2021 BMW 330i Dual Storage System Fault TSB 10184583

Symptoms

Owners of affected BMW vehicles may notice a fault indication in their vehicle's electrical system. This occurs specifically when the two-battery Dual Storage System (DSS) is designed to disconnect from the electrical system following an accident. If the internal relay within the DSS becomes stuck closed, it causes "a fault is set" condition.

Diagnosis and Trigger Conditions

This particular issue, identified in BMW TSB 10184583, is triggered specifically in the event of an accident. The Dual Storage System (DSS) is designed to isolate itself from the vehicle's main electrical system via an internal relay for safety. However, in some cases, this relay can fail to open and remain stuck closed, leading to the fault.

Repair Procedure Summary

To address the 2021 BMW 330i Dual Storage System fault, BMW has issued instructions for technicians to check the Dual Storage System (DSS). If the system is found to be faulty, it must be replaced. This ensures the proper functioning of the electrical system's safety features after an accident.

Owner Action

If you own a 2021 BMW 330i or another affected model and have been involved in an accident, or if you suspect a 2021 BMW 330i Dual Storage System fault, it is recommended to contact an authorized BMW dealer. They can perform the necessary diagnostic checks and repairs as outlined in Technical Service Bulletin (TSB) 10184583.

Source: NHTSA ID: 10184583