Mercedes 48V Battery Repair & BMS Reset via OBD | Remote Online Service | No SCN - Plug & Play

FBS4 is a generation of Mercedes-Benz's electronic drive authorization system. It coordinates security-related components involved in vehicle start authorization, including the electronic ignition system and applicable electronic steering lock modules.

B225409 (B2254-09) indicates an electronic steering lock malfunction associated with a component fault. It may cause no ignition, no crank, or failure of the steering lock to release. ARMHEX offers remote repair for supported FBS4 ESL modules with this fault.

B225464 (B2254-64) indicates a steering lock malfunction associated with an implausible signal. It can occur when the FBS4 ESL does not report the expected operating status. Compatibility must be checked before repair.

Some FBS4 ESL modules reporting B225407 may qualify for remote repair. However, mechanical failures or damaged internal components may require physical repair. Send your diagnostic report and ESL part number for assessment.

Yes, ARMHEX offers OBD-based remote ESL/ELV repair for supported Mercedes FBS4 vehicles. However, the procedure requires more than simply connecting a diagnostic tool to the OBD port. You must also locate a specific wire behind the dashboard and connect the diagnostic line to it. Our technicians will guide you through the required connection during the remote session.

On supported applications, the repair may be performed through OBD by locating a wire behind the dashboard or by connecting directly to the installed ESL. Other applications may require access to or removal of the module for a direct bench connection.

We repair the customer's original FBS4 electronic steering lock. This service does not involve installing an ESL emulator or replacing the steering lock with another unit.

Common applications include W117, W156, W176, W177, W205, W207, W212, W218, W242, W246, W247, W447, W907, and W910. Compatibility depends on the actual FBS4 ESL hardware, part number, and fault condition.

Yes, supported W205 FBS4 ESL modules may qualify for remote repair, including units reporting B225409 or B225464. Send the VIN, ESL part number, and diagnostic report for confirmation.

ARMHEX offers remote repair assessment for supported Mercedes Sprinter W907 FBS4 ESL modules. The required repair method depends on the installed steering lock hardware and its communication status.

Common supported candidates include A0999004101, A0999008300, A0999008701, A0999009401, and A2129009825. Additional variants may be supported. Send a clear photo of the original ESL label for verification.

You need a Windows laptop, stable internet, a suitable vehicle or bench power, and a compatible diagnostic interface (Tactrix Open Port) and OBD connector to connect the lines to the ESL on the bench. ARMHEX will confirm the required equipment for your module before the session.

If the no-start condition is caused by a supported FBS4 ESL fault, remote repair may restore normal steering lock operation and allow the vehicle's start-authorization sequence to complete. Other causes of no ignition or no start must be diagnosed separately.

No, you don't need them.

Yes. The repair is performed on the original ESL rather than a replacement unit. Retaining the original module generally avoids replacement-unit personalization.

30 Minutes.

ARMHEX provides online FBS4 ESL repair support to compatible workshops and technicians worldwide. You do not need a local ARMHEX branch; the repair is performed remotely through your laptop and connected equipment.

Yes. Our remote repair service is designed for independent Mercedes repair shops, automotive locksmiths, ECU repair specialists, diagnostic technicians, and other automotive professionals with compatible equipment.

Please send the Mercedes model and year, VIN, a clear photo of the ESL label and part number, the diagnostic fault codes or scan report, and the diagnostic equipment available at your workshop. This helps us confirm the appropriate remote repair method.