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| roughneck Expert Date registered: Apr 2006 Location: UK, Germany & USA Vehicle(s): 270 cdi.300 GD 300 GE.lwb 300 GE.swb. Disco 2 Posts: 4398  | RE: How-to instructions for modifying the diff locker switch box Understood. cap duly doffed.  | |
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| AlanMcR Expert Date registered: Apr 2006 Location: US, CA, Los Altos Vehicle(s): G300DT E300DT 230SL Posts: 3500 | READ THIS: How-to instructions for modifying the diff locker switch box Warning: There is more than one version of the locker controller. Erik's 2000 had a completely different PCB layout. Mine appears to be the same layout but an older production run (different component manufacturers, same function). The modifications for this board are as shown below. Sorry about the quality, these were just notes to myself. The other gotcha is that instead of a ribbon cable between the boards there are hard pins. 20 of them. It takes some skill to separate the halves without damage.
Edited by AlanMcR 6/25/2008 2:50 PM (DiffLockBoard.jpg) Attachments ----------------  DiffLockBoard.jpg (167KB - 2 downloads) | |
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| GwagenLover Extreme Veteran Date registered: Apr 2006 Location: Winston Salem, NC USA 27104 Vehicle(s): 2016 G550 & 2016 GLE350 Posts: 473  | ||
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| AlanMcR Expert Date registered: Apr 2006 Location: US, CA, Los Altos Vehicle(s): G300DT E300DT 230SL Posts: 3500 | ||
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| GwagenLover Extreme Veteran Date registered: Apr 2006 Location: Winston Salem, NC USA 27104 Vehicle(s): 2016 G550 & 2016 GLE350 Posts: 473 | RE: How-to instructions for modifying the diff locker switch box Having been a industrial electronic technician in the 60's, 70's and 80's, the old saying "use it or loose it" has shown to be true, and I have lost the ability and equipment to program Eproms and also the background for chip selection. I am very curious as to where you guys got the diagram for this board and the knowledge of its circuitry. It would take days for an old ET to trace this circuit and research the chips to make any sense of the jumpers you have added unless one was active in the Electronic world. I must a$$ume you are very knowledgable in this field I would very much like to see a scematic drawing of this mod so as to better understand it. As simple as the mod is, I would not want to blow up my board as it probably is big $$$$$'s I would however luke to have the capabilities to select my 2002 lockers as I choose, but I need to be convinced that this is actually working. HUmor and old ET and give up the drawing.....  | |
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| AlanMcR Expert Date registered: Apr 2006 Location: US, CA, Los Altos Vehicle(s): G300DT E300DT 230SL Posts: 3500 | RE: How-to instructions for modifying the diff locker switch box GwagenLover - 6/25/2008 1:22 PM Having been a industrial electronic technician in the 60's, 70's and 80's, the old saying "use it or loose it" has shown to be true, and I have lost the ability and equipment to program Eproms and also the background for chip selection. I am very curious as to where you guys got the diagram for this board and the knowledge of its circuitry. It would take days for an old ET to trace this circuit and research the chips to make any sense of the jumpers you have added unless one was active in the Electronic world. I must a$$ume you are very knowledgable in this field I would very much like to see a scematic drawing of this mod so as to better understand it. As simple as the mod is, I would not want to blow up my board as it probably is big $$$$$'s I would however luke to have the capabilities to select my 2002 lockers as I choose, but I need to be convinced that this is actually working. HUmor and old ET and give up the drawing..... :biggrin: Heh. As I recall, I was really bored, but needed to put in face time. Then Erik casually mentioned the idea of independent locker engagement. Thus a project was born. After determining that the majority of chips were garden variety logic gates I decided that tracing the circuitry might prove to be fruitful. It is only a two layer board. With a stereo microscope the work got done quickly. I presumed that the flipflops latched the button press into a locker state. All that was needed was to find the gate that required both a button press AND an activated locker. Once these were found then all that remained was to fake the status of the locker. There is probably a more elegant solution, but I got tired of tracing circuits. Edited by AlanMcR 6/25/2008 8:08 PM Attachments ---------------- DiffLockCircuitDiagram.pdf (157KB - 40 downloads) | |
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| W5YK Extreme Veteran Date registered: May 2006 Location: San Diego Vehicle(s): 2002 G500, Unimog U2450, Posts: 543  | ||
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| Jonathan Joseph Expert Date registered: Oct 2006 Location: Charleston, South Carolina Vehicle(s): 2004 G55 Posts: 1538  | ||
