[W126 Coupe] central locking question

[Markus Meyer]

 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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