2010 w204 wont unlock with remote the next day !
Thread Starter
Newbie
Joined: Feb 2014
Posts: 6
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2010 c300
2010 w204 wont unlock with remote the next day !
Hey Im new to the forum !
This is whats been happening to my w204 2010 C300. I lock the car at night and when I go the next day and try to unlock with the remote it wont do anything. If I get out the metal key and open it with that, the alarm will start to beep. And after that the remote works perfectly, to lock and unlock.
Any ideas?
This is whats been happening to my w204 2010 C300. I lock the car at night and when I go the next day and try to unlock with the remote it wont do anything. If I get out the metal key and open it with that, the alarm will start to beep. And after that the remote works perfectly, to lock and unlock.
Any ideas?
Senior Member
Joined: Feb 2007
Posts: 447
Likes: 4
From: Orange County.CA
12E350, 12ML350, 08C350
Hey Im new to the forum !
This is whats been happening to my w204 2010 C300. I lock the car at night and when I go the next day and try to unlock with the remote it wont do anything. If I get out the metal key and open it with that, the alarm will start to beep. And after that the remote works perfectly, to lock and unlock.
Any ideas?
This is whats been happening to my w204 2010 C300. I lock the car at night and when I go the next day and try to unlock with the remote it wont do anything. If I get out the metal key and open it with that, the alarm will start to beep. And after that the remote works perfectly, to lock and unlock.
Any ideas?
Thread Starter
Newbie
Joined: Feb 2014
Posts: 6
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2010 c300
Thats the first thing i did. Yesterday i left it unlocked. And today the remote wouldnt do anything. Lock or unlock. I opened the car and it started as usual. After that the remote worked perfect again. There are no stored codes.
Super Moderator
Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Have you had your car windows tinted recently? What is your radio reception like ~ especially AM? The remote uses the same antenna in the rear window. How does your spare key operate?
Have your car's battery properly load tested.
Have your car's battery properly load tested.
Member
Joined: Jan 2014
Posts: 188
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From: Baltimore, MD
2018 E300 Luxury w/P2
My C300 is a week old and I have Keyless go. Sometimes it wont unlock and sometimes the dash tells me key not found when I try and start
So far, whenever I lock or unlock with the remote all seems ok
So far, whenever I lock or unlock with the remote all seems ok
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Never leave the key within communicating distance with the car or the battery will go flat. (Keyless go only)
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Member
Joined: Jan 2014
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From: Baltimore, MD
2018 E300 Luxury w/P2
As I said, if I lock and unlock with the remote, it seems ok then
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Thread Starter
Newbie
Joined: Feb 2014
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2010 c300
AM works great. I dont have a spare key. And the tint has been there for more than 1 year.
Thread Starter
Newbie
Joined: Feb 2014
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2010 c300
This morning as usual the car wouldnt open with the remote. So i tried something a friend told me to do. I pressed the trunk lid´s handle or switch, like if was going to open the trunk. And after that the remote works perfectly again. Its like the system was asleep and it woke up when i pressed the trunk switch, the alarm did not activate like when opened with the metal key.
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Joined: Jun 2008
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
You might just have answered your own question. The Canbus is supposed to go to sleep & awaken when you open the drivers door etc. However the remote lock/unlock is supposed to remain active & wake up the Canbus with a push of the key button. Sounds as though the whole system is sleeping.
Have your battery checked. Low voltage can cause all manner of gremlins. If the battery is OK you need to get the car onto a Star to check out the Canbus. Quiescent & wake up.
Have your battery checked. Low voltage can cause all manner of gremlins. If the battery is OK you need to get the car onto a Star to check out the Canbus. Quiescent & wake up.
Last edited by Glyn M Ruck; Mar 7, 2014 at 08:55 AM.
Thread Starter
Newbie
Joined: Feb 2014
Posts: 6
Likes: 0
2010 c300
You might just have answered your own question. The Canbus is supposed to go to sleep & awaken when you open the drivers door etc. However the remote lock/unlock is supposed to remain active & wake up the Canbus with a push of the key button. Sounds as though the whole system is sleeping.
Have your battery checked. Low voltage can cause all manner of gremlins. If the battery is OK you need to get the car onto a Star to check out the Canbus. Quiescent & wake up.
Have your battery checked. Low voltage can cause all manner of gremlins. If the battery is OK you need to get the car onto a Star to check out the Canbus. Quiescent & wake up.
Last edited by Glyn M Ruck; Mar 7, 2014 at 08:55 AM.
Super Moderator
Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Yes to the first part of the question. No it's not an option - With a Star they can detect the various states of the Canbus & if there is a Canbus short etc. The EIS is the top of the control pyramid. Lets hope the issue is not there.
anyone knows what was reason?
Out Of Control!!
Joined: Apr 2019
Posts: 11,921
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Junior Member
Joined: Oct 2016
Posts: 24
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C300
As for my problem, it was my key fob. Even after changing the battery, it didn't respond. What's peculiar is that whenever I opened the car manually with the key, the alarm would sound as expected. But even after getting inside and pressing the lock button to deactivate the alarm, the door's unlock button still wouldn't respond so I thought it was some circuit issue within the vehicle.
But when I tried the spare key fob, voila! It functioned perfectly!
Last edited by Chastity; Nov 1, 2023 at 06:45 PM.
Out Of Control!!
Joined: Apr 2019
Posts: 11,921
Likes: 6,770
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
simplification
Thanks for getting back. It appears no one has ever shared their follow-up solutions here.
As for my problem, it was my key fob. Even after changing the battery, it didn't respond. What's peculiar is that whenever I opened the car, the alarm would sound. And even after getting inside and pressing the lock button to deactivate the alarm, the door's unlock button still wouldn't respond so I thought it was some circuit issue within the vehicle.
But when I tried the spare key fob, voila! It functioned perfectly!
As for my problem, it was my key fob. Even after changing the battery, it didn't respond. What's peculiar is that whenever I opened the car, the alarm would sound. And even after getting inside and pressing the lock button to deactivate the alarm, the door's unlock button still wouldn't respond so I thought it was some circuit issue within the vehicle.
But when I tried the spare key fob, voila! It functioned perfectly!
- You unlock the car,
- all locks pop up nicely
- you open the door to get in...
- then the alarm honks at you, thief!!
- It's unlocked but the alarm still triggers
That's how I got interested! I took my new MB apart piece by piece like my first bicycle....
I found simple solutions for DIY'ers to cancel chaos for freee
Here it sounds like the Electronic Ignition Switch (EIS) is seeding chaos >>> Solder iron + Reboots prove good medicine.
Last edited by CaliBenzDriver; Nov 1, 2023 at 10:43 PM.
