Passive air flap control via electromagnet

If only the passive air flap control is installed, the electromagnet is switched on and off directly via the engine management system (DME/DDE).

The electromagnet is supplied with voltage via terminal 87.

Fig 1: DME/DDE - Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

Index	Explanation
1	Electromagnet
2	Engine management system (DME/DDE)

When voltage is applied to the electromagnet, the radiator shutter is closed and held in this position.

When power is disconnected from the electromagnet, the radiator shutter opens while the vehicle is being driven due to the air stream. When the vehicle is at a standstill or is moving slowly, the radiator shutter is opened by the air flow of the intake radiator fan or electric fan.