Service 4 wheel drive light on dash
#11
![Default](/forum/images/icons/icon1.gif)
1. Press 4 HI LOCK button.
2. Wait for 2-3 seconds, until TC Motor will change your settings and flashing light on 4HI LOCK became permanent.
3. Press 4HI button.
4. Wait for 2-3 seconds until TC Motor will change your setting back( Listen for the sound of TC motor).
5. Repeat this procedure at least 20-30 times.
If your problem in this case, so it should help to fix it.
Do it when your truck is not moving.
Good luck.
#12
![Default](/forum/images/icons/icon1.gif)
So when You press button wait for 2-3 seconds and you could hear how your Transfer Case Motor is changing your setting from 4HI to 4HI LOCK or from 4HI LOCK to 4 HI. You can see how your buttons light will blink several times on the new button( 4HI LOCK, for example) and after"will be permanent. So it means that your transfer case settings changed already. After that, in 2-3 seconds, you could switch it back to 4HI button that same way.
1. Press 4 HI LOCK button.
2. Wait for 2-3 seconds, until TC Motor will change your settings and flashing light on 4HI LOCK became permanent.
3. Press 4HI button.
4. Wait for 2-3 seconds until TC Motor will change your setting back( Listen for the sound of TC motor).
5. Repeat this procedure at least 20-30 times.
If your problem in this case, so it should help to fix it.
Do it when your truck is not moving.
Good luck.
1. Press 4 HI LOCK button.
2. Wait for 2-3 seconds, until TC Motor will change your settings and flashing light on 4HI LOCK became permanent.
3. Press 4HI button.
4. Wait for 2-3 seconds until TC Motor will change your setting back( Listen for the sound of TC motor).
5. Repeat this procedure at least 20-30 times.
If your problem in this case, so it should help to fix it.
Do it when your truck is not moving.
Good luck.
#13
![Default](/forum/images/icons/icon1.gif)
This switching of buttons is working just for 4HI LOCK button and back to 4HI. If you try to do it for 4LOW LOCK it will not switch in that mode, but in my case, when I switched from 4HI to 4HI LOCK and back lights first were flash but after became permanent. Try one more time. Light in 4HI LOCK should flush and after that be permanent. If it doesn't work, it means that something wrong probably with Transfer Case.
#14
![Default](/forum/images/icons/icon1.gif)
This switching of buttons is working just for 4HI LOCK button and back to 4HI. If you try to do it for 4LOW LOCK it will not switch in that mode, but in my case, when I switched from 4HI to 4HI LOCK and back lights first were flash but after became permanent. Try one more time. Light in 4HI LOCK should flush and after that be permanent. If it doesn't work, it means that something wrong probably with Transfer Case.
If this doesn't work, how extensive and expensive is fixing or a new transfer case?
Is the car safe to drive to a mechanic?
http://www.buyautoparts.com/autoparts/Hummer/H2/Transfer_Case_Encoder_Motor.html
Last edited by Dakota25; 02-05-2015 at 09:35 PM.
#15
![Default](/forum/images/icons/icon1.gif)
You should press middle button, second from the top. It said: 4HI LOCK on it. Don't touch round one. It's rear differential lock button! Also don't switch and touch to the lowest button! So, just press second button with 4 HI LOCK and after 5 seconds press back the first from the top button: 4HI. You should see how lights should change from one button to another one. Is it any clinging noise coming from your Transfer Case when you are driving?
#16
![Default](/forum/images/icons/icon1.gif)
You should press middle button, second from the top. It said: 4HI LOCK on it. Don't touch round one. It's rear differential lock button! Also don't switch and touch to the lowest button! So, just press second button with 4 HI LOCK and after 5 seconds press back the first from the top button: 4HI. You should see how lights should change from one button to another one. Is it any clinging noise coming from your Transfer Case when you are driving?
