Stepper Motors

These stepper motors are MUX5 motors (multiplex motor type 5).

There are 9 stepper motors used on the E60 IHKA system. All motors are connected to the LIN Bus. The LIN bus circuit consists of three wires, power (B+), ground and the LIN bus signal wire.

The stepper motors for the fresh air/recirculating air flaps are designed as high speed motors.

This system does not use any bowden cables for flap actuation.

Fig 1: Identifying Stepper Motors

Courtesy of BMW OF NORTH AMERICA, INC.