Update....I cut black and red power wires and removed everything from car defeated. Put seat and all back together. Decided to try power from my electric drill battery in the house and the thing works! So I must have had a power wire come loose inside my orginal connection to the pump's power plug. So, when I retry, what do I connect the top three wires and bottom three wires to on the round plug's 2 yellow, one green, and one blue wire bundle to get this thing to work? I don't under stand the +12 and -12 Volt wire situation...sorry.

Thanks so much!

Steve

I am about to install same unit in my car ('89 420SEL) and like to confirm following schematic.
Attachment 85032

Please let me know if i understood correctly or not. If some connection don't need please correct me so i don't cut wires unnecessarily.

You understand this way better than me! If it works, will you post exactly what you did? I can kind of get the schematic but after I fiddled with it last night, my pump isn't working today. I spliced power from the module into the red and brown wire from the pump and it clicked on and off with the remote fine but I think the splicing chocks I used messed up the connection. After that, I was not sure what to cut and or splice, etc. Can you please make this easy for a non schematic reader? It looks like you know what you are doing. I have the exact same color wires in mine.

Thanks,

Steve

Whew! Good news. I rechecked fuses and replaced Fuse C3 which put everything back to working order. I also had rewired back to orginal status before I checked and now it is working fine again. However, I'm still hoping for an update on where to connect those other wires to after the initial power up connection for the China keyless Entry module unit.

Utruelove78....any luck or progress with your install based on your schematic? I know I can do it but don't want to screw anything up again.

Steve

OK...I give up. I tried every possible configuration of the diagram shown in this thread and all my unit would do was click on and off and flash the blue light. The vacuum pump still works. The door locks work fine even with the thing installed. I took it all out though and left my nasty butt connector mess to hold it all together. If anyone figures out what I'm doing wrong, please post....

This all makes complete sense. You actually added details that are probably going to help folks out. On my schematic, I assume that folks will know how to connect +12V and ground, etc - but your notes makes this more clear, so thanks!

Besides the module wiring that I point out, the other two wires that need to be connected are the power (red) and ground (black) - this is what provides the power to the keyless module. Again, seemed obvious to me, but in hindsight is a neglectful omission.

Let me know how things work out.

Sorry this is not working out. Sounds like you have power to the module (red and black wires), so that is good. The six wires in the schematic are needed for the controls. One goes to 12V, one goes to ground, one goes to the air pump via the spliced wire (you can use any of the colors, I used green), one goes to the door via the spliced wire (again, green in my example), and two of the wires get tied together (that is the easiest connection).

I am a little perplexed that you have two yellow wires. Mine and the other ones I have been reading about had two green wires. I guess you could try splicing into the blue wire...it really shoudn't matter which one you do.

Keep me posted.

Gave up and had my friend install a Viper Keyless Entry. Cost me $100.00 but works like a charm and all lights work along with the horn sound to activate and sound like an alarm setting. Plus, I can get new remotes if I lose or damage the ones I have. He installed everything under the dash and didn't even mess with the pump module.

Thanks for confirmation. I was thinking of tinkering with it today but decided to wait until someone confirms and gave it good wash instead :). I also looked at Aussie max system which he says plug and play and liked the idea of using trunk light power and antenna ground that way i won't cut pump electrical wires, only the ones that operates the doors and trunk(yellow).
I will keep you guys posted with results and if successful will write up DIY with pics so it can help folks who are not very comfortable troubleshooting electrical things like me.

Confirmed. For those who want to install this please use attached picture with my comments. I used existing diagram from treiberg and put comments if anybody get confused. I also installed at pump itself near spare tire. In addition to this I connected 2 brown wires(direction light in doc) to Parking light at pin 6 (gray/black) cable. I have to use both as I have w126 but in w124 you can wire only to one parking light and it will flash both. Working fine with factory alarm system as Lock/Unlock both from key/keyless system arms and disarms factory system. I confirmed this with leaving window open and while locked using key/keyless opened the door and alarm went off.
Thanks again to treiberg for providing diagram. It helped a lot.

I bought the $25 kit, and will install it in my 92 300D.
Anybody have pictures from the install?
Thanks-

issues with my USkeyless kit
 

so i installed the kit from USKeyless that i bought on ebay, and i used the crappy instructions that came with it along with the superior instructions on the wiki to get it installed. It works in the sense that the locks go up and down, so that is great, but i have not hooked up the 2 brown wires to the lights. i installed it by the vacuum pump, so i would have to run wires to the Front and Back lights?? or do i just have to run the 2 cables to 1 set of the lights. anyway, i am not really worried about the lights flashing or the horn beeping. just want the doors to unlock.

2nd question. i followed the wiki in attaching the 2 wires to the Alarm disable and enable, but seem to have attached to the wrong wires. when i unlock using the remote the alarm goes off, meaning it was not disabled.

the instructions that came along with the kit told me precisely what cables to attach it to, but there were multiple of that color connected to the same plug. anyone know how i could troubleshoot the alarm system?

I will get some pictures tomorrow once i have time to remove the rear seat again.

bump

Well you don't have to go front lights. Just both tail lights.

I am attaching 2 pictures for reference.

Attachment 86874

This is passenger side tail light closest to pump. Run one brown cable there and solder it with yellow/green wire as seen in pic. I just attach it under banana plug and didn't solder it.

Attachment 86875

This is driver side tail light, run second brown cable there and attach it to black/white cable. Brown cable will be little short to reach there so i cut existing no use cable from harness, attached it to brown to extend it.

Both your front and back lights will flash when you lock or unlock car.
When you lock it once, if already locked three times and when you unlock it 2 times.

Hope this helps.

What a great solution to my stuck driver's side door tumbler.
 

Wow. Just what i needed when i needed it. I was frustrated all day having to go around to passenger side to unlock my car. The drivers side door tumbler is jammed and the trunk is getting close. This will be awesowe. Thanks.