central locking pump - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 02-19-2012, 12:40 PM Thread Starter
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central locking pump

Hi, Can anyone tell me where the central locking vacuum pump is situated on my E270 Estate W211 2004. When I press the key fob to unlock, the door lock mechanisms go haywire, shooting up and down. Some doors open, some don't, never know which ones it's going to be!. Locking no problem. Thanks.
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post #2 of 5 (permalink) Old 02-19-2012, 01:20 PM
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That doesn't sound like a pump (PSE) problem to me. We have different cars but my pump is under the rear seat beside the battery. You might try asking on the W211 forum found in the sedans section.

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post #3 of 5 (permalink) Old 02-19-2012, 03:05 PM
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What makes you think that you have pneumatic driven central locking?

I think that you have an 'all electric' system with electrical actuators on each door. That 'machine-gun' effect on opening or closing a door is generally a faulty sensor switch on the door lock mechanism. The clue to which one is that it happens only when opening. What happens if you leave each door open, one at a time?
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post #4 of 5 (permalink) Old 02-21-2012, 11:54 AM Thread Starter
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Originally Posted by keyhole View Post
What makes you think that you have pneumatic driven central locking?

I think that you have an 'all electric' system with electrical actuators on each door. That 'machine-gun' effect on opening or closing a door is generally a faulty sensor switch on the door lock mechanism. The clue to which one is that it happens only when opening. What happens if you leave each door open, one at a time?
Tried leaving each door open but the result is the same although I have noticed that it is the front doors that are affected rather than the back, what is the sensor and where is it (They) located?
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post #5 of 5 (permalink) Old 02-21-2012, 05:56 PM
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The 'sensors' are switches inside the individual door locks S17/3 to 6 for the four doors. It will need to be a complete unit replacement - unless a squirt of switch cleaner into the mechanism clears the problem. This comes in a pressurized can with a volatile aerosol that leaves no residue.

If that does not work, to remove the door locks you have to take off the door interior lining. Front door lock removal is as shown in the WIS drawing below. Removing the door lining is another task.

It is possible that the fault is not the switch but associated wiring, so I have included the wiring diagram of the door contact switches. Maybe even the chassis earth(s) shown as Z6/47z1 and Z6/46z1 in the door sills.

Could rainwater have penetrated the door sills? If you need drawings for those chassis earth locations I can find those.
Attached Files
File Type: pdf W211 fr door lock.pdf (847.7 KB, 100 views)
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