SMC: Stepper Motor Controllers: Construction: Notes

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The left-hand stepper motor controller is identical to the right-hand stepper motor controller.

To differentiate between the two headlights (left and right), pin 12 of the stepper motor controller for the left-hand headlight must be connected to earth. The SMC must be encoded accordingly (either by the headlight manufacturer at the end of the production line or in the workshop after replacement).

The following block diagrams show the stepper motor controller with its connections.

E60, E61, E63, E64, E65, E66 up to 03/2005
E60, E61, E63, E64, E65, E66 from 03/2005
E90

Pin assignment of the stepper motor controllers as per block diagrams.

Fig 1: Stepper Motor Block Diagram (E60, E61, E63, E64, E65, E66 Up To 03/2005)

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: Stepper Motor Block Diagram (E60, E61, E63, E64, E65, E66 From 03/2005)

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 3: Stepper Motor Block diagram for E90

Courtesy of BMW OF NORTH AMERICA, INC.