SL350 central locking problem

[STEc74]

This problem started last night after a run in the car,on ariving home i tried to lock the car with the fob but would not lock althoughindicators flashed as normal,tried the emergency key,this to would not lock the car but alarm activated when opened the door,further to this i can`t gain access to the boot with either switch on drivers door or key fob,the emergency key wont turn in boot lock, maybe stiff .
any advice welcome.

 

[drmw]

99% certain this is the PSE pump in the boot

There is a fuse behind the driver's seat in the storage box under the false floor - it's the only 20amp (yellow) - check that first

If it's gone, then a possibility of water ingress in the boot, but best one step at a time to find the cause

 

[Dec]

What year is the car?

Dec



Edit
Typical vacuum pump, see post#46 here… http://forums.mercedesclub.org.uk/showthread.php?p=525297

Dec

 

[drmw]

re getting in with the key - I've always used the one from the remote itself.

It should turn in either door, so if not, then as the previous post, you need to spend some time with (initially) WD40, wiggling the key about - it will eventually turn. After if does, shoot some silicone lube as WD is not the best to leave on its own.

The boot is more of the same until the key turns. Once it does, you need both hands to get in.

Looking down on the boot lid from above, turn the key in a clockwise direction and hold it there, with the other hand, pull the boot release handle & it should open. You cannot isolate the boot lock - if the PSE is down, it's key every time.

 

[STEc74]

Hi deck car is 2005, in the winter months the boot seems to get a lot of condensation causing metal work to be dripping wet, has stopped raining now so will have a go at openning boot,cheers will keep you posted....Steve

 

[drmw]

once you have got it sorted / replaced, see post 45 in this to protect the pump http://forums.mercedesclub.org.uk/showthread.php?t=87222&highlight=bubblewrap&page=5

 

[STEc74]

have tried freeing lock with WD working key left to right, have got some movement anticlockwise but still very stiff will not turn clockwise,does key open either way,i`m frightened of breaking the lock.

 

[drmw]

the bootlock only works one way - pretty sure the doors the same.

You have to persevere - it should operate. eventually, but if it's the boot you're trying, the key on its own will not unlock or open the boot - it needs the handle pulled at the same time (turn key & hold, then pull handle) and the key (from memory) doesn't even go 90 degrees max

Did you check the fuse yet? If it's blown, it's not a good sign, but replacing it might get the system working briefly

 

[STEc74]

Hi, checked 20 amp fuse, has blown,Should i pop in new fuse and what could cause it to blow.

 

[television]

Better still is to stop the water from getting in if the foam box that the pump sits in as the water can run down the cables, have you opened the drivers door yet and checked the 20 amp fuse that David talked about

 

[television]

If it blows again then the pump has failed, at the very least the pump needs to be removed.

Just undo the the 4 nuts holding down the roof pump and lift to 1 side, then lift the PSE pump in the foam block out and separate the two halves, the pump will unplug and so will the vacuum connectors.

 

[STEc74]

Yes fuse has blown there are two 20 amp fuses the one in a blue fuse holderto the right is ok.

 

[drmw]

Yes fuse has blown there are two 20 amp fuses the one in a blue fuse holderto the right is ok.

it's the one slightly left of centre

 

[television]

I only have the 2002 500 diagram and only 1 20 amp fuse number 171, 4th from the right

 

[drmw]

I only have the 2002 500 diagram and only 1 20 amp fuse number 171, 4th from the right

I thought that too - even said so in an earlier reply on this thread - assumed I'd missed one!!

 

[television]

I am sure there are no changes David, if any after 06-06 I forget if there are any spares in that box, or are they all up front

 

[STEc74]

seems like the wright fuse fourth one in just off centre

 

[television]

seems like the wright fuse fourth one in just off centre

Yes that is correct,,,, is it still blowing

 

[drmw]

as you will be trying another fuse & it may work for a while, make sure you leave the storage box lid open - it locks as well as the doors etc which means a bit of messing about to get to the fuse if/when it blows and the car is then locked!

 

[STEc74]

could`nt find spare fuse so called to shop,fitted fuse every thing working opened boot with fob, will check out pump will it need drying or cleaning