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  #1  
Old 10-21-2012, 03:32 PM
Jeremy5848's Avatar
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Late-124 Keyless Entry

Keyless entry ("KE") to my 1995 E300 is finally complete. This is not so much a "DIY" as it is a "here's what I did." I can provide more details if anyone wants them. Specifically designed for model year 1990-95 W124s (those with the "convenience relay" under the rear seat), pieces of this thing can be used on any 124 and probably other M-Bs as well. YMMV as usual.

This is a complete system -- it may do more than you want. Features:

• All key-operated functions are duplicated with the remote. Key and remote can be used interchangeably. The "KE" electronics occasionally gets lost if you mix/match but re-sync is easy by pressing the opposite button.

• Central Locking is also available from a console-mounted switch, which duplicates the function of the door buttons. (This console switch, like the door buttons, does not arm the alarm.)

• "Convenience" closing of all windows and sunroof is available with the KE remote; its use is the same as it is with a key. This is a complicated system with a long list of what it will or won't do and I still haven't figured it all out.

• A security switch disconnects the driver's door from Central Locking. This allows the driver to lock or unlock his door with the key or with the door button without locking or unlocking any of the other doors. Complete locking/unlocking is still available with the console switch or with the remote.

Wiring diagram:





Electronic bits, under the rear seat next to the Central Locking pump. When this picture was taken I hadn't run the wires under the carpet to the switches in the console. This under-seat location makes it easy to connect to the "Convenience Unit," on the other side of the seat, and through it to the alarm.





KE remote and the added console switches. The Central Locking switch is a window switch with the up/down arrows blacked out -- alas, the factory switch doesn't have the right pin-outs for my circuit. My car's console has the optional "limo wood" panel (124 683 38 37) with all of the switch holes punched.





Details? Just ask!

Jeremy

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #2  
Old 10-21-2012, 06:40 PM
auspumpen's Avatar
Weit aus dem nirgends
 
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Where's the love people? This is an awesome upgrade!
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  #3  
Old 10-21-2012, 08:04 PM
Jeremy5848's Avatar
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Bless you, my child.
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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #4  
Old 10-21-2012, 08:06 PM
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Jeremy
When you say late 124 what years are you refering to? Sounds like a neat project if it will work in my cars. Don
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97 E300D 157000 miles
87 300TD ?141k? miles
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  #5  
Old 10-21-2012, 08:18 PM
Jeremy5848's Avatar
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Quote:
Originally Posted by oldiesel View Post
Jeremy
When you say late 124 what years are you refering to? Sounds like a neat project if it will work in my cars. Don
First paragraph, 4th sentence: "Specifically designed for model year 1990-95 W124s . . ."
__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #6  
Old 10-21-2012, 09:18 PM
oldiesel's Avatar
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Thanks Jeremy i dont know how i missed that must be getting tired. Don
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97 E300D 157000 miles
87 300TD ?141k? miles
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  #7  
Old 10-22-2012, 09:32 AM
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Location: TX
Posts: 3,978
This is great, I need to sort out the auto close feature on my car, I think I may need your assistance in it.

Car has an aftermarket alarm stuffed into the dash knee panel, which has two relays and works the central lock pump, It only works when the key is at point 0. This does not "arm the alarm" . The door lock button also works the pump like it should. If I lock the trunk lid the alarm does arm itself like it should.

The auto roll up feature does not work though, which i believe has to do with the arm feature or the remote system buggering it up.
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1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)
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  #8  
Old 10-22-2012, 10:22 AM
JamesDean's Avatar
Electrical Engineer
 
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Location: NE Ohio
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Excellent work. This is on my to-do list for the 300D. I like the integration with the convenience relay.
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(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #9  
Old 10-22-2012, 12:15 PM
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Options . . .

Quote:
Originally Posted by Zulfiqar View Post
This is great, I need to sort out the auto close feature on my car, I think I may need your assistance in it.

Car has an aftermarket alarm stuffed into the dash knee panel, which has two relays and works the central lock pump, It only works when the key is at point 0. This does not "arm the alarm" . The door lock button also works the pump like it should. If I lock the trunk lid the alarm does arm itself like it should.

