Question about 2002 Chevrolet Blazer

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Wiring diagram 4wd switch doesn't work. In 2wd all the time. Need wiring diagram or solutions

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  • Chevrolet Master
  • 3,103 Answers

Check fuses..

Posted on Jan 02, 2014

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Posted on Jan 02, 2017

csmock132
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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

  • 33 Answers

SOURCE: I have a 2003 chevy blazer LS, 2-door 4wd w/

try putting in nuetral and then shift into high gear . if still does not work sounds like the 4x4 acctuator is bad

Posted on Jul 01, 2009

kd6rhd56
  • 400 Answers

SOURCE: S-10 Blazer 4wd problem

www.amazon.com/Chiltons-Repair-Manual.../0801981425


Hope this helps you

Posted on Jul 12, 2009

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2 Answers

I have a 93 jeep Cherokee, it will move in 4wh and in 4wl but will not go back into 2wd?


Hello guy
try posting what 4wd system you have,? first.
command trac or select track, (the latter is full time)
part time or the full time system,
we cant guess it....
read the operators guide first, if a part time system only
as i suspect, stop driving on dry pavement.
it's only for ice, or dirt. part time. part time is not a full time system.
Command-Trac
shifting to 4wd on dry (means no ice) pavement causes, drive line wind up! and the gears to lockup. (see steering get tight in turns?> and is dangerous to drive it like this , you, me and the box)
posted here 100s of times.

http://www.rubicon-trail.com/4WD101/driveline-bind.html


the non grand Cherokee. early

had these choices
  • 1987-2001: New Process NP231 Command-Trac, part-time only, 2.72:1 ratio with low range
NP231 has the following settings: 2HI, 4HI, N, 4LO
  • 1987-2001: New Process NP242 Selec-Trac, full-time or part-time, 2.72:1 ratio with low range
NP242 has the following settings: 2HI, 4 full-time, 4 part-time, N, 4LO


as you can see you need to first know, what NP box you have or
photo your shift lever for 4wd, an post it and we tell you.

more facts, on select trac. (totally unlike command trac)
Selec-Trac locking hub is used on 4WD Cherokee. Selec-Trac
utilizes a non-disconnect front axle. Engagement of 2WD or 4WD is
accomplished at transfer case by means of mechanical shift linkage.
System allows full or part time 4WD. Selec-Trac can be shifted into
2WD or 4WD modes from inside the vehicle at any speed.
unquote
next from the service manual,
4WD TO 2WD
1) Place mode select switch in 2WD position. Transfer case
should shift to 2WD and not allow shifting into 4WD or LO range. Axle
should shift after transfer case shifts.
2) To determine if front axle has completed a shift out of
4WD into 2WD, position mode select switch back to 4WD position while
operating vehicle at slow speed. If vehicle shifts into 2WD, axle will
ratchet. If shift is not completed, transfer case will shift into 4WD
and hissing sound will come from mode select switch.
end quote.

if unsure read the FSM book its free.
shows you both systems and how to diagnose it.

in the box, click Cherokee,,then click 1993, and behold.
the real deal.

http://www.morris4x4center.com/knowledge-base/index.htm?utm_source=cj#service

4e7ebed4-9c81-4927-b26e-02808a82acff.jpg

May 10, 2016 | Jeep 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

2 Answers

Got. A 2003 f150 4x4 got problems with 4 wheel drive locking in and stay in drive shaft turning front wheels not


Operationally vacuum shifts the front axle between 2WD and 4WD mode. The GEM ( Generic Electronics Module ) applies ground to the solenoid needed for the mode selected on the switch ( for ESOF ) or when the transfer case shift lever is moved ( MSOF ).The contact plates in the transfer case signal the GEM that the transfer case is engaged, and the Vacuum solenoids need to be activated ( either 2WD to 4WD or 4WD to 2WD ).

Lift and support the front of the truck so the front wheels are off the ground ( take safety precautions, chock wheels, jack stands, etc )
Key on, engage 4x4 and try to turn the front drive shaft.
- If it turns it is a problem with the transfer case.
- If it doesn't it is a front axle engagement problem ( this is what you seem to have, the transfer case is engaged and will drive the front shaft mine was a key on engine off test ).

