Mercedes left rear door lock issue

[Sophia]

Dear everybody,

My Mercedes c180k estate's rear door can not be locked or unlocked by either the key or the console, but if i manually push down the button then close the door, it can be locked. It is not bouncing up and down, but no reaction with key, auto, or central console except a noise. It seems like it is trying...all other three doors work well.

Details:

1. When trying to lock/unlock the left rear door with key or console or auto lock when driving, it won't lock/unlock, but come with a noise sound.

2. At beginning, it cannot be unlocked, I cannot open it by anyway, but after a few days, after a noise, it can be locked/unlocked manually

3. Now I can lock the door by pushing down the button, and open it from inside handle

Anyone who can help, Thanks

 

[television]

Hard to know, the rod could be too tight in the grommet where it passes through the door skin.

 

[Sophia]

Hard to know, the rod could be too tight in the grommet where it passes through the door skin.

Thanks television,
i found a pic of Mercedes rear door, and the noise is coming from the part where the yellow arrow pointed. is that where the rod you mentioned located? Thanks

 

[Xtractorfan]

You do need someone to look at it, not sure if the solenoid is an integral part of the lock, these do play up from time to time.

 

[television]

It is actually a motor.

 

[Xtractorfan]

Is it part of the lock or separate?

 

[phils]

See previous post which may have some useful info? (my reply is post#9)

http://forums.mercedesclub.org.uk/showthread.php?t=149176

Phil