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awd not working


milk123
12-11-2005, 04:42 PM
I have a 2002 Olds Bravada with smart trac and it's not working.. I purchased this vehicle from the local dealer in August therefore at the time i coul'nt make sure the system worked..

After reading in this forum I've checked a few things and found that the ATC fuse was blown. I immediatly changed the fuse and did a road test. The AWD seemed to work for a moment but then stopped again .. When I returned home sure enough the fuse had blown again..


Anyone heard of this before and what am I in for??

milk123
12-11-2005, 07:55 PM
Update; Tried another fuse. Put it in drive and spun rear tires on ice and zap, another fuse blown..


Does this sound familiar to anyone??

Chris Stewart
12-12-2005, 08:02 AM
Update; Tried another fuse. Put it in drive and spun rear tires on ice and zap, another fuse blown..


Does this sound familiar to anyone??

Just a guess, you might try looking behind the transmission where the transfer case is and see if the wires are rubbing on the transfer case enough to short to ground. If not, then the encoder motor might be burned up.

milk123
12-15-2005, 01:33 PM
[QUOTE=Chris Stewart]Just a guess, you might try looking behind the transmission where the transfer case is and see if the wires are rubbing on the transfer case enough to short to ground. If not, then the encoder motor might be burned up.[/QUOTE



Dealer has oredered an encoder motor.. They think it may be the problem. Where exactly is that located on the vehicle? What does it do? Thanks. Dave.

Chris Stewart
12-17-2005, 12:06 AM
From what I've read, the encoder motor engages the front wheels through the transfer case...kinda like a servo if you follow model airplanes.

boldsmobile
12-17-2005, 09:21 PM
The motor is located on the transfer case and it enages the 4wd based on the speed difference between from and rear driveshafts. I had a frozen encoder and 4wd wouldnt work. replaced it for 180 and im good to go.



[QUOTE=Chris Stewart]Just a guess, you might try looking behind the transmission where the transfer case is and see if the wires are rubbing on the transfer case enough to short to ground. If not, then the encoder motor might be burned up.[/QUOTE



Dealer has oredered an encoder motor.. They think it may be the problem. Where exactly is that located on the vehicle? What does it do? Thanks. Dave.

milk123
03-31-2006, 09:10 PM
Guess what.. I had the encoder motor replaced on the 9th of January and noticed a couple of days ago that it was not working again. Checked the fuse and sure enough it was blown again.. I installed another fuse and spun the back wheels and the fuse went again right before my eyes.. Same as last time .. I took it back to the dealer today and they said the encoder motor was gone again .. They were very surprized .. They checked everything that had anything to do with it and said everything checked out.. Do you think I just got a bad part or could there be something else causing it.. thanks Dave

Chris Stewart
04-02-2006, 03:24 PM
Sure, some new parts do make it out of the process in faulty condition.
Cost cutting practices are getting out of hand.

ericn1300
04-03-2006, 06:41 PM
Guess what.. I had the encoder motor replaced on the 9th of January and noticed a couple of days ago that it was not working again. Checked the fuse and sure enough it was blown again.. I installed another fuse and spun the back wheels and the fuse went again right before my eyes.. Same as last time .. I took it back to the dealer today and they said the encoder motor was gone again .. They were very surprized .. They checked everything that had anything to do with it and said everything checked out.. Do you think I just got a bad part or could there be something else causing it.. thanks Dave


duplicate the experiment, see if you can kill the third one too. if you do kill it that would be an indicator that you might have another problem.

milk123
05-04-2006, 07:48 PM
You won't believe this.. It's happened again.. The dealer says that they have no idea what the problem is and they are now copping out by saying that there is no snow to work on it.. What B.S... I paid alot of money for this vehicle a couple of months ago and this is ludacris.. The salesman when asked by me if it was as good as 4x4, he answered: It's better than 4x4...

Chris Stewart
05-05-2006, 07:53 AM
If there's a plug to disconnect on the encoder motor, you might try unplugging it then install another fuse to be sure there's not a short in the car's wiring.
As far as required snow for AWD engagment, tell'em you're going camping with your family in no mans land with Eric's and will need AWD to get around.

milk123
05-13-2006, 12:16 PM
The sales and the service department ( both G.M ) are suppose to be meeting to see what they can come up with..

Chris Stewart
05-14-2006, 07:54 PM
Sounds like a stall to me, maybe a letter from your attorney...before the warranty time runs out just to have something on record besides what the dealer claims.

ericn1300
05-15-2006, 12:15 AM
As far as required snow for AWD engagment, tell'em you're going camping with your family in no mans land with Eric's and will need AWD to get around.

I can't believe you can't find snow or at least a good mud hole in Canada, we still have 50 inches of snow on the mountain 15 miles from here.

we usualy head to the high country to go camping in the first week of July, crossing a lot of water on the dirt roads in and finding some snow banks at the camp ground to stash our six packs in. gives a whole new meaning to "grab me a cold one". you're welcome to join us and put your rig, and arm, to the test.

do you know what you get when the head of sales and service have a meeting of minds... a perfect vaccum. if they have you bring it in for repair again and you have no way to test it, and they know it, do two things. first, mark the encoder motor or connector with a dot of paint or nail polish (i like passionate pink) to make sure they actualy change it. second, discreetly mark a tire with chalk when you park it at the stealership and take a digital pic of it and another of the odometer to see if they even move it, or test drive it (oh yeah we gave it a good work out) some stealerships are notorious for having you bring it in, waiting a few days and telling you it's done to wait you out in the hopes that you'll just go away or that the warranties will expire without even touching it.

do you know the difference between the sales reps at the stealership and the boy scouts? the boy scouts have adult leadership... and a code of conduct.

milk123
08-05-2006, 08:23 PM
Yesterday my service awd light started coming on .. Is there a way to check the code without going to the expensive dealer or buying a bunch of tools that i will probably never use again??

