[W126 Coupe] central locking question

[Markus Meyer]

 Okay, easy, eh?!!!  Guess I need Electrics 101 here.  I opened up the trunk and removed the cover for the pump and took it out.  Disconnected the 3-prong connector, and left the other connector attached (2 prong, whatever that is), and vacuum line obviously.  Now when you said connect to ground I thought you meant pick a ground point, so there happened to be a big huge bolt right behind where the pump sits, so I touched one end of the wire to that, the other end to any of the 3 prongs (doors and trunk open) and nothing.  Am I doing something wrong, is that not the way to touch to ground, and if not, please enlighten me, as I'm feeling pretty dopey right about now. Cheers,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 20:13:46 +0000Subject: RE: [W126 Coupe] central locking questionMarkus,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" >Reply-To: mfmeyer at iwon.com,Mercedes Coupes Mailing Lists >>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.>>_______________________________________________>>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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