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2014 CTS-V; 2010 Escalade ESV
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464 Posts
Discussion Starter · #1 ·
I find that when I open my trunk to put something in there and close it, when I go to open my door, the trunk pops back open again.
This happens only after I open and close the trunk.
Fairly reproducible.
I'm not terribly bothered by it.
Just curious if anyone else has the same problem...
 

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2009 CTS-V Black/Black, manual
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1,371 Posts
Last time I had weird stuff like that happening, I was carrying my fob around in a pocket that had other stuff like another vehicle fob and keys in it, etc. Finally assigned the Caddy fob to it's own personal, (clutter-free), pocket, and all gremlins disappeared. Just sayin .....

Rob
 

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1975 Seville; 2004 CTS V; 2011 CTS V Coupe
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806 Posts
I have the same experience. However, after shopping and safely 'securing' my expensive purchases in the Trunk, we usually stop for dinner at a Restaurant. Upon return to the car, Ah Ha! The trunk is raised, OPEN.
So far, all of my valuable purchases, expensive Air Compressor, etc. remain in tact. Sincere thank you to the honest people.
More fun is had as I carry a large load of Groceries up our split level stairs and hear the Security System activation of the continuous Horn Honking.
I have arrived at a similar conclusion; the Cadi V Key Fob reposed with others in my pocket is probably activated upon egress from the car. I remain blind as I pass by the raised Trunk Lid. :annoyed:
Rearranging my Key Fob carrying habits.:yup:
 

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I too have had numerous bogus key operations (open trunk, alarm, etc.) all of which are obviously due to buttons on the remote being pushed while in my pocket. It should be noted that, unlike some other cars, the trunk on the 2009 and later CTS-V does not open noticeably (only enough to disingage the lock), so unless you see the message in the DIC or physically check it when out of the car, you are very unlikely to know that it is unlocked. I keep the remote in a pocket by itself with other keys in a key case and it still happens, Solution? Don't carry the remote on your person or be more careful.
 

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2011 "BD" CTS-V, 2010 CTS-V (Traded), 2007 Escalde (Sold)
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283 Posts
I find that when I open my trunk to put something in there and close it, when I go to open my door, the trunk pops back open again.
This happens only after I open and close the trunk.
Fairly reproducible.
I'm not terribly bothered by it.
Just curious if anyone else has the same problem...
Same happens to me. Open trunk...close trunk...grab drivers door handle...TRUNK RE-OPENS. Weird and does not make sense. Also, PITA to get out and close it after getting in the car. Has to have a fix.
 

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2014 CTS-V; 2010 Escalade ESV
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464 Posts
Discussion Starter · #9 · (Edited)
I too have had numerous bogus key operations (open trunk, alarm, etc.) all of which are obviously due to buttons on the remote being pushed while in my pocket. It should be noted that, unlike some other cars, the trunk on the 2009 and later CTS-V does not open noticeably (only enough to disingage the lock), so unless you see the message in the DIC or physically check it when out of the car, you are very unlikely to know that it is unlocked. I keep the remote in a pocket by itself with other keys in a key case and it still happens, Solution? Don't carry the remote on your person or be more careful.
You are absolutely correct about the trunk only unlocking and not swing wide open. Sometimes the only way I know the trunk is opened is the warning in my instrument cluster.
I thought about the Key Fob issue. But what does not make sense is that the trunk would re-open only when the door is opened.
You would think that if it was truly the Key Fob, the trunk would open randomly and should not be triggered by anything in particular...

Not knowing how the Key Fob actually works, I would imagine that there is an unique wireless "fingerprint" for each car/fob.
What I don't know is whether the doors and trunk each have their own distinct signal, or the car itself has one common "fingerprint".
If the doors and trunk have their own distinct identifier, then maybe the wavelength (?) may be close enough that opening one might trigger the other.
What seems more likely is that the car as a whole has a single "fingerprint", and when activating the door, there is probably some sort of power surge that triggers the trunk lock mechanism as well.

God, I'm such a fricken dweeb...
 

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1975 Seville; 2004 CTS V; 2011 CTS V Coupe
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806 Posts
When approaching within a few feet of the car, the Key Fob establishes a radio frequency sync link as a permissive for your programmed door unlock/lock, personalized seat and steering wheel positioning, etc.
The manual Lock/Unlock, Trunk Open and Security Alarm function at a greater distance.
Door handle execution affecting TRUNK OPEN does not ring any bells for me! :crying:
My job of 33 years required me to evaluate peculiar electonic signals (successfully) but does not awaken my intuition here.
Possibly a Sync Door OPEN status confirmation signal back to the Key Fob thus activating programming erroneously within the Key Fob to open the TRUNK.:cookoo:
 

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05 SRX; 09 V
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273 Posts
Could be some wiring harness problem with the door since the trunk unlock button is in the door, and opening it seems to have something to do with the problem. Probably not though.
 

