2013-2019 Mercedes B250 Column Switch: Airbag Recall, Failure Symptoms, and Replacement Guide
This guide covers the critical airbag recall, common electronic failures, and essential compatibility checks for the 2013-2019 Mercedes-Benz B250 steering column module.
- A critical safety recall exists for insufficient grounding that can cause the airbag to deploy unexpectedly; verify your VIN with NHTSA or a dealer.
- You must match the OEM part number from your old unit exactly. Options like Lane Keep Assist (Code 476) change the part number and are not interchangeable.
- After replacement, the Steering Angle Sensor (SAS) inside the new module MUST be calibrated with a professional scan tool to prevent ESP/ABS errors.
- Failure symptoms are often electronic, including SRS and ESP warning lights, not just a broken stalk.
Urgent Safety Recall: Insufficient Steering Column Grounding
Warning: Many 2014-2018 Mercedes-Benz vehicles, including the B250 (W246 platform), were part of a major safety recall for insufficient electrical grounding in the steering column. In rare cases, an electrostatic discharge combined with a worn or broken internal clock spring could cause the driver's airbag to deploy unexpectedly, creating a significant risk of injury.
The official recall notice (NHTSA Campaign numbers include 2017110013 and others) states that the condition is preceded by an SRS/airbag warning light on the dashboard, which indicates a broken clock spring. The fix, performed by a Mercedes-Benz dealer, involves adding a grounding bridge and a protective ring to the steering column module to ensure it is properly grounded.
Before purchasing a used column switch or diagnosing your existing one, it is critical to check with a Mercedes-Benz dealer or use the NHTSA VIN lookup tool to see if your vehicle was affected by this recall and if the remedy has been performed.
Symptoms of a Failing B250 Column Switch
Because this is an electronic module, symptoms often go beyond a simple mechanical failure and can trigger warning lights for seemingly unrelated systems.
Electronic Failures & Warning Lights
- SRS / Airbag Warning Light: This is a serious symptom. It often indicates the internal clock spring has broken. Due to the grounding recall, a broken clock spring elevates the risk of inadvertent airbag deployment. Do not drive the vehicle and seek immediate service.
- ESP / ABS / Traction Control Lights: These lights indicate a problem with the Steering Angle Sensor (SAS) housed within the column module. The car's stability system doesn't know which way the wheels are pointed and will disable itself as a precaution.
- Functions Not Working: Intermittent or total failure of the turn signals, windshield wipers, high beams, or cruise control functions controlled by the stalks.
Mechanical & Other Symptoms
- Turn Signal Won't Cancel or Stay On: The mechanical part of the stalk may be worn, preventing it from latching in place or canceling after a turn.
- Loose or Wobbly Stalks: The physical stalks may feel loose or have excessive play.
- Clicking or Grinding Noises: Unusual noises when turning the steering wheel could point to a problem with the clock spring or internal bearings.
Buying a Used B250 Column Switch: Your Pre-Purchase Checklist
Purchasing a used OEM steering column module is a great way to save money, but it requires careful verification to avoid buying an incompatible or unsafe part. The complexity of this module means cheap aftermarket versions are not recommended, as they can cause persistent electronic errors.
1. Match The Part Number Exactly
This is the most important rule. Mercedes used dozens of different part numbers for this module, even within the same vehicle model and year. Variations depend on specific vehicle options. The part number is printed on a white sticker on the module's housing. You must remove your old module to read the number and buy a used one with the identical number.
2. The Lane Keep Assist Trap (Option Code 476)
Warning: One of the most common variations is for vehicles with or without Lane Keep Assist (Mercedes option code 476). A module for a car with this feature will not work correctly in a car without it, and vice-versa. You can check your vehicle's original equipment list using a VIN decoder or by looking for the Lane Keep Assist activation button on the end of the turn signal stalk.
3. Physical Inspection Checklist
- Check Connectors: Ensure all electrical connector pins are straight and free of corrosion.
- Inspect Stalks: The stalks should click into place firmly. Markings for wipers and lights should be clear and not worn away.
- Look for the Lock Tab: The central rotating part (the clock spring) should have a small plastic lock tab in place to prevent it from spinning during shipping. If it has been spun freely, the delicate ribbon cable inside may be damaged.
- Ask About the Donor Vehicle: If possible, find out if the donor vehicle had any SRS or ESP warning lights on. Avoid any module from a vehicle with active electronic fault codes.
