Wanted to put a reference over here for those folks that may not make it over to the diesel forum where this was originally posted:

http://www.peachparts.com/shopforum/diesel-discussion/283569-diy-keyless-entry-door-lock-w126-w124.html#post2531985

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Treiberg's Collection: 1981 240D, 1985 300SD, 1992 300E, 1997 E300D, 2005 C230K

I used a 'rec43t' keyless kit from some company called 'omega research' on my W201. It has 4 wires (lock, unlock, power, ground) and 2 remote controls. It cost $25 and works great. I wired it through the trunk lock. W124 and W126 would use the same setup.

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CENSORED due to not family friendly words

Its important to note that on first generation w126's you'll need to install a door lock actuator on the driver side door as there is no vacuum supply. I had to do this on my one 300SD.

The 201 has a Directed Electronics unit, works well, its tucked under the the back seat.

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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

Just be careful an aftermarket unit that didnt have 3 second hold for the locks (usually using bosch relays to accomplish) can burn up the central locking wiring along with the door sensor/trunk lock wires. I have replaced about 20 wires from a unit that looked wired correctly with bosch relays and it still did things tha may never really be ever fixed. And yes all lines had fuses, but it looks like a slow burn if you know what I mean.

Once I removed and re-ran wires and resoldered I have been trouble free for the most part.

tjts1,

I have the REC-43T and I have been trying to figure out how to wire it up to my '91 300CE (W124). I tried to connect it to the trunk lock actuator and I can't get it to work.

I have 3 wires from the vacuum pump (under the back seat) to the trunk - red (12v all the time), yellow (12v when unlocked), and a brown wire (ground). I don't have the blue or the green wire (from the REC-43T) connected anywhere - and I'm sure this is part of my problem. Any suggestions?

ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE