The 3 Series BMW door mirror cable is a strong, plastic coated cable which is attached to the wing mirror and is used to adjust the positioning of the mirror to enable the driver to see other objects on the road and assist with moving from one lane to another.
In a manual door mirror operation, this flexible cable is attached to the door interior and is controlled by a lever to adjust the mirror. In an electric door mirror system, this cable consists of a series of wires that are covered with a protective plastic coating and is attached to the vehicles power supply. The 3 Series BMW door mirror cable in this case controls two motors which allow the mirror to move up and down and sideways. As with the manual door mirrors, these are operated by a switch inside the vehicle.
If a manual 3 Series BMW door mirror cable is damaged, the driver will be unable to move the door mirror. The driver may also notice that the lever controlling the mirror moves more easily than usual. In the case of an electric mirror failure, this could be caused by a wiring fault.