Disconnecting the connector from the DME control unit and from the power distribution box (PDM)

Prerequisite

Ignition is switched off.

WARNING: Working on 12 V electrical system.
Risk of short circuits! Risk of fire!

Make sure that there is no charger connected to the jump start terminal in the engine compartment.
Detach battery ground lead from battery.
For auxiliary batteries: Detach battery minus cables from all auxiliary batteries.

NOTE: Disconnecting control units may cause fault code entries and functional limitations. Fault code entries must be read out and deleted if necessary.

Unlock all connectors (1) from front to back and disconnect them from the DME control unit.
Unlock all the connectors (2) from the power distribution box (PDM) and disconnect them.
If necessary, disconnect the wiring harness and set it aside.

Courtesy of BMW OF NORTH AMERICA, INC.