You need to ensure all ACP Ethernet ports are daisy chained from the ACP port on controller 1, the ACP ports on both IOM modules on your new shelf, and then back to the ACP port on controller 2. For a HA-Pair configuration all SAS ports on disk shelves should be used.
Here are the cabled connections you need:
Controller 1 0a --> Shelf 1 IOM A SAS Square
Controller 1 0b --> Shelf 1 IOM B SAS Circle
Controller 2 0b --> Shelf 1 IOM A SAS Circle
Controller 2 0a --> Shelf 1 IOM B SAS Square
Controller 1 0P --> Shelf 1 IOM A ACP Square
Shelf 1 IOM A ACP Circle --> Shelf 1 IOM B ACP Square
Shelf 1 IOM B ACP Circle --> Controller 2 0P
Note 0P ports on the controllers refer to the ACP port indicated with a Lock Spanner Port.
Thank you Jonathan. Just to clarify, the only thing that needs to be changed on my diagram is that the two X's need to be connected together right? Checking your explanation against my diagram that looks to be the case but I just want to be sure.