Using the Add Data command

Steps:

1. Click the Add Data button on the ArcMap Standard toolbar.

The Add Data dialog box opens.

2. Navigate to the geodatabase that contains the schematic dataset where the desired schematic diagram is referenced.
3. Browse to the schematic dataset or the schematic folder that contains this schematic diagram.
4. Choose the schematic diagram.
5. Click Add.

The schematic diagram is added to the active data frame.