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4 wheel drive is not responding

Tiny
COOKJD2610
  • MEMBER
  • 2002 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 171,000 MILES
I have a 02 trailblazer with 4 wheel drive problems granted it frustrating me. I had a scanner hooked up to it and its not responding I replaced the switch then the dash lights went out and I check the fuses in the hood since I cant find any fuse box in the cab can some one else help me please cause I need the 4x4 for winter.

I checked the sensors and there is no power I checked all the fuses and they are fine. This is really making me mad

i got the dash lights back on so know all I have to worry about is this 4wd it seems like trailblazers have issues with 4wd problems I had a 99 chevy s10 zr2 and it had 4wd problems I think chevy needs to relook at this known problem and recall them all.

No there is no power to the actuator. I turn the new switch and nothing happens I checked the power to the actuator and there is no power at all. Fuses are good
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Tuesday, November 23rd, 2010 AT 1:53 AM

26 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
There is three fuses that run the 4 wheel drive system. Here is the wiring diagrams so you can see how the system works I would test for power at the fuse and at the transfer case controller.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (Below). Please let us know what happens.

Cheers
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Monday, December 6th, 2010 AT 5:46 AM
Tiny
COOKJD2610
  • MEMBER
  • 6 POSTS
I switched up all the relays and fuses nothing
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Thursday, December 9th, 2010 AT 4:41 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Then we need to move back to the switch. Are you getting power to it?
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Thursday, December 9th, 2010 AT 4:45 PM
Tiny
COOKJD2610
  • MEMBER
  • 6 POSTS
Ok when you move the switch no lights come on at all like the light is supposed to come on and tell you what drive its in right but the words light up when the headlights are on but there is no lights on the top no at all indicating im about ready to just give up on this pos
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Friday, December 10th, 2010 AT 2:29 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
There is no power getting to the switch. I just looked at a schematic of the system. According to the schematic, there is a 15 amp fuse in the rear fuse block below the left rear seat. Did you check that? Also, under the hood at the fuse block, there is a black / white wire which is a ground. Check to see if it is in good condition.

I have attached a schematic. Even though you can enlarge it, I don't know if you will be able to read it. Let me know if you checked there for the fuse.

Electrical problems can be a pain so I understand your frustration. What even makes it harder for me is not being there. Hang in there, and we'll get it figured out.

Joe
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Friday, December 10th, 2010 AT 3:02 AM
Tiny
COOKJD2610
  • MEMBER
  • 6 POSTS
The fuse is good in the rear and same with the ground wire no corrosion still nothing. I do really thank you for helping me through this. I wish I had a car lift make it easier to get under it instead of jacking it up then climing under it lol.
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Saturday, December 11th, 2010 AT 1:12 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
I'm glad to help. I just wish I could make it easier for you. Is there power to the rear fuse? I ask so we can limit the number of things that need checked. Something tells me we have a broken wire between that fuse and the switch.
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Monday, December 13th, 2010 AT 5:54 AM
Tiny
COOKJD2610
  • MEMBER
  • 6 POSTS
I did the light test for power I dont no if it check to make sure the fuse is good or if there is power. I have the power tester but I dont no how to use it :( I can have my neibor check it for me he nows how to use one. I hope theres not a broken wire. Ill let you know what the resolt was on the rear fuse im going to have him check all the fuses to the 4x4 maybe im missing something and used the wrong tester.
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Tuesday, December 14th, 2010 AT 7:03 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Not a problem. Let me know what you find. It sounds like the transfer case controller is out here is its location tey a used one.

Joe
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Tuesday, December 14th, 2010 AT 7:17 PM
Tiny
COOKJD2610
  • MEMBER
  • 6 POSTS
Thanks for the tip I got s used one from my buddy who has a bunch of parts for these cars and it worked! I am ready for the snow. :) Thanks again
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Friday, December 17th, 2010 AT 7:46 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help

Cheers
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Sunday, December 19th, 2010 AT 12:48 AM
Tiny
BUDFAN8
  • MEMBER
  • 1 POST
  • 2005 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 70,000 MILES
Had to lock it in 4 wheel drive yesterday it whent in fine and got me out of the muddy parking lot I was in. Flipped the switch to go back to 2 wheel drive and the warning light on the dash came on the one with the wrench beside the drive train and the lights that indicate what it is in 4 high 2 high and such blinks for awhile in each position and then completly goes out. The next day light was out when I started it and the light blinking for the 4 wheel drive selector did the same thing now no light on 4 wheel drive selector and light is staying on on dash. HELP HELP HELP
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Sunday, April 7th, 2019 AT 9:03 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Chances are there is a problem with the actuator on the transfer case. Have you checked for power to the actuator?
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Sunday, April 7th, 2019 AT 9:03 AM (Merged)
Tiny
HGRILK
  • MEMBER
  • 2 POSTS
  • 2003 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 65,000 MILES
The range switch won't put the trans into the 4x4 LOW range - it switches back and forth between 2WD, AWD, & 4x4 HIGH, but won't shift into 4x4 LOW - the light just blinks then stops and the 4x4 HIGH liight stays on - HELP
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Sunday, April 7th, 2019 AT 9:03 AM (Merged)
Tiny
DENNYP
  • MECHANIC
  • 1,824 POSTS
Put the transmission shifter in neutral. Then, try and shift into 4WD low. The transfer case won't go into 4 low unless the transmission is in neutral.
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Sunday, April 7th, 2019 AT 9:03 AM (Merged)
Tiny
HGRILK
  • MEMBER
  • 2 POSTS
I've done that - I have 71K miles on it - bought it new - never had a problem getting into 4x4 low - it tries, light blinks, but never shifts. Like the solenoid is stuck or somthing.
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Sunday, April 7th, 2019 AT 9:03 AM (Merged)
Tiny
DENNYP
  • MECHANIC
  • 1,824 POSTS
You will need to remove the encoder assembly and manually try to shift it into 4 low. If it goes in, your problem is in the encoder circuit. If not, you need to teardown the transfer case for inspection.
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Sunday, April 7th, 2019 AT 9:03 AM (Merged)
Tiny
BILLK
  • MEMBER
  • 16 POSTS
  • 2008 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 50,000 MILES
The stabilatrak light occasionally comes on and stays on (not during a traction problem). Shutting the vehicle off and turning it back on clears the problem. What could be causing this? Also the other night due to icy and snowy road conditions I switched the 4WD switch from 2H to Auto. The auto light blinked for an extended period of time and then went out. I tried other modes and the same thing happened. No indicator lights for any of the drive modes were on, but a red N was on next to the 4L position. I have never seen this before. The vehicle was in 2H and seemed to work fine. I shut the vehicle off several times and restarted it but none of the indicator lights were on and the red N was still on. I continued to my destination. I was there about one and a half hours. When I started my vehicle the 2L indicator light was on and I could change my drive mode. Looking for answers to what caused this and remedy for both of these problems. Are the two problems possibly related. Also does the red N indicator normally signify the transfer case would be in neutral?
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Sunday, April 7th, 2019 AT 9:03 AM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan for codes first see why it doing what it is.
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Sunday, April 7th, 2019 AT 9:03 AM (Merged)
Tiny
BILLK
  • MEMBER
  • 16 POSTS
Scanned for codes. There are no codes stored.
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Sunday, April 7th, 2019 AT 9:03 AM (Merged)

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