yeah this side of it listed on page 9 of the install guide..
Input Expansion Module (optional)
The optional input expansion module enables up to eight (8) non-CenCom
vehicle components and/or equipment to be integrated into the CenCom/
Cantrol network.
As shown in the tables below, connect
the input wire of the desired device
to the appropriate wire. For example, if the device in question requires a
Positive input signal, that input wire would be connected to the BROWN
expansion module pigtail wire. In this example, that device would be
recognized as “INPUT 1” by the CenCom/Cantrol system. However, if that
device requires a Negative input signal, that input wire would be
connected to the WHT/BRN expansion module pigtail wire. Note that this
device would be recognized as “INPUT 1” by the CenCom/Cantrol system.
though the carbide does list an expansion module that does this...
Expansion Modules
Supports up to two of the following:
Front WeCan Inner Edge®
Rear WeCan Inner Edge
Optional Remote 16 Output Modules
pdf 14585D WeCan Expansion Module