#17
![Default](/forum/images/icons/icon1.gif)
Be sure that you are driving in 4HI mode! It means that your first from the top light should be on(4HI)! Don't drive in normal road conditions if your Transfer Case setting in 4HI LOCK and your middle button light is on right now! In this case your can damage your transmission, because this setting is just for severe off- road conditions( deep snow, sand, mud etc.) But if your TC settings in 4HI mode (light is on your top button 4HI- normal road conditions) and your warning message( Service 4WD) on your DIC( Driver's Information Center) disappeared, so it should be fine. Normally this message still could stays on for some period of time after you did those "30 Switches"and after next time you stop and start your engine should disappear from your dash board.
#18
![Default](/forum/images/icons/icon1.gif)
Be sure that you are driving in 4HI mode! It means that your first from the top light should be on(4HI)! Don't drive in normal road conditions if your Transfer Case setting in 4HI LOCK and your middle button light is on right now! In this case your can damage your transmission, because this setting is just for severe off- road conditions( deep snow, sand, mud etc.) But if your TC settings in 4HI mode (light is on your top button 4HI- normal road conditions) and your warning message( Service 4WD) on your DIC( Driver's Information Center) disappeared, so it should be fine. Normally this message still could stays on for some period of time after you did those "30 Switches"and after next time you stop and start your engine should disappear from your dash board.
#19
![Default](/forum/images/icons/icon1.gif)
After each switch wait for 5 second( during that time you can hear how TC Motor is changing your TC mode from 4HI TO 4HI LOCK) and after that change it back. Repeat this procedure about 20-30 times.
#20
![Default](/forum/images/icons/icon1.gif)
Holy smokes! Here I am reading this post in Sept 2022......Seven years after this post.
I have a 2008 H3 and my "Service 4WD" just came on. I followed the instructions here (switch from 4Hi to 4 LOCK) multiple times (I did it 20 times) and guess what???
The message on my dash was no longer there once I turned car back on !
yippee!
Thanks buddy from 7 years ago for your wise advice!
I don't know if you are still on this forum but THANK YOU!
I have a 2008 H3 and my "Service 4WD" just came on. I followed the instructions here (switch from 4Hi to 4 LOCK) multiple times (I did it 20 times) and guess what???
The message on my dash was no longer there once I turned car back on !
yippee!
Thanks buddy from 7 years ago for your wise advice!
I don't know if you are still on this forum but THANK YOU!
I had the same problem several years ago. And when I came to very knowledgeable mechanic so he fixed it for me for free and he told me how to fix it by myself in future if problem will come back: Try to play with your 4Hi and 4HI LOCK buttons, pressing them one after another one to let your transfer case motor to switch mode of transfer case from one to another one. You should do it when your track is not moving( you can do it even during long red light waiting on intersections!) and you should do it at least 20-30 times pressing buttons back and forth letting TC Motor to change mode for transmission. That mechanic-guy told me that it's a "Rule of 30 switches". When you do this procedure your TC motor start to work again and clean some residue this way, that could stay on the rotor and electric brushes of TC Motor after it didn't work for long period of time. So when your TC Motor do it for about 20-30 time, changing modes from 4HI to 4HI LOCK and back it could fix your problem! But be sure that your truck is STATIC and it's not moving during that procedure!
After one or two years this problem with DIC message:"Service 4WD"came back and I fixed it right away with this procedure!
I hope that it could help you for free! By the way, that mechanic guy was former GM specialist and employee!
Try it! And good luck!![Wink](https://www.hummerforums.com/forum/images/smilies/wink.gif)
After one or two years this problem with DIC message:"Service 4WD"came back and I fixed it right away with this procedure!
I hope that it could help you for free! By the way, that mechanic guy was former GM specialist and employee!
Try it! And good luck!
![Wink](https://www.hummerforums.com/forum/images/smilies/wink.gif)
Thread
Thread Starter
Forum
Replies
Last Post
Mgarman
PRIVATE For Sale / Trade Classifieds
5
03-30-2015 09:50 PM
tbraly
PRIVATE For Sale / Trade Classifieds
0
04-19-2014 08:36 AM
Caraddict
PRIVATE For Sale / Trade Classifieds
8
10-09-2013 04:59 PM
rhinomike
PRIVATE For Sale / Trade Classifieds
4
05-15-2013 10:33 AM