- If the front drive shaft does not turn :
•With the truck running ( with front wheel back on the ground ), switch from 2WD to 4WD and back again, the vacuum shift motor should move the lever on the front axle.
sscullys_185.jpg
-- If the vacuum shift motor does not move:
1.Check for vacuum on the lines while shifting between modes. Pink vacuum line is 2WD mode, Light Blue vacuum line is 4WD.
2.Check the fuses for the 4WD system and the solenoids.
3.Check the vacuum lines from the vacuum shift motor to the solenoids on the firewall.
sscullys_187.jpg
4.Check the vacuum lines from the solenoids to the vacuum reservoir box behind the battery.
5.Check the vacuum reservoir box for cracks.
6.Typical solution is the vacuum lines ( to the solenoids or to the vacuum shift motor ) are cracked or the vacuum shift motor has a cracked diaphragm and has water in it.
7.Could be the shift plate contacts in the transfer case are corroded / not making good contact, and not activating the solenoids.
sscullys_186.jpg

Usually the case is cracked vacuum lines from the solenoids, the next common is a cracked vacuum reservoir box, and 1 time I have seen the mount for the vacuum disconnect motor broken ( motor floating free so it could not push against the axle )
sscullys_188.jpg

Aug 28, 2011 | 2003 Ford F150 Regular Cab

1 Answer

How to get a push button four wheel 96 jimmy out of four wheel drive


take the switches 2wd 4wd hi 4wd lo out of the dash and unplug them all then use small wire to jump the 2wd connectors then replace new 4wd button and new 2wd button

Mar 16, 2011 | GMC Jimmy Cars & Trucks

1 Answer

Four wheel wont disengage. had switch for 4x4 set to 2wd and the light switched to 4wd while driving down the road and the four wheel drive engaged. Tried to switch from 2wd to 4wd and back but didnt...


if it is a turn knob that puts it in 4x4.then a wire under the truck is touching the exhaust pipe making it do this. I had this happen to mine. It will be 2 wires so they more and likely came loose.

Feb 12, 2011 | 2004 Dodge Ram 1500

1 Answer

I just bought a 2004 grand cherokee V8 for my son. It has 4wd but the stick slides easily between 4wd all the time, Neutral and I'm wondering if that means it's not working? The whole point of buying was...


Not sure what you mean by "4wd all the time, Neutral".
But I can tell you how it's supposed to operate.

The three modes are 2wd, 4wd high and 4wd low. When switching between 2wd and 4wd high it makes no difference whether the Jeep is moving or in neutral. The only condition that needs to be obseved when switching from 2 to 4 high is the speed of the Jeep. It should not be done above 45mph.
The switch from 4wd high to 4wd low is a different animal. The Jeep must be stopped and in neutral. Also you should be aware that it is not a pleasant sound or feel when moving from high to low so you should worry to much about the lowed junking sound.
At times it may even be necessary to put the lever back to the high position and move the Jeep a couple feet to align gears before it goes into low.

This is the reason for the relative ease when switching from 2wd to 4wd high.
There is an art to switching from 2wd to 4wd high then to 4wd low. Once your son becomes familiar with the Jeep and begins using the different modes it will become easier.
I would like to add one more piece of advice. After building Jeeps for over 25 years and owning several I have found that 8 out of 10 times that 4wd low is used, it's used incorrectly or not needed at all. It's a good idea to find someone who has experience with 4wd to give a bit of instruction on how it should be used. Especially in the mountains.
Let me know if you need any clarification on anything.
I hope this helps.

Oct 13, 2009 | 2004 Jeep Grand Cherokee

1 Answer

Switching back 4WD to 2WD - 1998 Jeep Cherokee 4L Limited Petrol


With any 4WD like this, always move a few feet in the opposite direction when disengaging. If you were moving fwd in 4wd, switch to 2wd, back up a few feet, then go fwd.

Jun 30, 2009 | 1998 Jeep Cherokee

1 Answer

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.

Jan 29, 2009 | 1995 Chevrolet K1500

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