Question about 1998 GMC Jimmy

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No 4wd when i change switch on dash i have no 4wd

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Most common problem is located under battery tray. There is a vacuum supply coming from top of Trannie going to a plunger style actuator that pulles the cable to activate the front diff. Either check for vacuum and fix or I've relocated plunger to top of motor so I can clamp with vise grips to activate 4*4

Posted on Mar 19, 2014

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Related Questions:

1 Answer

4wd service light in dash just came on. cannot put into 4wd.


There are actuators on the front axle and the transfer case, check them both.

Feb 10, 2014 | 2000 Chevrolet Silverado 1500

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What is a 4 wheel drive switch


Depending on the make and model, it could be the control switch on the dash or the switch that moves the gears in the transfer case.

Dec 04, 2012 | Cars & Trucks

1 Answer

96 gmc 4wheel drive not engaging


There are many vehicles which notice same issue with 4wd not engaging in low or high mode.I suggest you few help links related to these issue,with there troubleshooting details and solutions.
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

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No 4x4 light on dash?

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

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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

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2002 Jeep Wrangler: 4WD Idiot Light is ON?

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

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Traction control switch will not engage on 4WD High or Low
http://whoisbyme.blogspot.com/2012/10/traction-control-switch-will-not-engage.html

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Service 4wd warning light on Dash? http://howtobyme.blogspot.com/2011/11/service-4wd-warning-light-on-dash.html

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Car automatically switches to 4wd low?

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These are the help links related to your issue.Going through these help links,will guide you to troubleshoot and solve the issue noticed on your car.
Keep updated for more help.
Thanks.

Oct 17, 2012 | Chevrolet Cars & Trucks

1 Answer

I recently purchased a 1999 Chevy Blazer 4WD LT with the 4WD AUTO 4 switch push button. We picked it up cheap. We now know why... 4WD dash switch is dead, changed it with a used one lights flash and n


Sounds like the encoder switch is bad ..it on the transfer case .it has a motor with wires going to it.when you press the button it sends a signal to that motor to switch into a certain gear..

Apr 21, 2012 | Cars & Trucks

1 Answer

4wd does not work iv changed the 4wd switch but still does work and on the 4wd switch none of the lights come on to tell you if you are in 2wd or 4wd hi or low


the switch is probably from a newer modle truck, although they work the indicator lights don't always work, and check the 4x4 fuse in the fuse panel on the left side of the dash by the drivers door

Nov 07, 2010 | 1999 GMC Sierra

1 Answer

How do I replace 4wd switch?


the switch pulls out of the dash. To take the dash out you have to take a few bolts out then the rest is just snapped in. the bolts are either a 7mm or an 8mm. But if you are changing it because the lights are out thats probably not your problem your control modual probably needs re programed

Feb 11, 2010 | 2002 Chevrolet TrailBlazer

4 Answers

The Service 4wd light used to go on and off


Drive in circles, one direction then the other and it should come out...Gears get preloaded and will remain so until this load is released...

The engauge/disengauge control does not have power to overcome gear preload.

Doc

Sep 21, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

4wd light on dash not working, changed switch on shift, bulb in dash and 4x4 computer control behind centre console. Also changed both switches in front axle but still no 4wd. Why?


Dear Fixya,

Solution at hand. I chased the harness to the gearbox. I methodically electrically earth tested each wire-to-switch and visually checked each wire for breaks whilst another kept turning on and off the 4wd switcth on shift. Eventually, at the rear end of the gearbox there is a multi connector of some several wires. One end had a female and the other exposed male pins. On counting the pins I noticed that one pin, on recollection green/red wire had been drawn back into the connector so not making a contact. I therefore, pushed the pin back through so to make a connection. All of the 4wd pneumatics, light on dash and front axles switches now work. That one wire caused total shutdown of the High 4wd system. I assume that during either off-roading or average road use an object, like a branch, fouled the rear connector and dislodged the wire connection.

Thanks for your quick response. Hope the above will help someone in the future.

Kindest regards,

Carl.

Sep 11, 2009 | 1993 Toyota Pickup

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