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Transfer case motor testing

I need to find out how to test the transfer case motor and the wiring on a 94 s-10 blazer tahoe edition with push button 4x4 switch. I seem to have an electrical problem and need to see if the motor is shorted out. How can you test the transfer case motor?

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  • jlengel2765 Dec 18, 2008

    I have the same problem. Now the thing is stuck in 4 low and I can't get it out.

  • soaringspiri Dec 18, 2008

    Several years back had a problem with push button 4x4 engaging.. was problem with engage mechanism; not sure if it was vacuum or cable.. but that was problem.. normally use 4x4 regularly but hadn't used for 6 months.. go to use this week in lieu of a storm and wouldn't engage correctly; almost like one hub wouldn't engage.. to get back into 2x I had to stop; back up a few feet.. ironically to when I turned it seemed to engage or disengage easier.. car is in the shop now.. will let you know results once I get them...

  • yadayada
    yadayada May 11, 2010

    You must pull the motor assembly out and jump 12 volts to the motor wires, make sure u do this right or you can damage the circuits.

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SOURCE: transfer case motor for push button 4x4

CharBar...

Check the Actuator directly underneath the battery and battery tray.... if the rubber is torn there's your problem... I had the same problem 2 years ago

Posted on Dec 30, 2008

  • 21 Answers

SOURCE: transfer case motor for push button 4x4

i have a 1993 blazer 4.3 w code 4x4 with a 4L60 E . my truck wouldn;t go in 4 hi or low. so i changed the transfer case motor and it works fine now. If you turn the ignition key to on but not crank the engine and open the driver door and push 4 hi button, you should hear the transfer case motor cycle for 3 or 4 seconds every time you push button and the light will flash until it goes in 4wd If the 4 hi button light doesn't flash during cycle then it could be a bad switch. if the transfer case motor won't cycle it could be a fuse or a bad transfer case motor . Hope this answers your question.
pgale89

Posted on Feb 08, 2013

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I would put my money on a bad encoder motor. The motor is bolted to the side of the transfer case. With the problem present scan for transfer case codes. There will likely be codes stored in history as well. Once you know those codes you will know what test you have to do in order to accurately diagnose the problem.

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Check the fuse to the 4x4, if the fuse is good then check the 4x4 electric motor actuator on the transfer case. You should hear it work from 2wd, 4hi to 4low and back to 2wd with the push of the switch. if you don't hear it working then check the wire harness at the actuator motor, look for any damages like corrosion or cracked wire connector clips. If all electrical is in good working order, replace the actuator motor. If the 4x4 actuator is working on the transfer case, then the front hub 4x4 actuator may have gone bad and that's located on the front differential. It's common for the clip there to corrode and break and is an easy fix with a new collar pin, at worst it's the diaphragm on the vacuum actuator that is located under the battery tray. There is a vacuum switch on the top of the transfer case, driver side but when that fails, your front hub stay's locked in the on position. Good luck and keep me posted and hope it's a simple fuse that has gone bad. You can pick up all these parts at Auto Zone or Parts Source and they will have the step by step instructions for you to get the job done with common tools.

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1. Inspect Transfer Case Control Module (TCCM) and encoder/motor wiring, terminal contact, grounds.

2. Install updated TCCM calibration.

3. Inspect for TCCM water intrusion.
4. Replace transfer case encoder/motor. 1. Check voltage on pin A, Light Blue wire at the engage switch.

2. The voltage should remain near 1.0v with no buttons pushed, compare to the value on the scanner when the problem happens.

3. Back close to the switch by hand and check for a glitch.

4. Wiggle tug test harnesses at the switch and TCCM.

5. Check terminal to pin grip. could be your transfercase control module locater under drivers side of dash. or the encoder motor

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1993 FORD EXPLORER,AUOTMATIC 4.0 XLT , PUSH BUTTON 4X4 = I HAVE CHECKED THE TEST MODULE IN THE REAR ABOVE DRIVER'S SIDE FENDER WELL UNDER PLASTIC COVER,UNPLUGGED THE 2 CONNECTION'S AND THE LIGHT FLASHED 4...


there is a neutral switch tied into the transmission, the transfer case will not shift into 4 hi unless the trans is in neutral or park, and 4low only if the trans is in Neutral and the transfer case is in 4hi. CHECK- transmission neutral switch, transfercase feedback switches.

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It is likely your switch, GM switches go bad all the time. The easiest way to test this is to pull off the door panel and hook two wire directly to the motor.

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Transfer case motor for push button 4x4


i have a 1993 blazer 4.3 w code 4x4 with a 4L60 E . my truck wouldn;t go in 4 hi or low. so i changed the transfer case motor and it works fine now. If you turn the ignition key to on but not crank the engine and open the driver door and push 4 hi button, you should hear the transfer case motor cycle for 3 or 4 seconds every time you push button and the light will flash until it goes in 4wd If the 4 hi button light doesn't flash during cycle then it could be a bad switch. if the transfer case motor won't cycle it could be a fuse or a bad transfer case motor . Hope this answers your question.
pgale89

Dec 16, 2008 | 1994 Chevrolet S-10 Blazer

1 Answer

4 high not working


sounds like the transfer case has gone bad and needs to be rebuilt. if it is a newer style blazer (late 90's or newer) with the push button transfer case it could be the motor that shifts the transfer case is bad or not install right.

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