Disconnect the wires from the battery terminals.
Remove the mounting block cover.
Disconnect the center connector of the block.
Loosen the Phillips head screw and rotate the unit 180°C.
Disconnect wire bundles A and B with all wires (see photo).
Move the hook and remove the bracket for the diagnostic connector and the connector itself from the mounting block.
Unsolder the remaining wires 1-7 (see photo) from the mounting block.