300ce seat backs not locking upright

ninaandphil

New Member
Joined
Aug 1, 2011
Messages
27
Car
Mercedes 300CE 24V
Hi all,
Just fitted replacement black leather electric seats into my 300ce. Had fun fitting a wiring harness into the passenger side, through the door etc, which wasn't electric before, but happy to say all electrics working fine.... BUT!!! Neither of the seat backs are locking into position, and this isn't affected by having the doors closed, engine running etc...
There is a vacuum pipe under each seat, which I haven't connected up yet...(missing connector)...
does anyone know if this pipe is related to a locking mechanism, or what they are for. The buttons to release the seat backs and tilt them forward have no 'feel' to them, and don't have any resistence when pushed in.
Any advice greatly appreciated.
Phil..:dk:
 

bh13coupe

Active Member
Joined
Jul 2, 2008
Messages
830
Location
poole dorset
Car
124 coupe
I think it needs the vacuum connected for the locking to work.

yep, my coupe failed its only MOT in 7 years on that issue, I had a vacuum leak which wasnt locking the seatback when the engine was running. wasnt expensive to fix, more of a hassle tracking down the leak. do u get any wihning/hissing noise in the cabin when the car starts up?
 

219

MB Club Veteran
Joined
Aug 19, 2002
Messages
15,664
Location
Gone
Car
Not always
You need the vacuum connection for the locks to work .
 
OP
OP
N

ninaandphil

New Member
Joined
Aug 1, 2011
Messages
27
Car
Mercedes 300CE 24V
Hi all, thanks for confirming my suspicions... I need to find a couple of 'sleeves' to join the car and the seat vacuum pipes together... hopefully that will work... by the way, the car is a manual.
Cheers!
 

babyblueCE

Active Member
Joined
Aug 13, 2011
Messages
212
Car
300 CE
From my understaing the vacuum is what keeps the seats locked upright. That needs to be connected for the seats to lock, it is also a MOT failure if the seats don't lock.
 

Dieselman

Banned
Joined
Jul 13, 2003
Messages
34,206
Car
Peugeot 403 Convertible
Hi all, thanks for confirming my suspicions... I need to find a couple of 'sleeves' to join the car and the seat vacuum pipes together... hopefully that will work... by the way, the car is a manual.
Cheers!

Clear plastic tubing as sold in B&Q works well.
 

carat 3.6

MB Enthusiast
Joined
May 11, 2011
Messages
4,007
Location
In the workshop
Car
S124 E300d wagon, W124 om606 monster, E46 v8 coupe
The seats only lock in position when under vacuum.
 

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