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I have a 2000 chev 1500, I bought it without 4x4 working. The switch on the dash doesn't light up, & 4x4 does not engage, i know it isn't the switch, because I bought a new working switch and put it in and no lights. There is also no service 4x4 displayed on the dash, curious as to what the cause of this could be, 4x4 actuator switch? Thanks, Brett

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  • Cars & Trucks Master
  • 2,101 Answers

Your truck has a electrical motor that controls the shifting of 4 wheel to 2 wheel in the transfere case

Posted on Nov 02, 2012

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Posted on Jan 02, 2017

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SOURCE: 1999 chev blazer 4x4 system

I have a 1999 chevy blazer that stuck in 4 wheel drive. How do you get it out.

Posted on Dec 18, 2008

  • 38 Answers

SOURCE: 1996 Ford F150 4X4 won't shift into low range

I am not sure about Ford, but several of the 4x4 models use a vacuum hose connected to engine vaccum to switch the 4x4 functions. If you have a push button engage system then you may want to check the rubber hoses around the front drive shaft. This only applies for the push button models.

Posted on Feb 02, 2009

csmock132
  • 4669 Answers

SOURCE: 4wd not engaging

Is it a two wire actuator or a three wire actuator? The two wire ones are pretty unreliable. that is why Chevrolet converter them to the three wire. Check for power and ground on the two wire in 4wd. For the three is should have one ground wire, one wire that is hot in 4wd, and one wire that is hot in 2wd.

Posted on Mar 02, 2009

flacooo1
  • 172 Answers

SOURCE: 4 lo working, 4 hi stopped working , A4WD never worked

Hi my name is Juan and I do own a trailblazer with the same year 2002 and I read the problem you have let me try to help you Have you try to shift to 4hi with your transmission in neutral ? the transmission needs to be in neutral in order to shift the transfer case to 4hi and the vehicle needs to be completely stooped also is your service 4wd light on?? if the light is on your transfer case needs service and it can be as simple as the switch inside your car or a solenoid that has not been detected by the computer

Posted on Mar 30, 2009

sscullys
  • 984 Answers

SOURCE: 4x4 lights on dash come on,transferr case kicks

Sounds as if the transfer case is fine, but best to confirm. Jack up and support the front of the truck ( wheel chocks, jack stands, normal safety precautions ).
Turn the key from off to run ( do not start ) select 4WD ( L or H ). Try to turn the front drive shaft. If the shaft turns, the transfer case shift motor ( or linkage if Mechanical shift on the fly ) is the problem. With the 4WD lights illuminated, I would say the front shaft will not turn ( shift position switches are registering correctly ), and the problem is with the front axle locking in ( assumption, prior to testing ).
There is a vacuum shift diaphragm on the front axle. One of the vacuum solenoids is for 4Wd one is for 2WD. If the vac lines are cracked, the solenoid is not working correctly ( applying vacuum to the shift diaphragm ) or the shift diaphragm itself has an issue, the lever in the front differential will not shift.
Start by checking for vacuum on the shift diaphragm. The 2 vacuum lines are pink and blue. Pink is the 2WD operation, and the blue is the 4WD operation. Remove the vacuum lines 1 at a time, and install vacuum gauge. Start the engine, and shift into 4WD. The vacuum gauge should read and hold pressure. You can get the same test by watching the vacuum shift diaphragm and have some shift the truck into 4WD, but won't know if the lack of movement is from no vacuum or the shift diaphragm itself.
This is what is looks like on the front axle.
65c2eb4.jpg

The vacuum shift solenoids look like this :
c2c89a6.jpg

The vacuum shift diaphragm on the front axle, is located at #10 :
d24fd29.gif

This is the vacuum line diagram
ffc76b5.jpg

It could also be the vacuum reservoir or the vacuum lines to the shift solenoids ( shift solenoid has no vacuum to apply ).

There is the outside chance that the solenoids are not being signaled by the GEM, but that is a rare occasion. The GEM applies ground to the solenoid, so expect power to always be there, when testing to another ground if you get to that point ( still think it is a vacuum problem or the application of vacuum )

Hope this helps more than confuses.