Chris Stewart
08-06-2006, 07:48 AM
Yesterday my service awd light started coming on .. Is there a way to check the code without going to the expensive dealer or buying a bunch of tools that i will probably never use again??


Sorry but yours requires a scan tool/code reader. The good part is it'll likely pay for itself in resetting the DTC's instead of the dealer or shop doing it.
One problem is what do you do about some codes?
For example you get a P0306...engine misfire on #6 cylinder, now you know #6 is missing but what is causing it to miss? That's where a factory service manual can guide you through some problems.
A $300 scan tool and $160 worth of manuals will pay off eventually if you're ready to devote enough time (which is getting shorter every day) to follow a few problems through.

milk123
08-09-2006, 06:10 PM
Where would you get a factory service manual???? I'd love to have one..

Chris Stewart
08-09-2006, 07:47 PM
Cool find....you're money ahead.
http://cgi.ebay.com/ebaymotors/2002-Chevy-TrailBlazer-Bravada-Envoy-SERVICE-MANUAL-SET_W0QQcmdZViewItemQQcategoryZ34216QQihZ013QQitem Z230009865700QQrdZ1

This scan tool connects your Bravada to a laptop..Win98 or newer.
http://cgi.ebay.com/ebaymotors/Windows-PC-Auterra-OBD-II-OBD2-2-Scan-Tool-Scanner-USB_W0QQcmdZViewItemQQcategoryZ43989QQihZ012QQitem Z220008857148QQrdZ1QQsspagenameZWDVW

It looks like a better deal than my Autotap because it says it handles all protocols.
Hopefully the Pros will step in now with their most valued opinions.:thumbsup:

milk123
08-09-2006, 10:18 PM
Re: the manual, only ship within the US. Re: the scan tool , a little pricey.. Any more help woud be great..

milk123
08-09-2006, 10:21 PM
Oh, by the way.. I may have just wasted $50.00 on an other repair manual. It's the Chilton repair manual for the 02'/03' Trailblazer/Bravada.. Anyone hve any feedback on this one???

Chris Stewart
08-10-2006, 11:43 PM
I stand up for the Chilton manuals. If you want to do the brakes, change the spark plugs or fuel/transmission filter, change the wheel bearings or clean the fuel injection..a Chilton book is a great value.
Some folks don't want to do the scan tool thing or fool with the ABS or Air bags and prefer to take their pride and joy to a most cool, trusted and respected professional.

milk123
08-11-2006, 08:45 AM
Thanks Chris, I guess i'll keep looking for a manual.

Chris Stewart
08-11-2006, 10:34 PM
Some chain type auto parts stores will scan your computer for free, just call around.

boldsmobile
08-23-2006, 09:20 PM
there is a separate computer to run the awd. its under the passenger side kick panel. it has in it some relays to test the motor at start up and this box actually does the motor engagement. i suppose its possible the relay is shorted and when it engages it blows the fuse. testing without the motor plugged in is a good idea but the self test at start up might know the motor is unplugged and disable the system. in case you didnt know motor is on driver side and is right next to the front drive shaft.

also the bravada doesnt use an encoder motor. the awd computer will engage this motor at speed difference between front and rear drive shaft and it will disengage unless it sees slip continue. i have taken this motor apart (at least on mine) and there was no encoder wheel in it. its a dumb motor (again on mine).

milk123
09-01-2006, 09:19 AM
Are there codes for the Awd light?

milk123
09-12-2006, 08:39 PM
My service Awd light is coming on regularly now so what should i do????

Chris Stewart
09-13-2006, 04:39 PM
If it's still under warranty, the dealer is obligated to make the repairs to your satisfaction. You need documentation of repairs not being made.
You might call a repair shop that gives free estimates, let them check it out (even if you have to pay for the computer scan) then copy that info and estimate, show the estimate to the dealer showing you now have documented the problem at this date...for warranty protection.
If they stall, consult with a lawyer for further action. Oldsmobile is out of business so who's gonna issue a recall on a defective AWD?
When the GM warranty time/milage runs out, you'll be just plain out of luck and any Smartrak issues will be your financial burden to bear...or start selling parts off it.

MT-2500
09-13-2006, 05:54 PM
Yesterday my service awd light started coming on .. Is there a way to check the code without going to the expensive dealer or buying a bunch of tools that i will probably never use again??

Get that code and post back code no..
You will need a transmission /engine capable scanner.
You may be able to rent one but it may be better to.
Find another dealer or a good repair shop.

Tip on going to the dealer
Ask that only a factory certified gasoline engine performance specialist work on your car.
Not all dealerships are concerned with how repairs are dispatched, and not all dealership techs bother to take advantage of the training offered by Factory(the vast majority of which is paid training). If the dealer is uncooperative, ask for your money back and call around for a dealer that will accommodate you.

Or tips on finding a good repair shop.
Check around Ask around
Word of mouth.
Family friends coworkers neighbors business people and delivery people.
Mailmen and parcel delivery people get around and notice a lot of stuff.
Even a good parts house knows what shops are good and not good.
Chamber of commerce and better business bureau and city hall.
If you find a good referral to a repair shop go look them over and talk to them.
Look for a clean looking busy place with nice people running it.
Ask a few questions and ask about their qualifications and training.
Not all places have trained tech/mechanics.
If they do not find a place that does.
Even all dealers do not have all trained techs/mechanics.

MT

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