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If the control module fails, it can prevent the system from functioning properly.

Control Module Failure: The control module is the electronic component that manages the SOS call system.If there is an error in the programming, it can cause the system to malfunction. Programming Glitch: The SOS call system is a complex system controlled by software.On the downside, if one component fails, all other devices within the loop will be disconnected. This improves signal quality and reduces interference. What Causes BMW SOS Call System Malfunction?Īll units, such as amplifiers, SOS modules, or head-unit, are connected with an optic cable in one loop. Warning chimes might be disabled as well. In some models, the iDrive system will not respond to any commands. When the SOS call system fails, it will warn the driver with a crossed-out SOS call malfunction warning light on the dashboard.