[SOLVED] OK mechanics,plz help. No start,crazy gauges - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 06-08-2010, 08:03 PM
wmcpss wmcpss is offline
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2003 Chevy TrailBlazer LT EXT
Magnetic Red Metallic 4.2L I6 2WD
Join Date: Jun 2010
Location: al
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OK mechanics,plz help. No start,crazy gauges

I have a '03 trailblazer LT EXT with the inline 6, loaded except for sunroof.
My wife was driving a couple of weeks back and the engine died. After pulling over it started back. That happened a couple of more times. Then when getting in to start, the gauges would go crazy, moving wildly before going normal, sometimes it would then start and sometimes not.
Now it will not start at all. The engine will not turn over, gauges move wildly, and also sometimes displays 'service brake system'. The airbag and brake lights also stay on even when the gauges go back to normal position.
Some of you are mechanics and I have read posts that say bad ignition switch. This may be my case as well, but what about the brake message?
Do any of you think this is one in the same?
I have been doing my own repairs for over 20 years and can do so if I can find the problem, I have checked all wiring as best I can, swapped batteries and cleaned posts and grounds and reseated and checked fuses.
Any help from you guys would be appriciated, on any problem that is even close to this one to give me ideas.
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  #2  
Old 06-08-2010, 08:56 PM
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Dshow Dshow is offline
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2003 Chevy TrailBlazer LT
Indigo Blue Metallic 4.2L I6 4X4
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My '03 TB LT acted very similar and it was the ignition switch... (It was still under warranty, so I didn't troubleshoot the car myself...) If you have a voltmeter and a wiring diagram, it should be easy to see if it's the key switch.
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Old 06-08-2010, 09:00 PM
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RayVoy RayVoy is offline
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2009 Chevy Avalanche LTZ
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ignition switch. We have a "how-to" change thread on here, try the search function.
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Old 06-08-2010, 09:08 PM
wmcpss wmcpss is offline
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2003 Chevy TrailBlazer LT EXT
Magnetic Red Metallic 4.2L I6 2WD
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Thanks Dshow, I am keeping watch for new posts, need to get repaired asap.
I have the voltmeter, but no diagram. Just removed the console and looked at the ignition switch, did not remove but wiggled it a little with no results after turning key on and off several times, even when the gauges settle down I get no start but the service brake message did not come up on these tries.
Waiting for more replies.
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Old 06-08-2010, 11:58 PM
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the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
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For $30, try this first, then report back any lingering symptoms.

https://forums.trailvoy.com/showthread.php?t=61278

Assume you don't even hear the starter relay click?



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  #6  
Old 06-09-2010, 09:13 AM
wmcpss wmcpss is offline
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2003 Chevy TrailBlazer LT EXT
Magnetic Red Metallic 4.2L I6 2WD
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OK, I will give the ignition switch replacement a try, I was leaning that way anyways after reading so many posts about them going bad.
No, I do not have any starter relay clicking. There is one relay that can be heard to click under the rear seat fuse/relay box when the key is turned to the 'crank' positon.
Do any of you know a good place on the web to buy a relay, ebay is a given, but if someone knows a quality site please let me know.
Thanks Guys.
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Old 06-09-2010, 11:08 AM
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the roadie the roadie is offline
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Relays are cheap enough I always go to my local parts store.



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  #8  
Old 06-09-2010, 12:55 PM
wmcpss wmcpss is offline
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2003 Chevy TrailBlazer LT EXT
Magnetic Red Metallic 4.2L I6 2WD
Join Date: Jun 2010
Location: al
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Thanks for the info guys. I had not yet checked to see if it is a part avalible or a dealer only item. I will check wth my parts store.
If anyone else has had a similar problem and found the fix please reply, I am still watching the posts for new info. (even though it seems that the switch is the likely problem).
Also the link you sent roadie was great info. Great job to the guy who posted that.
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  #9  
Old 06-10-2010, 03:18 PM
wmcpss wmcpss is offline
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2003 Chevy TrailBlazer LT EXT
Magnetic Red Metallic 4.2L I6 2WD
Join Date: Jun 2010
Location: al
Posts: 5
Solved!

Installed new ignition switch today and it fired right up, no problems. Thanks to all of you who gave your opinion, the info on getting the gears on the switch right was very helpful because the new one was not in the same position, I got it right first try.
For future refference with others that may have this problem, he is a list of the symptoms I had caused by that switch,
* Engine shut off while driving, after pulling to side of road it started back.
* Gauge cluster needles go crazy when key inserted to on position.
* Chimes would not sound after key turned to on position.
* Starter relay and starter would not activate, ( would not crank ).
* With key in on position after trying to crank, no chimes, seatbelt light on, airbag light blinking.
* Displayed "service brake system" message a couple of times.
* Gearshift park locking relay would not release when brake petal depressed.
* All other electrical functioned properly, lights, windows, radio, a/c, seats...

This appeared to be a ground or short condition to me, but was caused by a bad ignition switch, ( Advanced Auto Parts lists it as a 'Igniton starter switch' ) so again thanks for all the help from you guys.
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  #10  
Old 07-14-2010, 12:43 PM
rsjohnson1979 rsjohnson1979 is offline
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2003 Chevy TrailBlazer LTZ
Forest Green Metallic 4.2L I6 4X4
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my problems were a bit different. abs light, parking brake light, airbag light and service 4wd light. When all those lights come on simultaneously, it flashes unknown driver across the DIC. i get no errors when hooking it up to a diagnostic. But that is only mechanical issues right? not electrical. So today i replaced the ignition switch like everyone, including my mechanic, suggested. Still does the same thing. Gears are right. key turns, engine fires and it runs and drives. Has never died on me, just crazy guages and the above mentioned dash problems. Any new Ideas on what it could be? Would be greatly appreciated!!
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