[W126 Coupe] central locking question

[Sharan Bains]

Just 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" <sharanbains at hotmail.com>
>Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
>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" <mfmeyer at iwon.com>
>>Reply-To: mfmeyer at iwon.com,Mercedes Coupes Mailing Lists 
>><mbcoupes at mbcoupes.com>
>>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
>>
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>>
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>
>The MB Coupes Website!
>W126 SEC Mailing List
>Postings remain property of MB Coupes, L.L.C.