2015-2020 GLA45 AMG Combination Switch: Airbag Recall, Failure Symptoms, and Replacement Guide
This guide covers the critical steering column grounding recall, common failure symptoms, and how to choose the correct replacement combination switch for your 2015-2020 Mercedes-Benz GLA45 AMG.
- A critical safety recall exists for 2015-2017 models for improper steering column grounding that can lead to inadvertent airbag deployment. Verify this has been completed.
- Compatibility is crucial. You must match the replacement switch to your car's options, specifically whether it has Distronic (adaptive cruise control) or not. Visually check the cruise control stalk.
- Failure of the internal clockspring is common and will trigger SRS (airbag) and ESP (stability control) warning lights.
- Replacement is a DIY job for experienced mechanics but requires removing the airbag and may require a scan tool to calibrate the new steering angle sensor.
Vehicle-Specific Known Issues & Recalls
Safety Recall Notice: Many 2015-2017 GLA-Class vehicles, including the GLA45 AMG, were part of Mercedes-Benz recall campaign 2018030018. The issue involves insufficient electrical grounding of the steering column. In a rare combination of events where the internal clockspring is broken from wear and the unit is exposed to an electrostatic discharge, the driver's airbag could deploy inadvertently. The official remedy involves a dealer installing a sufficient ground to the steering column and adding a protective ring to the module. It is critical to verify if this recall has been performed on any vehicle before purchasing or working on the steering column.
Another recall affecting 2017-2018 GLA45 AMG models involves the steering shaft itself, where a universal joint could fail and cause a loss of steering control. While not a part of the combination switch, it highlights the importance of inspecting all steering components during a repair.
Symptoms of Failure
A failing combination switch can cause a wide range of confusing electrical issues. Because it controls so many functions, symptoms can appear unrelated at first. Here are the most common signs that your switch is failing:
- Turn Signal Problems: Signals may not activate, may not cancel after a turn, or may flash intermittently. This is often the first sign of wear.
- Wiper and Washer Malfunctions: The wipers may not turn on, may only work on one speed, or may not respond to commands.
- Headlight and High Beam Issues: Inability to switch between high and low beams, or headlights that flicker or won't turn on at all.
- Warning Lights on the Dashboard: A broken internal clockspring is a very common failure and will almost always trigger an SRS (airbag) warning light. It will also likely cause the ESP (Electronic Stability Program) or traction control light to illuminate because the steering angle sensor can no longer report the wheel's position.
- Horn Not Working: The horn's electrical connection runs through the clockspring, so a failure here can disable the horn.
- Cruise Control Failure: The buttons for cruise control may become unresponsive.
- Physical Feel: The stalks may feel loose, require excessive force, or make grinding or clicking sounds when used.
Pro Tip: On some modern Mercedes vehicles, strange electrical issues in the steering column can be caused by a weak or failing main battery. A voltage drop during startup can confuse the sensitive electronics in the module, triggering fault codes. Before assuming the switch itself is bad, ensure your battery is healthy and fully charged.
Buying a Used Combination Switch
Purchasing a used OEM combination switch is a great way to save money, but careful verification is essential. These modules are highly specific to the vehicle's factory-installed options. An incorrect part will not work and may cause further electrical issues.
How to Ensure Compatibility
Warning: The most critical compatibility factor is the type of cruise control your vehicle has. The internal electronics for standard cruise control are different from those for Distronic Plus (Adaptive Cruise Control). You cannot swap them. You must match the switch to your vehicle's options.
- Match the Part Number Exactly: Start by matching the OEM part number from your original switch. Known numbers include A2469006520 and A24690065209051. However, part numbers can supersede, so visual confirmation is the most important step.
- Visually Inspect the Stalks: This is the best way to confirm compatibility. Look at the cruise control stalk on the switch you plan to buy.
- A switch for a car WITH Distronic Plus will have a small rotating wheel on the end of the cruise control stalk. This wheel is used to adjust the following distance to the car ahead.
- A switch for a car WITHOUT Distronic Plus will have a simple stalk with no rotating wheel.
- Check for Lane Keep Assist: Some switches also have different internal electronics based on whether the car is equipped with Lane Keep Assist (Option Code 476). While harder to verify visually, matching the part number and Distronic function is the most reliable method.
Physical Inspection
- Check the Stalks: Ensure all stalks move smoothly without excessive play and click into their positions correctly.
- Inspect the Clockspring Ribbon: Look at the yellow electrical connector for the clockspring. Ensure the ribbon cable is not torn, creased, or damaged. The clockspring is a wear item, and a used part carries some risk, but a visually intact OEM unit is often more reliable than a cheap new aftermarket part.
- Examine Connectors: Check all electrical pins for signs of corrosion, especially if the part came from a region with high humidity. Water damage can cause module failure.
