2010 w204 wont unlock with remote the next day !
#1
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?
#2
Senior Member
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?
#3
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.
#5
Super Moderator
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.
#6
Member
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
#7
Super Moderator
Never leave the key within communicating distance with the car or the battery will go flat. (Keyless go only)
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#8
Member
As I said, if I lock and unlock with the remote, it seems ok then
#12
AM works great. I dont have a spare key. And the tint has been there for more than 1 year.
#13
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.
#14
Super Moderator
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; 03-07-2014 at 08:55 AM.
#15
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; 03-07-2014 at 08:55 AM.
#16
Super Moderator
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.
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CaliBenzDriver (11-01-2023)
#19
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MY'14 W212 M276 3.5NA @60kMi
#20
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; 11-01-2023 at 06:45 PM.
#21
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MY'14 W212 M276 3.5NA @60kMi
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; 11-01-2023 at 10:43 PM.
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Chastity (11-01-2023)