Cost Comparison: B250 Column Switch
| Part Type | Estimated Cost | Notes |
|---|---|---|
| New OEM | $350 - $550 | Price varies significantly by part number and features. Sourced from a Mercedes-Benz dealer. |
| Used OEM | $100 - $250 | Offers best value, but requires exact part number matching. |
| New Aftermarket | $150 - $300 | Not recommended due to potential for electronic incompatibility and triggering fault codes. |
| Shop Labor | $150 - $350 | Typically 1.5-2.5 hours of labor. Includes steering wheel/airbag removal and post-installation calibration. |
Replacement Overview & Calibration
Replacing the steering column module is a moderately difficult job that requires careful handling of the airbag system and a critical final calibration step.
- Difficulty: 3 out of 5
- Estimated Time: 1.5 - 2.5 hours
- Tools Required: Torx bit set (T10, T30), 10mm hex bit socket, breaker bar, trim removal tools, torque wrench.
Abbreviated Replacement Steps
- Disconnect the battery and wait at least 15 minutes for the airbag system to discharge.
- Remove the two T30 Torx bolts from the back of the steering wheel to release the airbag module.
- Carefully disconnect the airbag connectors and set the airbag aside, face up.
- Use a 10mm hex bit and a breaker bar to remove the center steering wheel bolt. Do not rely on the steering lock to hold the wheel; have a helper hold it or brace it.
- Mark the steering wheel's position relative to the column spline before removing it.
- Remove the old column module, swap over any necessary components, and install the new module.
- Reassemble in reverse order, making sure to torque the steering wheel bolt to specification.
Pro Tip: The new module's clock spring must be centered. It is usually shipped with a locking tab to keep it in position. Do not remove this tab until the module is installed and you are ready to mount the steering wheel. If the clock spring is rotated by a full turn, it will break when you turn the steering wheel lock-to-lock, triggering an SRS light.
Crucial Final Step: Steering Angle Sensor (SAS) Calibration
After the new module is installed, the car's computer must be taught the new sensor's center position. Failure to perform this step will result in ESP, ABS, and other warning lights, and the stability control system will not function correctly. This calibration requires a Mercedes-specific diagnostic tool (like XENTRY/STAR) or a high-end professional scan tool that supports this function. A simple DIY battery disconnect or turning the wheel lock-to-lock is often not sufficient for a new module installation.
Frequently Asked Questions (FAQ)
Why is my ESP/ABS light on after replacing the column switch?
Your ESP/ABS light is on because the Steering Angle Sensor (SAS) inside the new column module has not been calibrated. The stability control system doesn't know where the 'straight-ahead' position is and has disabled itself for safety. You must have the sensor calibrated using a compatible professional scan tool.
Can I just replace the broken turn signal stalk?
No, on the B250 the individual stalks are not typically sold separately. They are integrated into the complete steering column module assembly. The entire unit must be replaced.
How do I know if my B250 has Lane Keep Assist (Option Code 476)?
The easiest way to check is to look at the end of your turn signal stalk. If your car has Lane Keep Assist, there will be a button on the end with an icon of a car between two dotted lines. You can also use an online VIN decoder that lists factory option codes for your specific vehicle.
What is the airbag recall and how do I check if it's been done?
The recall addresses an insufficient grounding issue that could, in combination with a broken clock spring, cause the driver's airbag to deploy unexpectedly. You can check if your vehicle is affected and if the repair has been completed by entering your VIN on the official NHTSA website (nhtsa.gov/recalls) or by calling any Mercedes-Benz dealership service department.
Can I use a column switch from a CLA-Class or GLA-Class?
Possibly, but it is very risky. The B-Class (W246), CLA-Class (C117), and GLA-Class (X156) share the same MFA1 platform and many parts, including being part of the same grounding recall. However, there are still many variations. The only way to guarantee compatibility is to match the OEM part number from your original unit exactly.
Technical Specifications
OEM Part Numbers: 24690002209051 2469001311 24690013119051 24690037149051 2469003803 24690040209051 24690044099051 2469004920 24690049209051 2469005320 2469006720 24690067209051 2469007509 2469007906 24690090179051
Integrates turn signal, wiper, and cruise control switches, clock spring (for airbag), and Steering Angle Sensor (for ESP). Variations exist based on options like Lane Keep Assist (Code 476) and Adaptive Cruise Control.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Mercedes-Benz B250:
- Urgent Safety Recall: Insufficient Steering Column Grounding
- Symptoms of a Failing B250 Column Switch
- Electronic Failures & Warning Lights
- Mechanical & Other Symptoms
- Buying a Used B250 Column Switch: Your Pre-Purchase Checklist
- 1. Match The Part Number Exactly
- 2. The Lane Keep Assist Trap (Option Code 476)
- 3. Physical Inspection Checklist
- Cost Comparison: B250 Column Switch
- Replacement Overview & Calibration
- Abbreviated Replacement Steps
- Crucial Final Step: Steering Angle Sensor (SAS) Calibration
- Frequently Asked Questions (FAQ)
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