Question about 1998 Chevrolet S-10 Pickup

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1994 chevy s10 will not shift too 4x4,lights come on, on the switch, here clicking sound from tccm and that is it.

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Well it could be that your tccm is failing your your encoder motor on your transfer case

Posted on Sep 30, 2009

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4x4 indicator lights not working.


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I am experiencing grinding in the front differential on my 2003 s10 4x4. It occurs shortly after engaging the 4x4, but only once in awhile. The diff does not make any noise at all when working properly. ...


It's either a vacum shift actuator, Rusty actuator cable, weak spring in side of the differential shift mechanism, TCCM (control module), switch, or vacum switch on transfer case ( start there). But all told, $980.00 in parts and $1200 in labor. Now take a deep breath as you call the tow truck to tow it to the junk yard.

Feb 09, 2011 | 2003 Chevrolet S-10

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I have a 2000 s10 blazxer with no 4x4.not 4x4 lights on the dah nothing.changed the tccm,4 button switch and encoder motor.any help appreciated.


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For this car, it can be really pricy or you can take my advise. I would recommend that you remove the 1 or 2 screws located on the reverse side of the shifter!. once you do this, you basically deactivate a safety device that is preventing you from shifting your car into gear! The safety device basically will not allow you to shift until you press firmly on the breaks and the key is installed. TAKE IT FROM AN EXPERT who has been there done that hundreds of times. you can find the screws on the reverse side of the shifter, just feel for them with your fingers.

Jan 29, 2011 | 1994 Chevrolet S-10 Blazer

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Rdon't know where sensors are located to energize the four wheel drive seems as if one maybe bad


Questions and Answers Chevy Blazer 4WD Shifting Problem
Q. I have a 1994 Chevy T10 Blazer 4x4 with the 2.8 liter V-6 Vortex engine with an automatic transmission. When I go to engage the 4hi or 4lo, the lights on the switch flash and I can here the transfer case engage and then immediately disengage. Is this a vacuum problem? I found the relay switch box under the dash and disconnected it then reconnected it.
mechanic.jpg

Sometimes this works, sometimes it doesn't. The other day someone told me the vacuum actuator is located under the battery. As soon as I removed the battery bracket, battery still connected, The switch worked and the 4h/4l worked, I tightened up the battery bracket and all of a sudden it stopped working again.

I repeated the above steps and everything is working properly for now! Any ideas as to what might be causing this?
Thank You...
A. I'll try to explain how this system works for you. When you push a button, the signal goes to the Transfer Case Control Module (TCCM), a small metal box under the dash. In turn, it sends a command to the encoder motor which is mounted on the side of transfer case.

On a working unit, the transfer case will shift to the selected range. This will cause an internal movement of the linkage which pushes up on the ball of the vacuum switch. The vacuum switch has 3 hoses to it. One is the supply from manifold vacuum, one is the feed that goes to the actuator under the battery. The other is to drain off the vacuum when it's taken out of 4x4.

There should be DTC's stored if you can't get it to shift. These are read by jumping 2 wires in the ALDL plug under dash. All codes will have you check for 5 volts at the encoder motor plug on the 4 terminals. I have had this trouble in the past and fixed a few by running a new ground wire to the encoder terminal that is ground. I don't have a schematic handy so I can't help you there.

Unplug the TCCM, try tapping on the encoder motor and re-install the plug after it's been unplugged for at least 2 minutes. Cycle the ignition on and off 5 times, then on. Now try to make a shift.

I have seen ruptured servos under the battery. Battery acid leaking down and eating into the servo cable that runs to the front axle making it too stiff to move the cable. If the switch light changes from 2 to 4h, the TCCM and encoder should be okay and the problem is most likely in the vacuum switch or servo area.


Jan 14, 2011 | 1996 Chevrolet Blazer

4 Answers

I have a 1994 S10 Blazer with 4.3 Vortec engine. My 4X4 is not working properly. It is sort of intermittently working. When I depress the 4X4 LO position on the switch, there is no indication of anything...


If I'm not mistaken, there should be a module or relay. Not for sure where it's at. Heard of these going out and not being able to switch into 4 wheel drive. I know on a 200'? Ford F-250 they have a motor on the side of the transfer case. That switches it into 4 wheel. Signal from 4x4 switch is sent to module then to the motor that engages the transfer case. Hope this makes sense. Hope this helps.

Feb 24, 2010 | 1994 Chevrolet S-10 Blazer

1 Answer

96 s10 blazer 4x4 wont work lights flash on dash but shift transfree case put new motor on transfree case


Listen for the TCCM (transfer case control module) to "click" when 4X4 is activated behind passenger kicker panel just in front of passenger door near floorboard. If it clicks then is activating and with the new motor on transfer case that would make me think it has something to do with the 4X4 vacuum lines. If you look under the battery tray you will find the vacuum canister that activates the front hub when 4X4 is activated. take out ur battery and position it so you can still have it hooked up or with jumper cables and still see the canister and turn your truck on and engage 4X4 to see if vacuum canister activates to lock in front hub, if not just follow and check vacuum lines. Also check, ALL, fuses as there are many fuses that in my opinion are miss marked as with the logic side of TCCM is ran through the fuse marked for the Dome Light. Have also heard of parking lamps having something to do with it too... just a few suggestions from things I had to go through with mine

Dec 15, 2009 | 1994 Chevrolet S-10 Blazer

2 Answers

My 2000 s10 blazer 4x4 doesnt work.no lights on the dash.nothing.cleaned the wires on the tccm ,tested it with a test light and there is power.but no lights on the dash.no 4 hi or low or auto.what can it...


I have had luck over the years with unplugging the TCCM for about 5 minutes and plugging it back in for a reset if this doesn't work and all your fuses are ok I have also had the motor and circuit board on the side of the transfer case short out and cause this problem.

Nov 19, 2009 | 1994 Chevrolet S-10 Blazer

1 Answer

Newly installed transfercase in chevy s10 now won't shift correct


Looking at all your probs, my guess is you have the wrong transfer case! It may be one for a diesel! Frankster016

Nov 23, 2008 | 1994 Chevrolet S-10

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