Question about 1993 Chevrolet K1500

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Where is the actuator switch located on the transfer case?(the switch that engages the 4wd)Thanks!

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The actuator solenoid along with the axel solenoid
switch are located at the rear of the front axel on the
right side.And the transfer case switch is located on
top of the transfer case left side. Hope this helps.

Posted on Feb 08, 2010

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1990 GMC suburban actuator and fuse location. There is not one on front differential and no place for fuse in fuse block. 4 wheel will not engage. No owners manual


The actuator will not be on the front differential or drive line, it will be on the transfer case, which is mounted behind the transmission. Follow the front drive shaft back from the front differential, and the component at the rear of the driveshaft is the transfer case. That is where four wheel drive is engaged/disengaged.
I'm not familiar with your vehicle, but if you have a separate lever to engage 4wd, there will not be a fuse for the actuator - it is a manual system. If the 4wd is selected electrically, check that all wiring and connectors on the transfer case are in good condition.

Sep 25, 2016 | 1990 GMC Suburban

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Why won't 4 wheel drive engage?


4WD Transfer Case Position Sensor/Selector Switch May ...

repairpal.com > Problems > GMC > Sierra 1500
you can hear the transfer case kickin in, but the front wont lock in. replace the actuator and ... service 4wd indicator came on after trouble trying to engage 4wd.

Aug 11, 2015 | Cars & Trucks

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Hello, I have a 1992 Chevy K1500 pickup, 5 speed, 4WD. I just replaced thermal 4WD actuator for the front axle with the new motor type and with a new wiring harness. Always goes into 4WD right away now....


Sounds like you have the actuator switch set to tight. You might want to try to adjust the switch so it has a little room between the switch and the shifter. Hope this helps.

Apr 12, 2017 | 1992 Chevrolet K1500

1 Answer

4x4 push button is not working about how much does


This is something you can do yourself if you have ever worked on a vehicle before. The part you need is called a front drive actuator valve. It costs about $ 50.00, GM part # 15165891.
Here is some more infor about it:

Main 4wd Components:
TCCM
- Transfer Case Control Module - Located behind the glove box. This is the electronic 'brains' behind the shifting.
Switch - The push button switch in the dash - driver input/indicator.
Encoder Motor - Located on the transfer case - This is what actually shifts the transfer case, and tells the TCCM what position it is in.
Vacuum Switch - Also located on the transfer case - This is what sends vacuum to the vacuum actuator (see below) when the transfer care is in 4HI or 4LO.
Vacuum Actuator - Located under the battery tray - This is what engages or disengages the front driveshaft.
Front Axle Switch - Located on the front axle - This is what tells the TCCM when the front axle is engaged.

If you want to try and replace it yourself, please let me know how it goes.

Feb 11, 2010 | 1998 GMC Jimmy

2 Answers

I have a 2002 Chevy Silverado 8 cylinder 4wd extended cab. It has the push button shifter for 4wd. When I try to use 4WD Auto or 4WD Hi, the indicator lights come on but the 4wd does not engage. I read...


Fuse is located at the end of eh dash on drivers side and the Actuator is located at the front differential and on the passenger side.
When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts. The actuator may not be fully engaged or disengaged and the fork to the spline may be what is causing the grinding.

88-UP C/K ACTUATOR UPGRADE
VEHICLE SERVICED: 88-99 CHEVROLET FULL SIZE
PURPOSE: IMPROVE AXLE CONNECT ENGAGEMENT TIME AND
COMPONENT RELIABILITY.

SYMPTOMS: NO FRONT DRIVE AXLE ENGAGEMENT WHEN SHIFTED INTO 4X4.

Obtain the following GM part numbers:
(1) 26060073 Actuator
(1) 88959465 Harness/Spacer Kit

Feb 03, 2010 | 2002 Chevrolet Silverado

2 Answers

Front end will not lock in in 4x4 transfer case is in & dash lite shows 4x4 but front wheels don;t lock in


Ok, this is probably going to sound greek if you have no automotive experiance, so here goes:

There are 2 possibilities I can think of at the moment depending on your 4wd system, however there are several things that can cause this

If you have a Push button 4wd (you push a button or turn a knob) the system engages using actuators or sylinoids meening you turn the 4wd on, the switch sends power to the selector option (high and low) and the 4wd light on the dash. the selector determines where the actuator/silenoid engages (either high or low) in the transfer case. However the actuator or silenoid can be faulty and yet the system will say 4wd is on because the switches still sending power to the 4x4 light

The next setup is the manual linkage set up, and given the year of your kia I doubt you have this setup However I am going to go through it anyway.

With a maual linkage setup you engage the trasfer case maualy using the 4wd shifter. Ironically on newer manual shift 4wd systems the dash light is still triggered electrically by location of the shifter not what is going on in the transfer case (Ah a flaw in the design) So if you linkage is loose/bent/damaged or somehow disconnected your 4wd wont engage but the light will still show that it is! Hope this helps

Jan 30, 2010 | 1999 Kia Sportage

2 Answers

89 jeep cherokee 4 wheel drive won't engage gears arn't meshing and no indicator light


If you engage the 4WD with a switch instead of manually, there is a motor in or on the transfer case. Because of the location, these can go bad. u need to check all your switches and actuators there are actuators under vehicle that clog up with dirt.also try putting vehicle in neutral before engaging 4x4.
This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya.

Dec 21, 2009 | 1989 Jeep Cherokee

1 Answer

98 Chevy S10 4wd drive will not engage when button is pushed


your problem sounds like either the transfer case control module located where you hear the clicking sound, or the actuator on the transfer case itself.

try unplugging the transfer case control module and then plug it back in, try engaging 4wd again (make sure your in neutral, coasting at 1-2 mph might help as well) if it still doesn't work check the actuator itself to see if the actuator is trying to engage. if the actuator is trying to engage but doesn't, take the actuator out and check it for wear or damage. if the actuator seems fine and it responds to the buttons when pressed i'd go after the transfer case control module as the culprit. ran into that a few times on those s-10's. 3 out of 4 that i've seen were fixed with a new tccm. 1 of the 4 needed an actuator, check your local junk yard for a working tccm or actuator.

hope this helps!

Feb 17, 2009 | 1998 Chevrolet S-10 Pickup

2 Answers

4x4 wont engage


First thing to make sure of is to check for a blown fuse. The fuse location is marked 4WD and it should be a 25 amp fuse. If the fuse is bad, the lights on the 4wd console wont light up. If the lights do light up, then you can move to the transfer case. On top of the transfer case, toward the rear of the truck is a switch that has a 2 wire connector. That switch sends power to the front axle actuator when you try to enagage 4wd inside the truck. That could be bad. The switch is threaded into the transfer case and is still available through GM. If the switch is ok and the wiring that attaches to it is ok, then you can move up to the axle. Threaded into the front axle is the front axle actuator. These actuators are prone to failure in older trucks and is very prone to cold weather failure. You can test the actuator by removing it and then WITHOUT the truck running, put the truck into 4wd and then turn the key to the hot position. The plunger inside the actuator will extended outwards. More than likely it will be one of those 3 things. If it still wont engage, you may have a short in one of the wiring harnesses associated with the 4wd system. Also, you may have a damaged transfer case. To check the transfer case, put the truck in 4wd without it running and then crawl underneath and see if you can turn the front shaft by hand. If not....it's good. If you can....then the shifter forks inside the case are worn or damaged. I hope this helps.....start small and work your way up!

Jan 30, 2009 | 1989 GMC K2500

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