2021 Mercedes-Benz AMG GT Mercedes Me Activation Issue

Owners of the 2021 Mercedes-Benz AMG GT may encounter problems with their Mercedes me connect services, specifically the inability to activate them or receive remote status updates. This technical service bulletin (TSB L182.85-P-076799) addresses the underlying cause and provides a clear remedy for this telematics system malfunction.

Symptoms

If your 2021 Mercedes-Benz AMG GT is affected, you might observe one or more of the following symptoms related to the Mercedes me connect services:

• "The Mercedes me connect services cannot be activated."
• "The remote status data does not update."
• "Communication/information > Telematics service > Vehicle status and configuration > Remote vehicle status query > Incorrect display/message"
• "Communication/information > Telematics service > Vehicle status and configuration > Remote vehicle status query > Malfunction"
• "Communication/information > Telematics service > Vehicle status and configuration > Vehicle function programming > Programming not possible"
• "Communication/information > Telematics service > Vehicle status and configuration > Vehicle function programming > Malfunction"
• "Communication/information > Telematics service > Activation/deactivation > Telematics service cannot be activated/deactivated"
• "Communication/information > Telematics service > Activation/deactivation > Malfunction"

These messages indicate a failure in the vehicle's ability to properly communicate with Mercedes-Benz telematics servers, preventing essential remote functions from operating.

Cause of the Mercedes Me Activation Issue

The root cause of the Mercedes-Benz AMG GT Mercedes Me activation problem lies within the N112/9 control unit, also known as the HERMES control unit, which manages the vehicle's telematics services. This unit is essential for features like remote vehicle status queries and activation/deactivation of services. The TSB specifies that an error within this control unit leads to incorrect configuration.

Specifically, the HERMES control unit's internal log, under the "URL" tab, incorrectly stores the value "DEFAULT" for critical server addresses such as "atpServerUrl" and/or "rcsServerUrl". These incorrect default values prevent the telematics system from establishing proper communication with the Mercedes me connect servers, thus causing the Mercedes-Benz AMG GT Mercedes Me activation failure.

Repair Procedure Summary

To resolve the Mercedes-Benz AMG GT Mercedes Me activation issue, a specific procedure must be performed by a qualified Mercedes-Benz technician. The primary remedy involves a re-commissioning of the N112/9 HERMES control unit. This process is comprehensive and includes two key steps:

1. Software Update: The HERMES control unit will receive a software update to its current version. This update is designed to address the underlying software logic that allows the incorrect "DEFAULT" URL values to be stored.
2. New Coding: Following the software update, the control unit will undergo new coding. This coding ensures that the correct server URL values are properly configured and stored, overriding the problematic "DEFAULT" entries. The TSB confirms that this newly included coding will permanently rectify the fault.

Once these steps are completed, the HERMES control unit will function correctly, allowing Mercedes me connect services to be activated and remote status data to update as intended. Mercedes-Benz states that with the updated software and coding, this specific fault will not recur in the future.

Owner Action

If you are experiencing any of the symptoms related to the Mercedes-Benz AMG GT Mercedes Me activation issue, it is recommended to schedule an appointment with an authorized Mercedes-Benz dealership. The repair involves specialized software updates and coding that can only be performed by trained technicians using Mercedes-Benz diagnostic equipment. Referencing TSB L182.85-P-076799 (Function group 82.85) can help ensure the technicians are aware of the specific bulletin for this concern. The damage code associated with this repair is 8209Z.

Source: NHTSA ID 10241790