I’ve been reading all about this issue with using newer mirrors with the Homelink, not being compatible with factory alarm setups, etc… great information was provided by everyone including this post (http://forums.bimmerforums.com/forum…mirror+pin+out) and still I wondered…
[me wondering – imagine cloud thought above my head]: “why can’t we just take the ‘alarm’ part of the old mirror out, insert it into the new mirror case, feed it power and get the best of both worlds?”
So i got to crackin cases… you gotta be careful when doing this. I was able to practice on my original one because I knew I wasn’t going to keep it! Use a plastic putty knife from your local hardware store. There are two main releases/catches on the top and bottom. They are about 6 inches apart and something like an inch or so from each edge. If you use the plastic putty knife like the kind in the picture
You should be able to wiggle the edge of it into the separation at least enough to see which side of the mirror’s seam has the catch. The trick is to slip the plastic knife in there enough to see which side the rest of the knife edge needs to go into, then carefully slide the knife along the seam into the opening until it cracks open, hopefully not cracking the catches. Once you get one side open using this technique, it will be more obvious how to open up the other catches.
I present to you this: This is my 1995 CSi mirror taken apart:
You will note the “alarm” portion of the mirror screwed down on the left with a yellow antenna wire along the bottom. The ‘switch’ for something hanging down in the middle of the mirror and to the right, the opening for the photo sensitive cell that drives the whole dimming feature (I think). Also note the way the wires are separated for some reason – not sure if that’s even relevant…
Next take a look at the innerds of a non-compass, E36 mirror with Homelink:
The IC board looks much more sophisticated of course – it’s like 10 years newer. The Homelink unit is to the left, pretty much self contained, only needs power and ground to make it work, yet there’s 10 wires total feeding the 10-pin connector, which is identical, by the way, to my 1995 CSi mirror except that the CSi plug only has 9 wires and obviously the wire to pin assignments are a little different. (yes, I know I need to re-solder/fasten that ground connector for the dimming feature to the outside of the mirror (black loose wire). I will take care of that…
shows my 95 mirror with the alarm receiver portion removed and the internal wires/connector spread apart to help identify their colors. And finally,
shows the new E36 mirror’s internal connector and wire colors.
Now I know that in Frankie’s post about plugging in the newer mirror to the older socket involved switching a couple wires (3 to be exact). He said:
original 1 (brown) to new 10 (ground)
original 2 (blue) to new 1 (reverse signal)
original 3 (yellow/red) to new 3 (power)
So apparently, since there’s so many more wires going on in the 95′ mirror, I’m assuming they have something to do with feeding the alarm signals that it needs? (when I tried to just unhook the 95′ mirror from the car, the alarm sounded and wouldn’t go off unless I re-attached the mirror and hit the unlock on the key fob!)
My goal is to ‘integrate’ the previous mirror’s alarm module, into the new mirror’s chassis so I have Homelink AND the alarm receiver in the new mirror.
So here’s the ask to the gurus:
How do I need to re-wire this thing to allow me to take the alarm module, and mount it inside the new mirror and still feed everything the appropriate signals?
Thank you in advance for any and all help you can provide!
Taylor in Cardiff
Additional Info: This morning I managed to find this at (http://www.baso.no/load.asp?id=85) which appears to be the pinouts for an E39’s electrochromic mirror (my newer mirror with Homelink). Looks like pins 4,5,6,7 are used to send dimming signals to the side rearview mirrors. Do any of the E31s have this?
Now if I could just find the same information about ALL the pinouts of the E31 alarm mirror, then we can try matching them up, splice them together, and see what happens!