CCRM failures are rare? I wish I felt the same. Seriously.
Mine are real old, though... I effectively have 3 Gen2 SHOs and at least one CCRM has failed since I've had these cars (I guess close to 8 years now) but yeah, there are specific symptoms when it fails, e.g. the fuel pump or radiator cooling fan (or other stuff) not operating correctly.
Here's a pinout for the CCRM connector for a 1995 SHO in case it helps you (yeah, it's just a relay box) non-SHO versions are similar:
So, yeah, what are your symptoms?