Posted on Dec 20, 2009

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Click the link below: ---

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http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

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http://technoanswers.blogspot.in/2012/02/4x4-will-not-engage-on-ford-f150.html

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Dodge Ram 4x4 light keeps flashing

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I have a 1999 dodge sport 1500 4x4 and it makes a clunking sound like it is skipping gears when I engage it in four wheel drive at times. I checked all fluids and changed them and checked u-joints and all...


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On these issue, there are few solved help links for troubleshooting the issue easily.-------

Click the link below: ---

No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

-----------

4X4 Truck makes roaring noise in the front end?

http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html

-------------

Car will not go into 4WD high or 4WD low?


http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html

--------------

No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

------------

4 wheel drive system will not disengage?

http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html

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4WD light is flashing and beeping? NO 4WD high?

http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html

----------

2002 Jeep Wrangler: 4WD Idiot Light is ON?

http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html

----------

Traction control switch will not engage on 4WD High or Low

http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html

-----------

4WD light flashing and 4WD will engage after few minutes

http://repairhelpcenter.blogspot.com/2012/10/4wd-light-flashing-and-4wd-will-engage.html

------------

2008 Toyota Tundra: 4x4 Wheel Drive Light is Flashing?

http://technoanswers.blogspot.in/2012/05/2008-toyota-tundra-4x4-wheel-drive.html

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4x4 front differential will not engage the axle on ford?

http://technoanswers.blogspot.in/2012/02/4x4-front-differential-will-not-engage.html

-------

4x4 will not engage on Ford F150?

http://technoanswers.blogspot.in/2012/02/4x4-will-not-engage-on-ford-f150.html

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Dodge Ram 4x4 light keeps flashing

4X4 LOW LIGHT IS FLASHING ON DASH

http://technoanswers.blogspot.in/2012/09/dodge-ram-4x4-light-keeps-flashing.html

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http://technoanswers.blogspot.in/2012/02/ford-4x4-front-wheels-will-not-engage.html

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These details will help.

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On these issue,there are few solved help links for troubleshooting the issue easily.-------

Click the link below:---
No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

-----------
4X4 Truck makes roaring noise in the front end?

http://schematicsdiagram.blogspot.com/2012/01/4x4-truck-makes-roaring-noise-in-front.html

-------------
Car will not go into 4WD high or 4WD low?


http://schematicsdiagram.blogspot.com/2011/12/car-will-not-go-into-4wd-high-or-4wd.html

--------------
No 4x4 light on dash?

http://repairhelpcenter.blogspot.com/2011/12/no-4x4-light-on-dash.html

------------
4 wheel drive system will not disengage?

http://technoanswers.blogspot.com/2012/01/4-wheel-drive-system-will-not-disengage.html

----------
4WD light is flashing and beeping? NO 4WD high?

http://schematicsdiagram.blogspot.in/2012/02/4wd-light-is-flashing-and-beeping-no.html

----------
2002 Jeep Wrangler: 4WD Idiot Light is ON?

http://technoanswers.blogspot.in/2012/06/2002-jeep-wrangler-4wd-idiot-light-is.html

----------

Traction control switch will not engage on 4WD High or Low

http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html

-----------

4WD light flashing and 4WD will engage after few minutes

http://repairhelpcenter.blogspot.com/2012/10/4wd-light-flashing-and-4wd-will-engage.html

------------
2008 Toyota Tundra: 4x4 Wheel Drive Light is Flashing?

http://technoanswers.blogspot.in/2012/05/2008-toyota-tundra-4x4-wheel-drive.html

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4x4 front differential will not engage the axle on ford?

http://technoanswers.blogspot.in/2012/02/4x4-front-differential-will-not-engage.html

-------
4x4 will not engage on Ford F150? http://technoanswers.blogspot.in/2012/02/4x4-will-not-engage-on-ford-f150.html

-------------
Dodge Ram 4x4 light keeps flashing 4X4 LOW LIGHT IS FLASHING ON DASH

http://technoanswers.blogspot.in/2012/09/dodge-ram-4x4-light-keeps-flashing.html

----------
Ford 4x4 front wheels will not engage?

http://technoanswers.blogspot.in/2012/02/ford-4x4-front-wheels-will-not-engage.html

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These details will help.

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