The auto roll up feature does not work though, which i believe has to do with the arm feature or the remote system buggering it up.
Since you have the identical car I may be able to help. The window-close feature is triggered (in an unmodified car) by the switches in the door; as these are also the switches that arm the alarm, it's possible that the installer of your aftermarket alarm cut some of the wires and connected them to his alarm.

You have to decide whether you are willing to live with the consequences of the aftermarket alarm or bite the bullet and attempt to return the wiring to a stock configuration. It's always risky making assumptions about where the wires go based on a schematic wiring diagram; too often the artists are more concerned about making the wires look pretty on paper than accurately describing what's actually in the car. With that caveat, the wires from the driver's door could run first to the alarm and then to the convenience relay or vice-versa. Either way, those wires are interconnected. Without them, the auto-close feature will not work from the driver's door.

This brings up an option: use the wiring from the passenger door and abandon the mess in the knee panel. Question for you: does auto-close work from the passenger door lock? It should, it does on my car. If it does, you have unboogered wire to work with; if not, there is a larger problem. NOTE: auto-close does not work from the trunk. I just went and confirmed that.

Jeremy
__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #10  
Old 10-22-2012, 12:57 PM
JamesDean's Avatar
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Location: NE Ohio
Posts: 5,038
Here is a question, how does the auto-close/auto-open know when the windows is fully up/down? Is there some kind of limit switch? Current sensing?
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #11  
Old 10-22-2012, 01:13 PM
Jeremy5848's Avatar
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Answer

Quote:
Originally Posted by JamesDean View Post
Here is a question, how does the auto-close/auto-open know when the windows is fully up/down? Is there some kind of limit switch? Current sensing?
An excellent question. The "auto-close" term is really a misnomer. It is really "auto close as long as you keep the key turned (remote button pressed)." Thus, YOU are the limit switch. The convenience relay does not know when the window (sunroof) is closed.

This brings up a question I had not considered: how does the convenience relay know when the window is fully open when you press a front window switch all the way to "auto down?" I'll have to look at the diagrams because I don't know how that works.

Thanks for asking!

Jeremy
__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #12  
Old 10-22-2012, 01:18 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,038
Quote:
Originally Posted by Jeremy5848 View Post
An excellent question. The "auto-close" term is really a misnomer. It is really "auto close as long as you keep the key turned (remote button pressed)." Thus, YOU are the limit switch. The convenience relay does not know when the window (sunroof) is closed.

This brings up a question I had not considered: how does the convenience relay know when the window is fully open when you press a front window switch all the way to "auto down?" I'll have to look at the diagrams because I don't know how that works.

Thanks for asking!

Jeremy
Interesting. I've often wanted to incorporate this feature set into one of my 126/124s cars but not knowing when to stop makes it difficult. I mean, you could use limit switches for auto up/down... That would be annoying, installing/mounting/wiring 8 switches in the doors. Current sense/limit would work better/easier. Current draw should increase when the window hits the top/bottom, soon as that current spikes up cut power.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #13  
Old 10-22-2012, 01:30 PM
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Location: San Diego
Posts: 3,537
It works on the same concept as auto antenna. The electronic cuts off on current spike when the window reaches the limit of travel.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
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  #14  
Old 10-22-2012, 06:01 PM
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Stop!

Quote:
Originally Posted by ah-kay View Post
It works on the same concept as auto antenna. The electronic cuts off on current spike when the window reaches the limit of travel.
Good, thank you. I wondered how that worked. The circuitry must be part of the "convenience module." Certainly the regular power window hardware doesn't have anything like that, at least not in any Benz I've ever owned.

Jeremy
__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #15  
Old 10-23-2012, 11:45 PM
scottmcphee's Avatar
1987 w124 300D
 
Join Date: Mar 2008
Location: Edmonton, Canada
Posts: 1,539
You could insert a DEI530T module in-line with the window motor. Acutally one module accommodates two windows. You'd get a pair of DEI530T's to cover the whole car.

This module provides end-of-travel / obstruction cut-out, but it's primary purpose is to provide "one touch" up/down window operation from the interior window switch.

You'll also find it has logic inputs that, when grounded, can make the attached windows go up or down.

It's easy to attach this to a timed remote button press, joined with lock or unlock.

And if you want to program special features using a microcontroller, you'd end up with something like the products on autowindow.com

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1987 300D
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