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| W5YK Extreme Veteran Date registered: May 2006 Location: San Diego Vehicle(s): 2002 G500, Unimog U2450, Posts: 543 | ||
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| AlanMcR Expert Date registered: Apr 2006 Location: US, CA, Los Altos Vehicle(s): G300DT E300DT 230SL Posts: 3500 | ||
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| GwagenLover Extreme Veteran Date registered: Apr 2006 Location: Winston Salem, NC USA 27104 Vehicle(s): 2016 G550 & 2016 GLE350 Posts: 473 | RE: How-to instructions for modifying the diff locker switch box Geesh!  Looking at the drawing, I have just realized how much I have forgotten over the past 20 years. My brain power was in high gear at that time.:bleh: It did jog my memory as I had to decide if it was and gate, nor gate or nand gate logic. Then I got to thinking about all of the old stuff I learned in my earlier years. Good work and my hat is off to all you really bright folks........of course you had to learn it from someone who came up with it from the beginning. You may look back in about 20 years when a smart young genius jogs your old thoughts too. Thank you for the memories....  and for the circuit changes. I am going to sit back an recall those days for a moment. | |
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| ONE Veteran Date registered: Sep 2007 Location: SW Vehicle(s): G-less at the moment...ford Posts: 105  | ||
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| fernweh Date registered: Apr 2006 Location: Calabasas, CA - Centenario, BCS - Luebeck, Germany Vehicle(s): Few Mercedes-Benz, a Toyota Amphibious and a Vespa | RE: How-to instructions for modifying the diff locker switch box W5YK - 6/23/2008 8:47 AM You could also install an ABS disable switch on pin 8 (I need to check you can just pull that low without blowing up the output when its high). That way you could avoid having to engage the center diff on loose gravel roads just to turn off the ABS, which is what I've been doing. Someone who is even more obsessive-compulsive than I am might like to look into the unused rocker switches to either side of the red hazard light warning switch. It would be cool to use those for ESP and ABS disable. Better than Radio Shack toggle switches shoved through a hole. On the G500, they are mechanically disabled, but on other models of Merc, eg C-class, they are mechanically enabled. So it must be possible to buy the little plastic bits to make those switches work. You'd probably only have to spend three weeks on the phone to Germany to sort all that out. Please post it here afterwards! Richard, did you ever figure out, if it is save to ground pin 8 in order to disable the ABS system? I finally took that rocker switch apart..........and "freed" the unused switch - very simple, just have to cut off that little tab  Now the only thing is to find a tiny micro switch, I would like it to be a momentary one, to control a small relay to turn the ESP or ABS system off. Use a loop/latch circuitry for the relay coil so when the ignition is cycled on again the systems (ESP or ABS) are back active automatically. (IMG_2251.jpg) (IMG_2253.jpg) (IMG_2254.jpg) (IMG_2255.jpg) Attachments ---------------- IMG_2251.jpg (63KB - 0 downloads) IMG_2253.jpg (50KB - 0 downloads) IMG_2254.jpg (41KB - 0 downloads) IMG_2255.jpg (47KB - 0 downloads) | |
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| fernweh Date registered: Apr 2006 Location: Calabasas, CA - Centenario, BCS - Luebeck, Germany Vehicle(s): Few Mercedes-Benz, a Toyota Amphibious and a Vespa | RE: How-to instructions for modifying the diff locker switch box jllorepe - 7/8/2009 11:03 PM I have already made the switch: http://www.youtube.com/watch?v=pv2n39t3DN0 Thanks I have made two switches, but no video........done http://www.pointedthree.com/disc/forums/showthread.php?tid=14929&po... | |
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| fernweh Date registered: Apr 2006 Location: Calabasas, CA - Centenario, BCS - Luebeck, Germany Vehicle(s): Few Mercedes-Benz, a Toyota Amphibious and a Vespa | ||
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| AlanMcR Expert Date registered: Apr 2006 Location: US, CA, Los Altos Vehicle(s): G300DT E300DT 230SL Posts: 3500 | ||
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| fernweh Date registered: Apr 2006 Location: Calabasas, CA - Centenario, BCS - Luebeck, Germany Vehicle(s): Few Mercedes-Benz, a Toyota Amphibious and a Vespa | Re: How-to instructions for modifying the diff locker switch box AlanMcR - 5/19/2011 4:40 PM On the note of modding the switches... Does anyone have one of the original 463 switch boxes? The ones with mechanical switches? I'll buy! Alan, aren't the original W463 fitted with three separate switches? Can't remember for sure...... (IMG_1942 (Medium).JPG) Attachments ---------------- IMG_1942 (Medium).JPG (113KB - 0 downloads) | |
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| AlanMcR Expert Date registered: Apr 2006 Location: US, CA, Los Altos Vehicle(s): G300DT E300DT 230SL Posts: 3500 | ||
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