Trunk won't open
 

Hello, my 2009 E-Class is having a problem with trunk not opening.
Red light on door trunk switch is on, trunk closes with red button on trunk lid itself.
I noticed that the interior dome lights in truck are FLASHING. So trunk does not repond
either with door switch (although red, seems to have power) or with remote key knob.
Only opens with small key. I already checked the BROWN ground wire, it seems to be fine.
I noticed that when I connect and disconnect the brown ground wire, the trunk dome begin flashing
on off for about 30 seconds. Can anyone offer assistance please?