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Chevy Silverado and GMC Sierra Electrical and Computer Questions

354 messages,  Last post on Nov 20, 2009 at 11:13 AM

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What is this discussion about? Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Truck

#312 of 354 Re: 1993 Chevy Cheyenne [kb52] by canayjun64 May 11, 2009 (7:08 am)
Replying to: kb52 (May 11, 2009 6:10 am) kb52...I had a similar issue with my 94 Concorde. It turned out to be a cold solder on the display control. By banging the display slightly, I was able to re-gain control of the temperature temporarily. It was a bit tricky to find but with the help of a magnifying glass, I was able to locate the problem and fix it.   Who knows...it might be just that. Good luck!
#313 of 354 chevy silverado 2500 1989 by johnny_t Jun 03, 2009 (4:25 pm)
I have a old but well kept silverado from -89 it is a 6.2 diesel, and everything is working just smoothly. the "service car soon" lamp is lit, and i would like to know what the warning lamps indicates. therefore i am looking for a owners manual on the internet, but seem to find only for newer models. anybody know where to find this? i actually bought the heyes manual, but cannot locate it there, Regards J Replies to this message: canayjun64 (Jun 04, 2009 3:17 am)
#314 of 354 Re: chevy silverado 2500 1989 [johnny_t] by canayjun64 Jun 04, 2009 (3:17 am)
Replying to: johnny_t (Jun 03, 2009 4:25 pm) johnny_t.... did you tray a Haynes manual? Thet are quite good. Try this link.   http://www.haynes.com/products/year/1989/make/Chevrolet/model/Pick-Up/productID/- - 246   I've been using them fo all of my vehicle I owned and they are very helpful.
#315 of 354 Turn Signal/Back up Light 2007 Silverado by bob2007chevy Jul 28, 2009 (2:52 pm)
I have a new body style 2007 Silverado, quad cab. When I use my left blinker, my blinker and my back up light both blink. After a few moments, the blinker blinks very fast. I changed the bulbs. I have over the 35,000 miles on the truck. Any suggestions? Replies to this message: obyone (Jul 28, 2009 3:13 pm) seabeemax (Jul 28, 2009 6:24 pm) ffkc120 (Aug 17, 2009 3:09 pm)
#316 of 354 Re: Turn Signal/Back up Light 2007 Silverado [bob2007chevy] by obyone Jul 28, 2009 (3:13 pm)
Replying to: bob2007chevy (Jul 28, 2009 2:52 pm) Take it back to the dealer before your factory warranty is up. Replies to this message: seabeemax (Jul 28, 2009 6:24 pm)
#317 of 354 Re: Turn Signal/Back up Light 2007 Silverado [obyone] by seabeemax Jul 28, 2009 (6:24 pm)
Replying to: obyone (Jul 28, 2009 3:13 pm) Have you changed any wires on the pig tail
#318 of 354 2k Sierra / alarm keeps going off by whatnxt Jul 29, 2009 (5:43 pm)
The alarm in my 2000 Sierra went off and I couldn't stop it no matter what I did. I used the remote and the key to no avail since this would only stop it for a few minutes to a few hours, then it would go off again and the only way to stop the noise was to disconnect the battery. I tried for a couple of weeks to figure it out myself but was not able to resolve anything. This was in mid June   I finally took it to an alarm specialist and they checked the truck out from top to bottom and concluded that the problem was not with the aftermarket alarm the dealer had installed but with the factory alarm that came with the truck. I did not know they were separate but still functioned with the one remote. He showed me by changing the sound in the aftermarket alarm, then triggered the alarm in different ways to activate first one then the other. This was possible because the factory alarm doesn't have motion sensors, but is activated by the opening of the doors and such. By doing this I was able to distinguish the two alarms going off by their different sounds, with the factory alarm sounding the horn while the aftermarket sound was a siren. They did all this so that I could take the truck home and the next time the alarm went off I would know which one had gone off by the sound, i.e. the horn or siren. That night the alarm went off and just as he said, it was the factory alarm since the horn sounded and lights flashed. I disconnected the battery and next day called the alarm place. He said they would not be able to help me since they only worked on aftermarket alarms because the factory alarms are tied into the BCM which he thought needed to be reprogrammed in order to fix the problem. He said it was a computer problem not a physical problem (as in wiring) and for this I needed to take it to the dealer.   The following week I took the truck to the dealer and explained everything that had occurred and the information from the alarm specialist. Dealer had never heard of this problem. He said they would look into it and call me when they had any information. Next day I got a call and was told that they needed it for one or two more days. Two days later I was called and told that all physical components were okay, and that the problem was with the BCM. BCM was replaced, I took the truck home, and unfortunately, the alarm just went off last night again. Will be contacting the dealer again.   This is also an answer to post #30, #221, and #260. I will keep you informed as I find out additional information. If anybody can help, please answer. Thanks. Replies to this message: obyone (Jul 31, 2009 8:22 am) whatnxt (Jul 31, 2009 5:39 pm) obyone (Aug 01, 2009 4:02 pm)
#319 of 354 Re: 2k Sierra / alarm keeps going off [whatnxt] by obyone Jul 31, 2009 (8:22 am)
Replying to: whatnxt (Jul 29, 2009 5:43 pm) I took the truck home, and unfortunately, the alarm just went off last night again.   Which alarm?   When did you install the aftermarket alarm?   Which remote are you using?   If I'm not mistaken, the aftermarket alarm also ties into the BCM. Replies to this message: whatnxt (Jul 31, 2009 5:39 pm) obyone (Aug 01, 2009 4:02 pm)
#320 of 354 Re: 2k Sierra / alarm keeps going off [obyone] by whatnxt Jul 31, 2009 (5:39 pm)
Replying to: obyone (Jul 31, 2009 8:22 am) The factory alarm is the one that keeps going off, and the aftermarket alarm was installed when I bought the truck. I am the original owner. They are both intergrated into the remotes. The way I understand it, both are programmed to the remotes you get when you buy the truck but are still two separate alarms that can function as one. I was told by both people that worked on it that the main alarm will always be the factory one and that only the dealerships can work on them because of the programming issue, since it's tied into the BCM. Aftermarket companies do not and will not touch the BCM. This also means that if you ever need a new remote you have to get it from the dealer because it has to be programmed to that vehicle via the BCM. This leaves me and anyone else with this kind of problem at the mercy of the dealers. That is unless someone out there can help with new info. Thanks for the response. Replies to this message: obyone (Aug 01, 2009 4:02 pm)
#321 of 354 Re: 2k Sierra / alarm keeps going off [whatnxt] by obyone Aug 01, 2009 (4:02 pm)
Replying to: whatnxt (Jul 31, 2009 5:39 pm) The dealer installed the aftermarket alarm when you originally bought the truck?   Sounds like something is shorting to ground as in bad wiring.

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