When my AWD light comes on is has always been due to uneven pressure in the tires. This is hard to believe but has worked up to now and I have 95K miles on it. It started happening around 60K. Changing the tires is another option. I would have the brakes checked if you have a noise from the rear end.
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The HZDL fuse in the console fuse block supplies battery positive voltage to the normally open stoplamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to both left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The CHMSL is grounded at G301. The left stop lamp is grounded at G401 and the right stop lamp is grounded at G402.
Fuse Block - Center Console
Inside of console, behind the right console access panel
There was a recall on this, see your local Chevrolet dealer....
NOV 01, 2004
2003 Chevrolet Trailblazer
ON CERTAIN SPORT UTILITY VEHICLES, VIBRATION AND HEAT MAY CAUSE THE TAIL LAMP/STOP LAMP BULB TO LOOSEN IN ITS SOCKET. IF THIS OCCURS, THE BULB MAY FLICKER AND EVENTUALLY BECOME INOPERATIVE.
AN INOPERATIVE BRAKE LAMP WILL NOT CONVEY THE DRIVER'S INTENTION OF STOPPING TO DRIVERS IN FOLLOWING VEHICLES, AND AN INOPERATIVE REAR TURN SIGNAL LAMP WILL NOT CONVEY THE DRIVER'S INTENTION TO TURN TO DRIVERS IN FOLLOWING VEHICLES. BOTH OF THESE FAILURES CAN INCREASE THE RISK OF A CRASH.
DEALERS WILL INSPECT THE TAIL LAMP/STOP LAMP ASSEMBLIES, AND IF NECESSARY, REPLACE THEM. THE RECALL BEGAN ON NOVEMBER 22, 2004. OWNERS SHOULD CONTACT CHEVROLET AT 1-800-630-2438, OLDSMOBILE AT 1-800-630-6537, BUICK AT 1-866-608-8080, OR GMC AT 1-866-996-9463.
Potential Units Affected:
GENERAL MOTORS CORP.
Read more: http://www.motortrend.com/cars/2003/chevrolet/trailblazer/recalls/#ixzz2jWJ1eDyR
Reinflate your tires to the proper pressure and this usually goes away. I have had this quite a few times and the dealers will try to talk you into all sorts of problems that they can fix and replace stuff including rear ends for $$$. Do you even go places where all wheel drive is that important? It has never caused a real problem in mine.
The fluid in the versatrakAWD in the rear is old and needs to be drained and refilled. After you drain and refill it, make a bunch of sharp left and right hand turns, then drive it for 10 minutes. Drain and refill it for the second time and problem solved. Use only versatrak fluid available at any GM dealership.
Really a lac of info, but do check the exhaust. Is the noise when you put the peddle to the metal, or easing off??? And what sort of sound?? 1/ shake your teeth out,2/shakes the whole car, 3/just annouying? Please help us help you! Frankster016