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replace the tranfer case tccm...
The atc fuse is a power supplt for the tccm( transfercase control module) and other ttcm functions
It is located in the dash behind the light switch. To remove it: Open the drivers door, look at the SIDE of the dash. See the panel? pry it off with a flat blade knife. look inside, down to the left, you will see 3 plugs with a bunch of wires, they are attached to the TCCM.
The TCCM is not communicating, DTC U0102, check wires, plugs, or replace TCCM.
The TCCM is on the driver side behind the dash...right behind the the light swith. The easiest access that i have found is to take the dash off that covers the light switch and extends over to the radio area. Also the lower coverings will need to be removed as well. Once those are off, the TCCM can be accessed. It has three connectors (two large blue and one small black). disconnect the connectors and remove the unit. Note: once you have disconnected the connectors you will notice one of the large connectors is grey(middle connector), make sure it goes back into the proper place when reinstalling. If you are replacing the TCCM with a new one, you will have to get it reprogramed. This whole process shouldn't take more than 1 1/2 - 2 hrs. start to finish
TCCM Transfer case control module
The ECM and TCCM are located behind the lower dashboard on the passenger side.
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 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.
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
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
Check behind the glove compartment. The TCCM (Transfer Case Control Module) is located there on some Ford vehicles like the Exploder and the Ranger.