Underneath the car center under the rear seat floorboard. There's a little work involved. Only 3 bolts hold it in, but the wiring change-out is a pain.
SOURCE: GEM module replacement
try a salvage yard that has an expedition or an f150 pickup and take the parts off and install in yours disconnect the negative side of the battery and you shouldn't have to have it reprogrammed
SOURCE: 2000 s10 blazer 4x4
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/* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;}Hi: If the front diffis fine then it boils down to usually one of three things why it won’tengage. 1 – No power, 2 – relay notworking (located by passenger side) right side or 3 – no vacuum. The 1995 and up Jimmy’s and Blazer’s use thesame system for engaging the front diff. They are all made to “shift on the fly” while driving down the road withnothing to do but press the button on the dash. (Do NOT shift into 4 Low while driving at higher speeds at it can dodamage). If the dash light flashes andyou hear a clicking sound that means you have power to the relay. If the vehicle 4 High lights stops flashingand it goes back into 2 High then the problem is likely that you have no vacuumto the 4 X 4 actuator module which is located below the battery tray. Remove the battery and tray; look for a holeburnt in the vacuum line or actuator module rubber diaphragm. When the activator get vacuum it pulls acable that attaches to the front diff engaging it, when engaged the wires onthe front diff send a signal to the 4 X 4 light on the dash telling you it is engaged). If the battery has ever leaked the acid runsdown onto the actuator causing the problem. If no holes found in the hose or actuator diaphragm I would use batterycables and hook up the battery and start vehicle then check for vacuum byputting my finger on the end of the actuator hose. If there is vacuum then problem in actuatoror cable linkage. If no vacuum I wouldthen trace back the vacuum lines to find where it is off or leaking, NOTE: As the heater control operates on vacuum and some other vehicle systemsdo as well bear this in mind, has your vehicle had heater control problems orbeen running rough, this could explain a lot of potential problems. Attached to the hood on the left side(drivers side) on 1997 and older models is a vacuum (a “ball”) canister, newermodels the canister is located in the left fender by the brake module, makesure the vacuum line is attached there. Please rate this suggestion as I never know if it is worth my timefilling these things out…
SOURCE: where is the transfer case control module located
It is located under the driver side dash, on the steering column. See diagram below:
SOURCE: No heat in my 2000 ford expedition
You should check your blend door, go to the center of your dash look down towards the floor right at the bottom on the hump (tunnel area) you will see a black or same as interior color, cover it has small slits cut in it, it is held in by two expanding type plastic bolts, they do not unscrew, just pull them out, one on each side. Once removed locate the white small box with a wiring harness connected to it, a little to the right hand side. This is the stepping motor that controls the blend door. Remove the stepping motor, and reconnect the harness, look at the motor drive unit and operate the heater control knob, does the motor turn, if it does then use a mirror and look at the drive end of the blend door itself, it is probably broken. If the door is broken, this repair just got difficult, the entire dash will have to be removed to access the environmental station, once accessed there are about 10 screws that hold the top cover on the enviromental station, undo these screws and remove the top cover, then you can remove and replace the blend door. If you are not comfortable with this difficultly level in repair I suggest you seek out your favorite local shop. removing the dash is not easy, there are alot of screws, some in very difficult places to reach. Testing the motor is easy. I hope this helps, let me know.
SOURCE: location of transfer case control module
Under the drivers side dash......it is facing towards the driver so the connectors can be reached. The module just pops out.
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