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Power Supply

When the ignition switch is placed in the KL15 or KL50 positions, Fuse 34 is provided with power. Fuse 34 supplies the wake up or on signal to the EMS2000. Upon receipt of the "ON" signal EMS2000 supplies a ground signal on Pin 97 to the Main Relay. The ground signal energizes the Main Relay, supplying operating power to the following fuses:

The engine is now ready to start.

Fig 1: Engine Management System Air Management
G04724693Courtesy of BMW OF NORTH AMERICA, INC.