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Chevrolet TrailBlazer Electrical Problems

104 messages,  Last post on Nov 12, 2009 at 1:36 PM

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#1 of 104 02 Trailblazer Electrical Probs.PLease Help!!! by robbyr Nov 12, 2007 (10:01 pm)
HI I have an 02 Trailblazer,..I am now having some weird problems and was hoping someone might have some insight to help me on this forum. Truck was running fine,..I use my truck for work. So I take things out of the back of my Tailgate all day long. Well it started when I opened my tail,..and I looked at the dash and I had lights on and the radio went off? Well when I slammed the tail..the lights went off on the dash and the radio came back on. So then a day came when it started raing...thats when the all the idiot lights came on in the dash.. The car continued to run and the speedomter worked, but the power windows did not, neither did the gas gauge,oil,battery,air conditoner,power locks and back wiper. or radio. Next day the rain stopped and everything worked fine. Now its only when it rains..I lose power to everything I just mentioned but the headlights and tailights still work.      I had someone put it on a computer to get the codes, the codes go to the tailgate control module. Not the one behind the driver seat..but was told its the one in the tailgate itself.      I then had someone who had access to a Tec 2 ( GM Tool) see if it would come up with anything. They said they found the errors...but the Tool could not communicate with the Tailgate Module??My question here is has anyone had this kind of problem,..and do you think it sounds like the tailgate module is the problem....or is there somewhere else I should check before I spend the money on a brand new tailgate module??The thing that is fishy is that i was told that the body control module ( behind the drivers seat) controls some of those idiot lights,..and the tailgate module controls the others? I had the Tec 2 communicate with the body control module and it couldnt communicate with the rear tailgate...which is why I am so pluzzled? One GM Mechanic told me to put in a new ignition switch as thay have that problem all the time at the dealership..so I did...still have the problem? Anyone?? thanks in advance -Robb Replies to this message: burdawg (Nov 13, 2007 6:36 am) robbyr (Nov 13, 2007 2:57 pm) burdawg (Nov 14, 2007 6:20 am)
#2 of 104 Re: 02 Trailblazer Electrical Probs.PLease Help!!! [robbyr] by burdawg Nov 13, 2007 (6:36 am)
Replying to: robbyr (Nov 12, 2007 10:01 pm) Since you use the tailgate a lot, and the problem first occurred when you were opening/closing it, have you checked the wiring harness between the body and the tailgate? Replies to this message: robbyr (Nov 13, 2007 2:57 pm) burdawg (Nov 14, 2007 6:20 am)
#3 of 104 Re: 02 Trailblazer Electrical Probs.PLease Help!!! [burdawg] by robbyr Nov 13, 2007 (2:57 pm)
Replying to: burdawg (Nov 13, 2007 6:36 am) I did check the harness. I opened the rubber seal and pulled out the wires harness to look for a split coating on any of the wires or a splitwire...everything looked fine?? The next day...is when it started happeneing more often. And now I am stuck with anytime there is any rain....or if I am out and it starts to rain...in a matter of minutes " Bam"...the lights come on the dash and I lose power to the windows and radio, airconditoner. When it first started happening it was once in a while but ever since I opened the harness up,.. it now happens like clock work. Replies to this message: burdawg (Nov 14, 2007 6:20 am)
#4 of 104 Re: 02 Trailblazer Electrical Probs.PLease Help!!! [robbyr] by burdawg Nov 14, 2007 (6:20 am)
Replying to: robbyr (Nov 13, 2007 2:57 pm) If that's the case then it's possible the harness is still the problem, but in an area you can't see, like at a connection point. Since it happens during wet weather and became worse after checking the harness then I think I would try to find out where the connectors are for that rear harness and inspect them for corrosion or other contact problems.
#6 of 104 Chevrolet Trailblazer Battery Replacement by cernst2 Nov 14, 2007 (11:34 am)
I have a 2003 Trailblazer EXT that required a battery replacement today (Surprise, suprise, Gomer!) ... Now, the radio doesn't work, the interior lights won't come on and there are a couple other non-functioning electrical devices.   Is there a reset button or something that I missed? Replies to this message: tblazed (Nov 15, 2007 7:17 am) leblanc5 (Jan 02, 2009 12:23 pm)
#7 of 104 Re: Chevrolet Trailblazer Battery Replacement [cernst2] by tblazed Nov 15, 2007 (7:17 am)
Replying to: cernst2 (Nov 14, 2007 11:34 am) Sounds like either the BCM got glitched during the battery change since it controls the things you mentioned, or maybe the 125 Amp "Mega Fuse" on the underhood fuse block got blown somehow since it supplies power to the interior and most of the accessories, maybe frrom someone hooking up jumper cables wrong? (Been known to happen before). I would check that big 125 A fuse, and if it's good (12 Volts on each end of the fuse) then try disconnectiing the battery for 35 minutes to reset everything, reconnect the battery and try again.
#8 of 104 Extended Warr... by blazerburn03 Nov 16, 2007 (11:54 am)
Hi there does anyone have legal advise on how to get the previous owners to reinstate the extended warranty... I have a 2003 TB love it, but the engine light stays on, it went off but it keeps coming back on, and it has a vibration at 45 to about 60, I tried several things for the light but it keeps coming back on.. the previous owners told me that the light never came on while they drove it, and that they were not aware of the vibration while its so damm obvious.. I was doing the extended warr. transfer over to my name since it had almost 1 more year left on it, and I was going to take advantage of the extended warr to have the dealer find the problem... but the previous owner told me i could change the extended warr to my name w/out any problems... but to my dismay they canceled in Oct . I got the truck from them on the 18th of oct.and at that time they told me it was active and I could have transfered over. so does anyone know if I have any recourse againts the previous owners.. or am I out of luck... I called them, so now is just a waiting game to see if they will even call back, since I am financing the truck thrugh the credit union maybe they can do something about it?? since the light keeps coming on, or is it basically I am out of luck, I bought it as it was so I may be stuck with a lemon.....   any ideas or comments....... Replies to this message: matuner (Dec 14, 2007 6:28 pm)
#10 of 104 Computer nightmare by matuner Dec 14, 2007 (6:28 pm)
Replying to: blazerburn03 (Nov 16, 2007 11:54 am) 2002 TrailBlazer. I had left my 4 ways on for about 20 minutes. Upon shutting them off my truck went dead. I had to boost it. it ran. The next day I had to boost it as well. It ran for 30 minutes then I went to drive away and I had 2 lights on, a engine light with an arrow pointing down and the transmission light. My truck idled at 1100rpm but when I gave it gas it would not accelerate. It goes into gear but does not move. No fuses have blown and all gauges read accordingly. What is wrong? Can I fix it by unpluging my battery for 35 minutes?

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