- Mileage: Lower mileage is always better, as the clockspring ribbon and mechanical contacts have a finite lifespan. Aim for a part from a vehicle with under 100,000 miles if possible.
Cost Comparison
Prices can vary based on condition and supplier. The estimates below are for the complete combination switch assembly, including the clockspring.
| Part Type | Estimated Price Range | Notes |
|---|---|---|
| New OEM (Dealer) | $420 - $500 | Price for a similar, newer generation part. Guarantees compatibility and comes with a warranty. |
| Used OEM (Recycled) | $100 - $250 | Best value, but requires careful inspection and compatibility verification. |
| New Aftermarket | Not Generally Available | Due to the complexity and safety integration (airbag/ESP), quality aftermarket replacements for this specific part are not common. |
| Remanufactured / Repair Service | $150 - $200 | Some specialists offer a repair service for your existing clockspring, which can be a cost-effective option if that is the only point of failure. |
| Shop Labor | $100 - $150 | Typically 1-1.5 hours of labor. |
Installation Guide
Replacing the combination switch is a moderately difficult job that involves handling a sensitive safety component (the airbag).
- Difficulty: 4 out of 5
- Estimated Time: 1.5 - 2 hours
- DIY Feasible: Yes, for experienced mechanics comfortable with airbag removal.
Warning: The driver's airbag must be removed to perform this repair. Improper handling can lead to accidental deployment and serious injury. Always disconnect the vehicle's battery and wait at least 15 minutes for the system to discharge before beginning work.
Key Replacement Steps
- Disconnect the Battery: This is a mandatory first step for safety.
- Remove the Airbag Module: From behind the steering wheel, use a T30 Torx driver to loosen the two bolts holding the airbag module. Gently pull the airbag out and disconnect the electrical connectors. Pry up the orange locking tabs before pulling the connectors straight out.
- Remove the Steering Wheel: Ensure the front wheels are pointing straight ahead. Use a large socket (often a 10mm Allen) to remove the center bolt. An impact wrench is very helpful here. Mark the position of the wheel relative to the shaft before removing it.
- Remove the Clockspring/Combination Switch Assembly: The assembly is typically held on by a few Torx screws. It may have plastic tabs that need to be carefully released. Disconnect the main electrical harness from the back.
- Install the New Unit: Before installing the new switch, ensure the clockspring is centered. Used parts should come with a locking tab to keep them centered; do not remove it until the switch is installed. Install the new switch, reconnect the steering wheel (aligning your marks), torque the center bolt, and reinstall the airbag.
Post-Installation Calibration
After replacing the switch or disconnecting the battery, the Steering Angle Sensor (SAS) will likely need to be reset. An uncalibrated sensor will keep the ESP/traction control warning light on.
- Simple Method: Start the engine. Turn the steering wheel all the way to the left lock, then all the way to the right lock, and finally return it to the center. Driving for a few minutes may clear the light.
- Scan Tool Method (Recommended): The proper method is to use a Mercedes-compatible diagnostic scan tool to perform the Steering Angle Sensor calibration. This procedure zeroes the sensor's position and ensures the ESP system functions correctly. This is required if the simple method does not work.
Frequently Asked Questions (FAQ)
Can I drive with a bad combination switch?
It is not recommended. A faulty switch can leave you without turn signals, wipers, or headlights, which is a major safety hazard and illegal in most places. If the SRS/airbag light is on, it means the driver's airbag may not deploy in a crash, making it unsafe to drive.
What is the difference between the combination switch and the clockspring?
The combination switch is the entire assembly with the stalks you use. The clockspring (also called a squib) is a component inside that assembly. It's a flat, coiled ribbon of wires that allows the airbag and steering wheel buttons to stay connected while the wheel turns. On this vehicle, they are replaced as a single unit.
Does a replacement combination switch need to be programmed?
Generally, the switch itself does not require programming (SCN coding) if you install the correct part for your vehicle's options. However, as mentioned above, you will need to perform a steering angle sensor calibration/reset, which may require a diagnostic scan tool.
My scanner shows fault code C220564. Is my sensor definitely bad?
Not necessarily. On some 2020 and newer Mercedes models, code C220564 can be a "ghost code" caused by a software glitch during vehicle startup. The module reports an internal fault even when none exists. If there are no other warning lights (like ESP) and no other related fault codes, the factory guidance is often to simply clear the code. A true failure is more likely if you also have an SRS light or other communication codes stored.
Technical Specifications
OEM Part Numbers: 2469006520 A2469006520 A24690065209051
Houses turn signal, wiper, cruise control, and high beam switches. Integrates the steering angle sensor (SAS) and the driver's airbag clockspring (SRS).
We Have This Part in Stock
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 GLA45 AMG: