Internal errors, power supply issues, faulty connections. **Solution:** **MyAirbags can reset and repair the airbag control module**, addressing these internal errors. --- ### **Airbag Deployment Circuit Faults** **Code: 93AB** **Description:** Driver Airbag Stage 1 Resistance Too High **Possible Causes:** Faulty clock spring, damaged wiring, poor connections. **Note:** Airbag modules must be replaced; they cannot be repaired. **Code: 93AC** **Description:** Driver Airbag Stage 2 Resistance Too High **Possible Causes:** Similar issues as Stage 1. **Note:** Replacement of the airbag module is required. **Code: 93B1** **Description:** Passenger Airbag Resistance Too High **Possible Causes:** Faulty passenger airbag, wiring issues, connector problems. **Note:** Airbag modules need to be replaced; they are not serviceable. --- ### **Seat Belt Pretensioner Faults** **Code: 93B4** **Description:** Driver Seat Belt Tensioner Resistance Too High **Possible Causes:** Damaged pretensioner, wiring faults, connector issues. **Solution:** **MyAirbags can rebuild and repair seat belt pretensioners**, restoring them to functional condition. **Code: 93B5** **Description:** Passenger Seat Belt Tensioner Resistance Too High **Possible Causes:** Similar to the driver's side issues. **Solution:** **MyAirbags can rebuild and repair passenger seat belt pretensioners**. --- ### **Impact Sensor Issues** **Code: 93A8** **Description:** Driver's Side Airbag Sensor Fault **Possible Causes:** Sensor damage, wiring problems, mounting issues. **Recommendation:** Impact sensors typically need to be replaced; repair is not recommended. **Code: 93A9** **Description:** Passenger's Side Airbag Sensor Fault **Possible Causes:** Same as driver's side sensor faults. **Recommendation:** Replace the faulty sensor to ensure proper SRS functionality. --- ### **Collapsible Steering Column Faults** **Code: 93F9** **Description:** Steering Column Switch Cluster Fault **Possible Causes:** Faulty switch cluster, wiring issues, internal faults. **Recommendation:** May require replacement or professional repair; consult a BMW specialist. --- ### **Pyrotechnic Battery Disconnect (Pyro Fuse) Faults** **Code: 930B** **Description:** Battery Safety Terminal (BST) Fault **Possible Causes:** Activated BST due to collision, wiring issues, connector problems. **Solution:** **MyAirbags can repair or replace the Battery Safety Terminal (pyro fuse)**, restoring proper circuit function. --- ### **Additional Common Faults** **Code: 93C1** **Description:** Seat Occupancy Detector (Passenger Seat) Fault **Possible Causes:** Damaged sensor mat, faulty wiring, connector issues. **Recommendation:** May require sensor replacement or installation of a bypass module; consult with a professional. **Code: 93C7** **Description:** Instrument Cluster Communication Fault **Possible Causes:** Communication errors between modules, wiring faults. **Solution:** **MyAirbags can repair or reset the airbag control module**, helping to restore proper communication. --- ### **Troubleshooting Tips** - **Professional Diagnostics:** Use BMW-specific diagnostic tools like ISTA/D to accurately read and interpret fault codes. - **Visual Inspection:** Examine all related wiring, connectors, and components for signs of damage, corrosion, or disconnection. - **Safety First:** Always disconnect the battery and wait at least 15 minutes before working on the SRS to prevent accidental deployment. - **OEM Standards:** Replace non-repairable components with genuine BMW parts to maintain system integrity. --- ### **Recommendations for Salvage Rebuilders** 1. **Detailed Documentation:** Keep thorough records of all diagnostics, repairs, and parts used for accountability and future reference. 2. **Use of Professional Services:** For components like airbag control modules and seat belt pretensioners, **MyAirbags** offers reliable repair services that comply with safety standards. 3. **Compliance with Regulations:** Ensure all repairs meet local and federal safety regulations to guarantee the vehicle's roadworthiness. 4. **Continual Learning:** Stay updated on BMW's SRS technology advancements and recall notices to enhance repair quality. --- ### **Disclaimer** This guide provides general information and may not cover all possible DTCs or specific scenarios for every BMW model. Always refer to the manufacturer's service information or consult a qualified professional for accurate diagnostics and repair procedures. **MyAirbags** can assist with repairing and resetting certain SRS components, but it's crucial to ensure all repairs comply with safety standards and regulations. --- By familiarizing yourself with these common DTCs and understanding which components can be repaired or need replacement, you can effectively troubleshoot and resolve SRS issues in BMW vehicles. 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