[W126 Coupe] central locking question
Sharan Bains
sharanbains at hotmail.com
Mon Jun 6 16:13:46 EDT 2005
Markus,
Yes, easy to verify if it is the pump.
Remove the 3 prong connector (which has the blue/yellow/green wires).
Connect a wire to ground at one end and then (with the doors open and keys
in your pocket) touch the wire on one of the 3 terminals on the pump. No
matter which terminal you touch, doors should lock (since a 3 second ground
signal locks doors). Test each of the 3 terminals on the pump
turn-by-turn...if doors lock from all three terminals on the pump, then pump
is fine - then you know it's the alarm unit/connections from it that are the
culprit.
talbir
>From: "Markus Meyer" <mfmeyer at iwon.com>
>Reply-To: mfmeyer at iwon.com,Mercedes Coupes Mailing Lists
><mbcoupes at mbcoupes.com>
>To: mbcoupes at mbcoupes.com
>Subject: RE: [W126 Coupe] central locking question
>Date: Mon, 6 Jun 2005 16:07:23 -0400 (EDT)
>
> Thanks for all the replies so far... I just checked and the driver's door
>only locks/unlocks itself. The trunk locks/unlocks all 3. The pass door
>locks/unlocks all 3. Sitting in the car, all closed and unlocked, when
>clicking remote, I hear the chirp of the alarm, then a clicking/vacuum kind
>of noise in the door, then silence, then another clicking/vacuum in the
>door again, and possibly something going on in the pass footwell but didn't
>sit on that side of the car. So I guess Talbir is pointing me to an
>electrical fault. Later on after my workout and dinner I'll pull the pass
>side apart and see if I find wires being spliced in and all. I'm just
>suspicious that this same thing happened two years ago and swapping the
>vacuum pump cured it until now....seems odd because if it were electrical
>all along, why would that have worked? Of course I don't know that I
>tested all 3 access points back then to know what worked/didn't back then
>and I may truly have had a bad pump back
>then and not now. Thanks,Markus --- On Mon 06/06, Sharan Bains <
>sharanbains at hotmail.com > wrote:From: Sharan Bains [mailto:
>sharanbains at hotmail.com]To: mbcoupes at mbcoupes.comDate: Mon, 06 Jun 2005
>19:55:25 +0000Subject: RE: [W126 Coupe] central locking questionJust a
>further note - if locking works from trunk/pass door, and all doors lock
>when you lock from one of these points, then you don't have a vacuum leak.
>It's an electrical fault you are looking for.talbir>From: "Sharan Bains"
>>Reply-To: Mercedes Coupes Mailing Lists >To:
>mbcoupes at mbcoupes.com>Subject: RE: [W126 Coupe] central locking
>question>Date: Mon, 06 Jun 2005 19:45:28 +0000>>Hi
>Markus,>>Do all doors lock if you lock from the passenger door
>?>>The CL pump has 3 wires coming into it - one from each actuator
>and there >are 3 actuators on the w126 : one each in the front doors and
>one in the >trunk.>>When alarms are fitted they usually splice
>into the blue wire
>running from >driver door to pump (wire from passenger door is green,
>trunk wire is >yellow). One end of the spliced wire (the pump end) is
>connected to the >alarm control unit which sends +12V/gorund to
>lock/unlock doors. The other >end of the wire (drivers door side) also
>runs to the alarm unit, to >complete the circuit...so that if you lock
>the drivers door via the key, >then all doors and trunk/gas flap lock as
>well.>>The fact that your alarm is not working the central locking
>and that your >locking is not activated via the drivers door suggests
>that the circuitry >in the alarm unit that controls the lock mechanism
>is faulty - or the wire >running from alarm unit to CL pump is bad or
>has come loose at the alarm >unit end. The alarm unit contains a circuit
>board with SPDT relays and >timer relays to trigger the 3.5 second
>+12V/ground pulse required to >lock/unlock doors.>>Under the
>drivers side footmat, you should find a
>black plastic covering on >the footwell area running along the door side
>- under that flap, you may >see where the blue lock wire has been
>spliced into. The wire runs from the >driver door to the pump - so
>passes under that area. It is probably that >the solder joint has gone
>bad.>>If you sit inside the car and activate your alarm by remote,
>can you hear >any relays clicking ? If so, your alarm is working and
>sending a signal - >in which case the blue wire has no link to the
>pump.>>>talbir>>>>>>>>From: "Markus Meyer"
>>>Reply-To: mfmeyer at iwon.com,Mercedes Coupes Mailing Lists
>>>>>To: mbcoupes at mbcoupes.com>>Subject: [W126 Coupe]
>central locking question>>Date: Mon, 6 Jun 2005 14:39:01 -0400
>(EDT)>>>> Hi gang, My 1987 560SEC recently started acting up
>where I realized the >>remote for my alarm wasn't locking the
>driver's door. This happened about >>2 years ago and I
>replaced the vacuum pump in the trunk after swapping >>with a known
>good one from a local fellow lister. I'm just curious if I >>have the
>same problem again or something else maybe? Driver's door will >>lock
>with key, but only that door. Everything will lock if I use the key
>>>in the trunk. Nothing will lock if I use the remote for the alarm.
>I'm >>just stumped why the trunk would lock everything but not the
>driver's >>door, and how this could be the pump, wouldn't the pump
>work the door as >>well as the trunk way?
>Thanks,Markus>>>>_______________________________________________>>>>The
>MB Coupes Website!>>W126 SEC Mailing List>>Postings remain
>property of MB Coupes, L.L.C.>>>The MB Coupes Website!>W126 SEC
>Mailing List>Postings remain property of MB Coupes, L.L.C.The MB Coupes
>Website!W126 SEC Mailing ListPostings remain property of MB Coupes, L.L.C.
>
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