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Discussion Starter #1
My C7 has alarms randomly about 2-3 times a day. Never in the night.

Thought it was water ingress, but no evidence found

Seems to trigger every 120-150 minutes without warning. Dealer is baffled. Car is still under 3/36 warranty

Its not movement, or the motion sensor. No codes either

Replaced hood sensor

Baffling.

Going in to the dealer for deep dive next week, but any experience from others will help.

Thanks
 

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Welcome to our forum jaa6921. I have never experienced any alarm issues with RedHot. Do you have anything hanging from your mirror or similar that could at times, be moved by air currents?
 

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Discussion Starter #3
Thanks RedHot - love the name

So under instruction from the GM dealer, everything is removed from the car including OBD2 module, GPS tracker on the battery, dangling heart on mirror etc

My local dealer does not sell so many Corvettes so they are scratching their heads on this one. Being still under warranty, its headed towards a Lemon situation if they don't fix it....................

Next week its going in for as long as it takes to fix it. They say they are going to replace door/handle switches, trunk latch and anything else that's identifiable as a potential way to set off the alarm. Personally after watching this for several weeks and relating it to the weather and temperature outside, I am of the opinion that there's a PCB with bad soldering in some piece of electronics and the cold and warm transition is causing the problem.

Its driving me mad!!
 

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Discussion Starter #4
FWIW

My Alarm went off 4 times in 3 hours whilst the car was parked at my office. These events were consistent with it being 70-72deg outside, which appears to be part of the circumstance that causes this to happen

Ironically enough I spoke to GM Customer Service and they instructed me NOT to take my car into the Dealership and that they are arranging some technical expert to come here and work with the dealer on troubleshooting the issue.

Guess when you get to call "Lemon" they start to get interested.

I really hope they fix the problem......

Aside from this - and again - if anyone can provide clues as to what causes this, please post!!
 

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Occasionally when I'm jacking up my 2014 and forget to have a key with me the motion of jacking it up sends off the alarm. I am scratching my head as well and if I think of something I will respond with a better reply. you triggered a situation I had 30 years ago working on medical lab equipment, we had a Technical service bulliten to repair a cracked solder joint that would cause the display screen to go crazy - had to travel throughout the nation for a quick 5 minute repair. I will continue to think about this but I like the idea of replacing the central unit responsible for receiving signals rather than all the door switches etc. Keep us posted, I will do the same if I get and idea.
 

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Discussion Starter #6
Hi Yellow n Red

Thanks for the input.

I agree that a bad solder joint somewhere could be the root cause - been there too in my work. Its definitely seems to be related to temperature change

Anyhow, the car is now at the GM dealership with GM Customer Service overseeing the process. I think that finding the root cause is going to be more luck and changing out parts, but at least the dealership is being given the time to work on it. I'm on a 2 week business trip so I won't see the car until early May and by then I hope they have got somewhere

I get the feeling that they will keep replacing parts until the problem goes away. Thats how they seem to operate these days.

Appreciate any feedback from this forum on where to look. I have been reassured that if the problem cannot be fixed then the car can be replaced. Not sure I want to go there, but its not much fun so far.

Thanks
 

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Discussion Starter #7
So now about 6 weeks into this problem and in the last week GM got connected to my car and state that the alarms are all related to a glass break sensor on the alarm - apparently this points to the rear windshield with the heated strips that act as a detector when the alarm is set.

There is no visible damage to any of the strips or side connections on the screen but should act as a warning to anyone having tint applied to be aware of this case the installer gets "happy" with his knife.

Aside from the fact that its taken so long to come up with a diagnosis, you would think that the dealers can look into the car deep enough to see this. GM have approved replacement of the rear screen under warranty and the part is on order and should be fitted next week. Hoping that my daily alarm sessions are going to end soon.

Just information for others who may experience this type of problem,
 

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Thanks for the update John. Glad GM is taking care of it for you. Probably took that long to isolate because it is a unusual cause.
 

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Hope you get back on the road soon.
 

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Discussion Starter #10
Here is an update that I hope helps others in the future

The alarm issue took 8 weeks to diagnose and fix. It took 6 weeks for the dealer to actually get GM online and into the car. On the same day the root cause of the alarms was identified. A new rear windshield was ordered and it took a total of 2 weeks to get that fitted. In fact the dealership use a local glass company to do that so it leaves me wondering why it took so long to schedule it.

Result is the alarm condition is solved and my ar is back to normal. All under 3/36 warranty. The bill for the windshield was >$1500

I definitely need extended warranty after 3/36......
 

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Thanks for the update John. Glad all is working now. :eek:nthego:
 
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