Question about 1999 Chevrolet Blazer

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I have a 99 chevy blazer. Trying to get 4x4 working since it hasn't worked in years. I put new vacuum switch in transfercase and vacuum accuator under the battery. Also a new dash push button switch. Problem is the dash switch lights up when I turn the key on or start it, but then all the lights go out and stay out and the 4x4 doesn't work at all. Please help

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Hello,
Michael has the right answer, If the motor is not working than it will not go into 4WD but you can remove that motor and actavate it off and see if it is working

Posted on Nov 18, 2014

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The transfer case has a stepper motor on it to switch between 4wd and 2wd. Those are common to go bad. If the module sends the command to switch to 4x4 and the motor does not move all lights will go off and it will stay in 2wd. I've replaced several and it solves the problem 98% if the time. The motor varies on the model of transfer case and also on if you have a 3 button control or 4 button. It will bolt to the side of the transfer case

Posted on Nov 15, 2014

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The 99 blazers have a problem with the 4wd transfer case module. The module is located inside on the passenger compartment, right side front behind the "A" pillar kick panel. Make sure the connections are dry and doesn't look like water has been leaking on it. make sure the connections are not corroded and locked properly. If all looks good and the 4wd module is not blown, replace the module. The module runs about $150 to $200 depending on whether its a 1 or 2 connector reconditioned module or you can check the salvage yards.

Good luck.

Posted on Nov 13, 2014

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You replaced everything. The only thing left to fix would be the wiring. Check for power and grounds first. then start replacing the wires.

Posted on Nov 13, 2014

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Posted on Jan 02, 2017

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SOURCE: 2000 chevy trail blazer 4x4 does not engage

vacume problem for sure

Posted on Nov 25, 2012

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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.


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Fab only gave part of an answer. Check the vacuum lines on the driverside firewall. Also check your heater/AC unit make sure the air deflector will change from defrost to vent. If it stays on defrost no matter where you put the knob then you have a disconnected or leaking vacuum line to the dash. If that works and you don't see any open hoses then remove the battery and battery tray. You'll find the actuator there. Remove the vaccum line that goes to it, connect the battery or jumper cables so that you can start the engine. Put it in 4HI and feel for a vacuum at the line. If you do then put it on the actuator and see if it pulls on the cable. If there is no vacuum at that line then the switch at the transfer is bad and isn't sending vacuum to the actuator. If you do have vacuum and the cable didn't pull then change the actuator.

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