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Tuner car fanatic..there all good!
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I get it on occassion, (four times in about 3 months) so not with any consitency.

When I open trunk at the driver's door, then go back close the trunk and then touch the key pad on drivers door again to get in.
 

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Any of the buttons on a FOB operate at a much greater distance (at least 30 ft.) than the automatic door unlock does. This is because the receivers for the automatic function are good for only about one meter (approx 39 in.). The receiver for the in-car operations is located in the center console. This is why the owner's manual tells you to place the FOB in the special pocket in the console when the battery is weak. This is as close to that receiver as you can get without removing it from the console.

Each FOB has a unique numeric code that it transmits to the car when a button is pushed. This is why new FOBs must be programmed. When this code is recognized, the requested function is performed. It has nothing to do with close frequencies or anything like that.

One poster referred to the "key pad on the drivers door"..."to get in." I am familiar only with the three-button keypad on the inside of the driver's door, which can only be reached if you are already in or by reaching through the open driver's window.
 

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1975 Seville; 2004 CTS V; 2011 CTS V Coupe
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806 Posts
Take a breath. '.. ...referred to the "key pad on the drivers door"..."to get in."
Speaking in broad terms, the TRUNK OPEN button is positioned where the person who is most likely to operate it will be the Driver.
Most often, the only person in the car (first entering; last egressing) will be the Driver. Predominantly operated controls wil be in proximity to the DRIVER.
The first mechanism to fail is the Driver's door Window operator and controls since it experiences the most frequent manipulation.
Sir. I have read the Owners Manual - thoroughly. I agree with you and the Design Engineers, in that I want the Automatic Door UNLOCK to function when I am in very close proximity to the car, ensuring my personal safety whereby a stranger will not gain access to my car before me. KEY FOB button functions are appreciated at a greater distance to light my way and signal actions.
I programmed the DIC so that only the Driver-side door will auto UNLOCK with special consideration to my wife's safety, should she be driving alone; no stranger can enter the Passenger side door unannounced.
 

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2010 CTS-V (Silver over Black Recaros)
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322 Posts
I do this every day on my way to and from work: Approach car with fob in front pants pocket. Open trunk (usually by touching the pressure button between the license plate lights without hitting any button on the fob). Drop in briefcase. Close trunk. Open driver's door (by pulling on the door handle and not by pushing any button on the fob). Get in, start up, drive off. Not once in the hundreds of times I've done this have I ever experienced the trunk (or any other portal) unlocking or opening again. I'd say that if you've eliminated all sources of unintentional pocket-contents actuation of the fob buttons and this is still happening to you, then you have an electrical gremlin worthy of dealer attention under warranty. What people are describing here is very clearly not supposed to happen.
 

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2011 CTS Premium 3.6L DI in Thunder Gray.
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70 Posts
has any one found a dealer that knows what the problem is. Just got my car back today after several modules being replaced and a key fob re-learn. My trunk still pops open. My dealer also called Cadillac and Cadillac says they have only herd of 2 CTS cars that have ever had the problem. I think mine is number 2. Thanks
 

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2017 Camaro ZL1; 2011 CTS-V sedan; 2004 Lightning
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Mine does the same thing. Just verified that, as with others here, it only happens if I first open and close the trunk, then open the driver's door.
 

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2011 CTS-V
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x3 mine too. open trunk with button by the plate, close trunk, open door- Pop, trunk re-opens. I replicated this with the fob in my hand- it is NOT accidental activation. If after opening the trunk, I manually lock the car with the FOB and then manually unlock with the FOB, then it doesn't happen. It really makes me nuts.
 

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2017 Camaro ZL1; 2011 CTS-V sedan; 2004 Lightning
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Still happening. I have verified that it is not being caused by accidentally pressing a button on the keyfob. My scenario is:
  • Car set to autolock
  • Manually open trunk, either with driver's door button or with pad on trunk handle
  • Close the trunk
  • Open the driver door
  • Trunk pops open
I haven't taken the time to change things up and investigate further, i.e. does it happen with autolock enabled if I manually unlock the door with the fob; does it happen with autolock disabled, does it happen if a different door is opened, etc.

I suspect that Cadillac has only heard of this happening on two CTS-Vs because the other owners haven't reported it, or their dealers haven't called it in. Feels like a software bug to me.
 
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