Trunk keeps popping open
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Intermediate
Joined: Jul 2015
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Trunk keeps popping open
So today I washed my car with a pressure washer and everything was fine until I got home. I pulled my 97 into the garage and started cleaning down the rest of the drips left over. Then my trunk popped open. I maybe thought I hit the key fob but the battery has been dead in the fob for 3 weeks now. So I shut the trunk 15 sec later pops open again. It keeps doing this!! Has anyone ever experienced this problem?
Thread Starter
Intermediate
Joined: Jul 2015
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Its a base 97 c5 with the hatch. It stopped doing it but I would still like to know what cused the problem. I'm guessing water got somewhere and it made it trip.
Melting Slicks
Joined: Nov 2014
Posts: 3,399
Likes: 1,339
From: Havre de Grace Maryland
This may not be the reason but I thought I would share. It could be someone in your neighborhood that has a device that is on the same frequency of your trunk’s frequency. Unlikely, but possible. Does the trunk lid come up away from your residence? If not and only does it in your driveway, then it increases the chances someone’s devise is triggering it. I know it can occur. On a business trip when I locked the rental car (chev) by the key fob, it set off someone’s BMW alarm. Over the next few days, I had a great time watching the owner go crazy.
Thread Starter
Intermediate
Joined: Jul 2015
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This may not be the reason but I thought I would share. It could be someone in your neighborhood that has a device that is on the same frequency of your trunk’s frequency. Unlikely, but possible. Does the trunk lid come up away from your residence? If not and only does it in your driveway, then it increases the chances someone’s devise is triggering it. I know it can occur. On a business trip when I locked the rental car (chev) by the key fob, it set off someone’s BMW alarm. Over the next few days, I had a great time watching the owner go crazy.
Le Mans Master
Joined: Sep 2014
Posts: 5,278
Likes: 539
From: Kelowna BC
My 2 guesses:
1-rrwirsi has a remote that works on your hatch and is playing games with you
2-You're not closing it all the way. Next time you close it try opening and shutting the door (with windows closed) and see if it pops open from the pressure. If so, it simply isn't closing fully.
1-rrwirsi has a remote that works on your hatch and is playing games with you
2-You're not closing it all the way. Next time you close it try opening and shutting the door (with windows closed) and see if it pops open from the pressure. If so, it simply isn't closing fully.
Burning Brakes
Joined: Dec 2011
Posts: 858
Likes: 75
From: Medford, Oregon
You are not the lone ranger with this issue. This happens with mine once in a blue moon and it might be due to battery voltage drops. This week end I was standing by my car and it sounded like the door solenoids started clicking on their own, I thought that maybe it was my FOB. Still haven't figured out what the source of the issue is yet. My trunk does the same thing, check your FOB battery as well or try re-training your FOB's. Please post the fix if you find the problem. 
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Instructor
Joined: Jul 2015
Posts: 144
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From: DE
Ive had the phantom lock unlock in the past... It was based on a failed remote that was sending signals while it was in a draw in the house. Had to pull the battery out of the remote to prevent it. Did you pull the batteries out of your remote just to be sure?
Thread Starter
Intermediate
Joined: Jul 2015
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You are not the lone ranger with this issue. This happens with mine once in a blue moon and it might be due to battery voltage drops. This week end I was standing by my car and it sounded like the door solenoids started clicking on their own, I thought that maybe it was my FOB. Still haven't figured out what the source of the issue is yet. My trunk does the same thing, check your FOB battery as well or try re-training your FOB's. Please post the fix if you find the problem.
Thread Starter
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My remote is at home and I'm at work with just the key and it happend at work I just shut it again. Let's hope it stays shut
Burning Brakes
Joined: Dec 2011
Posts: 858
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From: Medford, Oregon
At 7:15, moments ago I went and put a fresh battery(FOB) in and went thru the FOB training sequence and everything seems normal at this time. I will wait a couple of days and re-post, but it seems to have been the Fob battery, who knows and time will tell !! 
Thread Starter
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Hours. So I have a feeling its the key fob. Can you send a link how to reprogram the fob please?
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I don't think so I worked night shift last night and it didn't pop open besides once .I got in the car and put the the key in the ignition and when the car is in park the passenger door and truck are unlocking I pulled my ebrake and put the car in drive shut the trunk and took off. Everything was fine getting home. I will see if it pops open at all agim when I wake up. Very weird situation it just started happening after I washed the car. I have a feeling water got someplace where it wasn't suppose to get.
Le Mans Master
Joined: Jan 2004
Posts: 9,488
Likes: 1,743
From: Knoxville Tn
Try removing the wires from the release switch in the dash,
You could do the same at the release point in the trunk, but then I'm not sure how you'd open it when you need to. It does sound like an electrical bug running around.
I guess since it's a coupe, you could crawl back there in the hatch area and attach and reattach the release wires in the trunk area from the inside the car.
You could do the same at the release point in the trunk, but then I'm not sure how you'd open it when you need to. It does sound like an electrical bug running around.
I guess since it's a coupe, you could crawl back there in the hatch area and attach and reattach the release wires in the trunk area from the inside the car.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
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From: Columbia SC
I don't think so I worked night shift last night and it didn't pop open besides once .I got in the car and put the the key in the ignition and when the car is in park the passenger door and truck are unlocking I pulled my ebrake and put the car in drive shut the trunk and took off. Everything was fine getting home. I will see if it pops open at all agim when I wake up. Very weird situation it just started happening after I washed the car. I have a feeling water got someplace where it wasn't suppose to get.
If the passenger side cowl drain udder is clogged you will dump water in that area.
Thread Starter
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I will do that when I get home. I think that's what it is because its such a weird issue. But it did not pop open from 7am-7pm yesterday I drove my daily to work today so when I get home I'll see of the trunk is poped. Hopefully the BCM dried off fine haha. Thanks your for input!