Where is the TCCM located on 93 S10 Blazer?

I just bought a 93 S10 Blazer with 91k actual miles. It’s in very good condition over all, and is truely one of those ‘little old lady cars’ (meaning who I bought it from). But the 4wd doesn’t work. The 4hi/4lo switch on the dash does not show any lights when pressed. The TCCM fuse is good. I just don’t know where the TCCM is exactly to check the connectors.

anyone? I have since learned the TCCM is ON the computer but I can’t even find the computer on this truck.