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Smart Trunk opening in the night

EdP

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bubbaG80Sport

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I'll take you up on it. Once declared "fixed" how long do you want to wait and see if it is really fixed?
Wiring that only shorts out in the middle of the night? Only in the driveway? I'm skeptical.
@EdP Consider bet taken and your hand shaken. The bet is payable after a fix and the issue does not re-occur for 1 month.

@onmark - Lets us know when and what fixes your trunk issue so we can determine who has "bragging rights".
 

TurtleBoy

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No Genesis Yet!

Aurally

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When I read the messages last week that it might be fixed, I withheld my opinions, thinking that it would only bear mentioning if it happened again. Now that it did, here is my Occam's razor theory:

To me, the easiest and simplest way to open the trunk would be through the emergency release latch inside the trunk. It's purely mechanical and bypasses just about everything, providing a mechanical shortcut to disengage the latch. I discounted this possibility after reading that the latch has been replaced. It seems the emergency release is built right into the latch, but there might be a possibility that they are separately replaced. It may be worth checking it to make sure it doesn't require featherweight to operate it.

Thinking along the same line, perhaps a critter found a way into the trunk, and was smart enough to nibble on the release latch? The glow in the dark paint on the release hatch would make it obvious for the critter as well as intended humans. My test would be to tape up the emergency release hatch so it's hard to trigger. If a human would ever be trapped during the test, the tape could still be removed by said person.
 

surprisinguy

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I installed an aftermarket alarm in one of my cars 20 years ago. EVERY single time I activated the alarm with the keyfob it would open my neighbor's garage door across the street. (he tried fixing the latch... didnt work :) ). Never told him, I just made sure it was armed by locking the doors, not just arming the alarm. I could make it go up and down as much as I wanted.
 

In-House Bob

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I had a 1970 Ford Maverick that had a horn that would start blaring in the middle of the night when the temp went below 60 or so. No matter what I did I could not get it to stop doing it so I finally put a little switch in the line to turn of the power to it at night and then when I went to drive it I would engage it. Drove the neighbors crazy. LOL
Ha! My '73 Pinto did the same thing. The little copper strip in the horn mechanism would bend in the cold and make contact. I didn't know it was happening (in the apartment complex parking lot) until one morning I found a note from the police saying they had disconnected my battery in the night. I just bent the copper tap out a bit and it was better.
Not sure that this would work on this trunk release 🆒
 

Speeder

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Way back I had a 1975 Porsche 914. Whenever it got really cold the engine cover would open and would't latch until I defrosted the release cable. Never replaced the cable but I suspect it had water inside the sheath.
______________________________
 

WPB

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"Light dimming that works sometimes, sometimes it doesn't dim, Cruise control that floors the pedal when you push reset, and Blue tooth dropping paring." With these problems, in addition to the trunk makes me think of bad ground(s) somewhere or even something called "floating grounds".
 

onmark

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One caveat, the last time the trunk opened and filled with ice, a newly installed garage door opener activated as well, opening the garage door a quarter of the way. Off to the dealer this morning, but not optimistic.
 

WPB

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That coincidence points to an RF trigger. Outside possibility is transient voltage spikes in the power grid. Any other "funny" electrical things happen in your home? Any lightning on the nights these things happen?
______________________________
 

In-House Bob

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I have my money on Poltergeist.
______________________________
 

Mr. Incredible

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Last edited:

bubbaG80Sport

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The possibility of 2 transmitters (key fob/garage opener), coincidentally not maliciously, transmitting the same rolling code multiple times in the same geographical area to 2 receivers (car/garage opener) repeatedly is highly unlikely. If people think this is likely they should buy a lottery ticket, play golf and stay indoors. You are more likely to win Powerball, hit a hole in one and get struck by lightning on the same day.

It is more likely the transmitter/receiver implementation was done incorrectly/poorly. For example the auto engineer may have chosen to use a byte to store/calculate the rolling code which reduces the number of possible codes to 256.

Rolling codes, implemented correctly, mitigates the risk of a replay attack (capturing current code and re-using).

The likelihood of a transmitter randomly sending the correct next rolling code accidentally consistently is VERY low.
Short of an intentional/malicious Rolljam/man in the middle type attack or poor implementation it is highly unlikely this is an RF problem.

The best way to test this is to reseed/re-sync the key fob and car. I don’t know if this is technically feasible in the G’s.
 

Mr. Incredible

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bubbaG80Sport

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That is a cause and effect argument fallacy. Turning on my windshield wipers does not mean it caused it to rain.
 
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