Under the dash, blue module to the side of the steering column.
im in the same boat as you but i have an idea where the tccm is. it is located underneath your dash near the steering column
Behind passenger side kick panel.
The TCCM (Transfer Case Control Module) fuse on a 1999 Bravada is located in the engine compartment fuse box. The TCCM is located in the dash on the driver's side to the left of the steering wheel.
The TCCM is not communicating, DTC U0102, check wires, plugs, or replace TCCM.
under the drivers seat under the carpet, when u get it out notice that it is not even sealed with rubber gasket or silicone, this being the reason that it is malfunctioning
TCCM Transfer case control module
The "service 4 wheel drive" light is on because the TCCM (Transfer Case Control Module) has detected a problem with the system. The light will remain on until the problem is fixed. Your local auto parts store can read the code(s) in the TCCM. The code(s) will help determine what the problem is.
The atc fuse is a power supplt for the tccm( transfercase control module) and other ttcm functions
Check behind the glove compartment. The TCCM (Transfer Case Control Module) is located there on some Ford vehicles like the Exploder and the Ranger.
The TCCM is located on the left side of your Dash, behind the knee panel under the steering wheel, is a small box with 3 plugs and it is attached (clip on) to the BCM (Body Control Module).
replace the tranfer case tccm...
It could be your TCCM. Disconnect your negative terminal on your battery for 30 minutes to reset your TCCM and see if that works.