2009 Suburban with 2 issues.
 

I am having problems with my door locks working intermittently. The rear door locks don't always unlock. Also, I intermittently get a service ride suspension message. I am wondering if both of these could be related to a bad BCM?

probably a separate issue as the air suspension uses a separate module. if there is a fault with the system, codes will be stored in the module. A code reader cannot access them; you need a full function scan tool.
the door lock actuators are famously bad. if you are getting power to the actuators, replace them. gruvenparts, a member here makes a replacement part