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Okay, I saw discussion somewhere here from like a decade ago and I think it died off, I'm getting no replies. This is very long winded, so I apologize but I'm so frustrated that this should be so dang hard!
1995 W124 WAGON with a brand new Audiovox AA25 keyless entry. I also have a good known working keyless entry (from United Auto Security) for my other W124 sedan that works just fine. Note that on this wagon the door locks work perfectly up and down with the key in either the drivers door or passenger door.
Before I start, here is how I hooked it up to my other W124 SEDAN that works just fine. It is just a 3 wire deal. That's it. Blue, Green, Yellow (Driver door, passenger door, trunk). The three colors come in from the loom and right to the round connector at the vacuum pump. I cut the blue wire, put the input and output wires from the keyless on each end of the cut blue wire, and it works in the sedan just fine. Of course you put its 12v to the red wire on the square connector going to the pump, and its black wire to the brown ground wire on the square connector on the pump, etc.
So instead back to the WAGON: I put the 12v power wire from the Audiovox (or United Auto Security) to the red/white wire on the square plug of the vacuum pump like usual I put the black ground wire from the Audiovox (or United Auto Security) to the brown wire on the square plug of the vacuum pump like usual When I hit the remote, the module (both Audiovox and the United Auto Security one when I tried it seperately) clicks just fine, so I know both are getting power.
Well, the Wagon doesn't have just 3 in from the loom going from front of the car to the round connector at the vacuum pump. It has six. Ya. It has 3 blue, 3 green, and 3 yellow. Also, it has a split 't' from that same loom that doesn't have 2 of each color, but just one of each color and it goes to a connector that is white on one end and black on the other. It then does a u-turn and goes into a second loom back towards the front of the car.
If I do the same method on one blue wire going to the vacuum pump round connector, the remote won't do anything. Again, remind you that it does click so its getting power. One thing to note is that when the keyless is tied in between the two cut ends of the blue wire, even though the remote doesn't do anything, the key in the door still will run the pump. If I leave those cut blue wire ends exposed, the key won't even work. So at least I know that the keyless module is completing the loop of the two broken ends of the blue wire.
Neither keyless module (audiovox or United Auto Security) works, yet they both work in my sedan W124.
Can anybody let me know what the hell I'm supposed to do with this wiring? I did try making the 2 blues that come out of the round connector tie together, and every other blue coming from the loom(s) sides together with the keyless going to each of those sides of the equation, but still nothing.
I saw other forums with people talking about a yellow wire, but I've done this exact scenario in this writeup on the green and yellow wires as well. As you can see I have quite some TIME into this and I'm beyond frustrated. Can someone please advise before I jump to the moon? Pics attached of my current factory setups.
Thank you!
Last edited by nehuge; Aug 31, 2019 at 07:05 PM.
Reason: too many attachments
I know this thread is old, but I'm wondering if you got it situated. I'm currently hooking up the amazon special to my 95 E300. It also has the 6 wires (2 of each color) going into the pump. I've having trouble with wiring also. My unit clicks and the pump will run when you press lock or unlock. However, the it will not lock any of the doors. How did you get yours to work?
I know this thread is old, but I'm wondering if you got it situated. I'm currently hooking up the amazon special to my 95 E300. It also has the 6 wires (2 of each color) going into the pump. I've having trouble with wiring also. My unit clicks and the pump will run when you press lock or unlock. However, the it will not lock any of the doors. How did you get yours to work?
Hi there, this ended up being my solution.
It's a long read, but this was like 2 years ago and I've had a LONG last two years, so it's a blur.
That EdFreeman guy if he's still around was ridiculously helpful.
Let me know how it goes!
My wife and I agree, keyless entry on our W124's has been the best upgrade.
That, and I guess the rear view mirror with auto dimming, garage door opener and compass built in made just for W124 (from Rik Johnson at rik@2phast.com)
Thanks for the quick response!
I figured out what I was doing wrong. I didn't read the first part of the instructions about programming for the central vacuum system.
I didn't get it to work correctly yet. It will lock when you press the lock button but it will immediately unlock. I'm not sure what the problem is unless going with the blue wires instead of the green. I'm going to swap them around tomorrow to the green when I have time. Thanks again!
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