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Old 10-16-2009, 06:38 PM   #1
Soviet1942
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Lightbulb Central Locking "red/black wire" modification

Updated quick write-up

Red/Black wire is a feed wire that is permanently live which feeds power to the Central Locking System

It arrives at the 'A' post, takes a trip into the driver's door to a socket to feed power for the rarely fitted heated door lock, then travels back out of the door via the 'A' post. It passes into the door through the multi-plug visible when the door is open.

This plug has a habit of collecting water, as it is live all the time. It tends to corrode it's pins within the socket. Before this (Red/Black) wire takes it's almost useless trip in and out of the driver's door, it feeds the central locking relay that is cunningly hidden under the speaker in the driver's footwell. So corrosion in the 'A' post socket upsets the Central Locking System.

The (Red/Black) wire should be cut short of it's entry/exit into the drivers door and then be joined straight to the relay so that the loop through the driver's door is eliminated.

The two ends of this wire on the 'car' side of the 'A' post should therefore be soldered together,and suitable insulation applied to the join.


My version (same thing just worded differently):

I'll see if I can get pics to further help. Its quite simple when you get the general idea. Just look for a wire that is Red/Black that goes into the door plug and cut it short before it enters the plug. Remove the two screws under the speaker. Remove the speaker and there should be a cover on the bottom, take the cover off. You should now see the central lock relay and control unit. The relay has two Red/Black wires that come out from it, one leads to the door plug and one goes straight to the control unit. Cut the wire on the relay that DOES NOT lead straight to the control unit (give the most slack you can). Now join that wire to the Red/Black that you first cut and put everything back together.



I honestly don't think it can be explained any easier.




Original thread question.

Quote:
Anyone heard of this or done it? Any information would be great

taken from e30zone.co.uk

Quote:
Red/black wire is a feed wire that is perminently live.
It arrives at the o/s 'A' post,takes a trip into the driver's door to a socket to feed power for the rarely fitted heated door lock,then travels back out of the door via the 'A' post.It passes into the door through the multi plug visible when the door is open.t
This plug has a habit of collecting water,as the red/black is live all the time it tends to corrode it's pins within the socket.Red/black,before it takes it's almost useless trip in and out of the driver's door feeds the central locking relay that is cunningly hidden under the r/h speaker in the driver's footwell.So corroision in the 'A'post socket upsets the central locking system.
Mr Moore advises that the wire should be cut short of it's entry/exit into the drivers door and the loop through the driver's door eliminated.The two ends of this wire on the 'car' side of the 'A' post should therefore be soldered together,and suitable insulation applied to the join.
Note I refer to 'driver's' door,this depends on which side of the car the driver sits...this mod means r/h on a RHD car and l/h on a LHD car....
The 'C' clip holds the lock barrel on from behind,it's one of those silly things that once you have done it,it is obvious and very simple.Always remember that these cars were assembled on a moving production line by semi-skilled workers,so there is nothing too difficult..
With the doorcard removed,shine a light into the area where the lock barrel is,you will be able to see it.Poke a long,flat bladed screwdriver through the round hole opposite the barrel and engage the blade with the 'C' clip at the forward edge of the barrel,then flick the 'C' clip forward,it's big(about 2'' square)so there is no risk of loosing it,it will drop into the bottom of the door.The lock barrel will then wiggle out from the outside.
The barrel retains a mounting plate that holds a micro switch,this micro switch,in effect,transfers the manual movement of the key in the lock barrel into an electrical signal to tell the rest of the doors to lock/unlock,it's general state of wear/cleanliness etc is vital to getting the system to work properly.
Work on the locks with the window closed,it will give you more room...
From this I don't understand:

Quote:
"The two ends of this wire on the 'car' side of the 'A' post should therefore be soldered together,and suitable insulation applied to the join."
So would I just splice the yellow highlighted wire and loop it back into itself?


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Last edited by Soviet1942 : 11-02-2009 at 01:43 AM.
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Old 10-16-2009, 07:16 PM   #2
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i'm so confused, what is this supposed to accomplish in the end?
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Old 10-16-2009, 07:42 PM   #3
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Honestly, I don't know much about it but from what I've been reading it might fix my central locking system.

"This plug has a habit of collecting water,as the red/black is live all the time it tends to corrode it's pins within the socket.Red/black,before it takes it's almost useless trip in and out of the driver's door feeds the central locking relay that is cunningly hidden under the r/h speaker in the driver's footwell.So corroision in the 'A'post socket upsets the central locking system."
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Old 10-16-2009, 11:39 PM   #4
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Do all of your actuators work?
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Old 10-17-2009, 11:36 AM   #5
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Did you check for corrosion first at that plug? I'm fairly certain the central locking worked back in 1987 the way the car was wired.....
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Old 10-17-2009, 03:06 PM   #6
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Great news, that shit fucking works!
Rerouted the blk/rd wire and tired locking my doors and it worked flawlessly. Now I can install my keyless entry system. Going to take pictures to make a quick write up
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Old 10-18-2009, 07:18 PM   #7
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Whenever the central locking system shits the bed, the connector on the A-pillar is my 1st suspect.
So this wire feeds the lock heater only? I have that fitted in my M3. I have also heard very rare reports of the heating element failing and damaging the vehicle.
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Old 10-30-2009, 09:45 PM   #8
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hey Soviet1942
I think there are a good amount of E30 owners that would really appreciate a good little right up on what you did. Including my-self.
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Old 10-30-2009, 11:01 PM   #9
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Ohh yeah, let me get started on that.
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Old 10-31-2009, 09:58 PM   #10
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Quote:
Originally Posted by redlyne22 View Post
hey Soviet1942
I think there are a good amount of E30 owners that would really appreciate a good little right up on what you did. Including my-self.
+1 can you try to explain it better atleast? pics would be a plus. As my central locks dont work at all not even from the trunk.
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