Why is there a warning light on my BMW alternator?
In most cases, a failing alternator’s early stages will cause these warning lights and messages to come on just for a few seconds and then turn off. One of the most common problems that can cause a BMW battery or alternator warning messages is an old battery no longer holding a charge.
When does BMW battery warning light come on?
When BMW alternator voltage output is above or below the recommended limit ( typically 13.3-14.5 volts), then the red battery warning light will illuminate on the dashboard, and a message will pop up on the iDrive screen.
Where to find alternator rating on BMW E90?
E90 models can come with a few alternator amperage ratings. Be sure your replacement alternator has the same rating as faulty unit. You can usually find the amperage rating on the alternator housing. Working in trunk, disconnect battery negative cable and cover battery terminal so cable does not accidentally come in contact with disconnected cable.
What do the red and orange lights mean on a BMW?
Red once illuminated indicate an issue that required immediate attention. Orange will typically indicate a less urgent issue, for example a vehicle service required. Other symbol colors such as blue and green provide the driver with information such as lights and indicators. Flashing warning lights inform the driver of an urgent issue.
In most cases, a failing alternator’s early stages will cause these warning lights and messages to come on just for a few seconds and then turn off. One of the most common problems that can cause a BMW battery or alternator warning messages is an old battery no longer holding a charge.
When BMW alternator voltage output is above or below the recommended limit ( typically 13.3-14.5 volts), then the red battery warning light will illuminate on the dashboard, and a message will pop up on the iDrive screen.
Red once illuminated indicate an issue that required immediate attention. Orange will typically indicate a less urgent issue, for example a vehicle service required. Other symbol colors such as blue and green provide the driver with information such as lights and indicators. Flashing warning lights inform the driver of an urgent issue.
What does it mean when your alternator is malfunctioning?
Cars with an iDrive system will display alternator malfunction warning messages such as vehicle battery charge low or vehicle battery discharged while stopped. Once the voltage output is within the proper range again, the warning light will turn off.