Mercedes-Benz GLB Ignition Switch Replacement Parts

The GLB, which launched in 2019, uses a keyless push-button start system rather than a traditional barrel-style ignition switch — so there is no conventional ignition switch fitted to any variant of this model. What you may actually be looking for is the start/stop button, the steering column electronic module, or the EIS (Electronic Ignition Switch) unit, which is the electronic control module that handles the ignition function on Mercedes-Benz vehicles of this generation. Searching for those terms when requesting quotes from breakers is likely to get you much closer to the part you need.

The GLB X247 is the only generation, running from 2019 onwards, with a mid-life refresh arriving around 2023 — and whether the EIS module is interchangeable across that facelift boundary is something you should confirm with the breaker against your exact registration, as software and coding differences can affect compatibility even when parts look identical. Because Mercedes EIS units are often paired to the vehicle's keys and ECU, a used unit will almost certainly require coding to your car regardless of which year it comes from. Always make sure your breaker is aware of your full registration so they can cross-reference the part number.

Trim level — whether Sport, AMG Line, or AMG Line Premium — does not affect which electronic ignition components the GLB uses, so you do not need to restrict your search to the same trim. You may find minor cosmetic differences in the appearance of the start/stop button surround or fascia, but the functional components are trim-independent. Confirm the specific part number with your breaker against your registration to be sure.

Mercedes-Benz does use shared EIS architecture across some of its model ranges, and there is a possibility of crossover compatibility, but this is not something that can be stated as a general rule — differences in software versions, chassis coding, and model-specific configurations mean you must check the exact part number with the breaker rather than assume it will work. Because EIS units require programming to the recipient vehicle, even a compatible unit from another model will need specialist coding. Route this question to the breaker with both registrations for a reliable answer.

A used EIS unit from a GLB will not simply plug in and work without coding, as Mercedes security systems pair the module to the vehicle's keys and other control units — fitting without coding can leave the car immobilised. You will need a Mercedes-specialist workshop or someone with the appropriate diagnostic equipment to program the replacement unit to your car. Make sure the breaker can supply the unit's part number so your fitting specialist can confirm compatibility before you commit to the purchase.