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Trunk won't open with the door closed

2015 C300 with keyless entry

With the door locked, the trunk normally opens without an issue.

However, now I have to unlock the door to open it.

Is there any switch I need to turn to get back to normal (trunk open without the door open)?

Thanks

Do you have the key on your person? With the doors locked, the trunk won't open unless you have the key on you.

Yes, the key is in my pocket. It used to work fine.

The remote and the button on the driver side door can open the trunk.

I can't find any setting or switch :(

Checked 2 places:

Glove box. The switch is at open position

Settings of the locking system. All doors are unlocked.

Below is the picture of the trunk. There is a green light blinking in the middle. I can't find any other switch

https://cimg4.ibsrv.net/gimg/www.mbw...727fd0eeb1.jpg

Did you find the solution? I'm in the same boat. I can't open the trunk by hand while all doors are locked even if the smart key is in my pocket. The trunk opens if I press the trunk button on the smart key, but not by pressing the trunk lid by hand.

Quote:

Originally Posted by realeric (Post 7683316)

Someone mentioned taking the start engine button out and using the fob to turn over the engine. This should re sync the fob. Worth a try.

Quote:

Originally Posted by GreekUPS (Post 7683364)

Someone mentioned taking the start engine button out and using the fob to turn over the engine. This should re sync the fob. Worth a try.

I tried several methods. I'm not sure what was the culprit but it's solved. Your comment helped me a lot. Many thanks. What I did,

1. Remove the start button in the ignition.
2. Insert the smartkey into the ignition. (do not turn)
3. Press and hold the lock button with one finger. (do not release the button)
4. Press unlock button five times with another finger while pressing the lock button.
5. Release the lock button.
6. Remove the smartkey and put the start button back.
7. Start the engine. The engine should start.
8. Lock the doors from the outside by touching the button on the door handle.
9. Unlock the doors by touching the handle. (repeat 8 & 9 several times)
10. Lock the doors by touching the button on the handle.
11. Open the trunk. It opens ~~~.

The trunk didn't open at the first time after reset but it did after locking/unlocking the doors several times. :)

The only time I have this issue is when my phone is in the same pocket as my key. In that case, I have to be nearly standing against the car to get the key to recognize, or take my phone out of the pocket.

I have tried to turn on the engine with fob and it did not help.

I finally took the car to the dealer yesterday and they fixed it. They said it needs a software upgrade but could not explain why it worked for years.

Quote:

Originally Posted by cheerful (Post 7688119)

Software upgrade is BS. They should show you the software version # before upgrading it, and after!