New 4G Key/Keyless entry in a 2G?

[OddNotion]

While at the dealer I caught a glimpse of a 4G key. They have the trendy new setup in which the Keyless entry is integrated into the key itself.

I'm trying to determine if the 4G transmitter is compatible with the 2G system.

The key at the dealership (in a display case) was a little different than mine. The blank part on which the key is cut seemed to be opposite to my own.
I'm not sure if it was for an Evo, eclipse, or what.

Then when checking e-bay I saw several 4G Eclipse keys and the pics always showed the blank as being similar to mine, and opposite the one in the Mitsu display case.

So before I waste 60 bucks figuring this out, has anyone tried to program his or her car with a 4g transmitter?

If not, call me the guinea pig.................

 

[Gee-Es-Tee]

so... how did your experiment go?

 

[NeMiZiS]

3g's have that same kinda thing, were the keyless entry is part of the key. You might have better luck with one of those.

 

[Defiant]

Check the FCC ID: GQ43VT6T. If it doesn't match (it won't), the 2G security circuit will never learn its code.

 

[fuzzydoodle]

Does it have to be GQ43VT6T exactly or can it be any one with GQ4 starting? Because if you look up a talon keylessfob on ebay or what ever it will tell you there is one that works with any starting with GQ4...

 

[Defiant]

No, it has to be exact. However, the circuit board for the DSM remote isn't very big, and I'm sure it wouldn't be much of a project to either build it into the head of a key, or maybe one of those switchblade things they use on VWs and stuff.
http://www.dsmtuners.com/forums/newbie-forum/255074-flip-key-vw-style-car-alarm.html
Someone on eBay is hawking a spring-loaded Mitsubishi key, if it has the correct warding, you might be able to use it.....

 

[92_talon_awd]

I'm not sure if this is what you are looking for, but this company sells kits they claim will work with ANY car. I'm planning on getting a set for my 1g.
OEM-Look remote locking systems

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Good luck.

 

[OddNotion]

I finally bought the key from one of the E-bay hacks. It's actually in good condition, but it looks like it was indeed used in some form. The Ebay people glued a new uncut blank into the housing, but the blank is wrong so I'll have to glue an appropriate one in its place.

I'll post some pics and results once I get deeper into this.

The fcc ID is OUCG8D-620M-A

Made by Omron, not TRW

 

[OddNotion]

Here is the initial physical assesment:

The key blank is different from mine. It's just smaller and will need to have the epoxy securing it "dremeled" out. I'm waiting on a blank 2G key from Mitsu.

http://www.4g64.com/gallery/Erin-s-Everything/IMG_0825

The 4G key has a sort of "pod" inside the key that's self contained. It's very intuitive and is quite a bit smaller than my ham sized fob.

http://www.4g64.com/gallery/Erin-s-Everything/IMG_0827

http://www.4g64.com/gallery/Erin-s-Everything/IMG_0828

The Pod opens up in the same manner as my Fob

http://www.4g64.com/gallery/Erin-s-Everything/IMG_0830

These images will show the general size relationships and construction similarities......

http://www.4g64.com/gallery/Erin-s-Everything/IMG_0831

http://www.4g64.com/gallery/Erin-s-Everything/IMG_0832

Finally, the circuit boards themselves in contrast..

http://www.4g64.com/gallery/Erin-s-Everything/IMG_0833

 

[Defiant]

Holy crap. "The morning sun, when it's in your face, really shows your age."

Those pics need to be on here.

How big are the VW/Mercedes fobs with the switchblade key, anyone know?

 

[VelocitàPaola]

I say have a new circuit board designed to fit in the 4G fob, transfer all the old components from the 2G fob and integrate the 4G buttons. It looks like there's some spare room on that old board; they allocated a lot of space for those antiquated magnetic contacts. Plus, I doubt the original fob PCB is more complex than a double-layered board.

 

[OddNotion]

Lol, antique.

If you look at the traces on the old CB, you can tell that more than half of the board is devoted to the "antique" contacts. Negating the components on the other side of the old board, you could probably make a blank of the 4G board that only has the push-buttons mounted on it and just wire them to the corresponding points on the 2G board with the top half cut off. That would fit.

The 4G unit is actually way thicker than the old fob, so mounting a "button board" on top of it would still fit inside the 4G key.

Maybe I'll start selling these

 

[Defiant]

The old board contacts aren't magnetic, they're conductive paint on the bottom of the molded-in button vinyl. Same as most TV remotes.

 

[VelocitàPaola]

They look like ferrite cylinders to me... the same stuff as most magnets, and yes, most tv remotes, game console controllers, etc.. Either way, I prefer to use tactile sensors or SMT pushbuttons as they take up far less PCB real estate.

 

[OddNotion]

I too prefer the SMT pushbuttons.
They provide a positive "click!" letting you know you've done something- as opposed to mushing the little silicone button into my remote, which doesn't unlock the doors, and renders subsequent mushing of increasing force with each unsuccessful mush.

Anyhow, back on topic- I'm going to do an idiot check and see if this thing doesn't work with my alarm system by some miracle.

 

[blackGSX2g]

Any updates on this? I'm interested to see what you found.

Still curious on this. I might be able to get a cut 4g key to play around with, just wanted to make sure I wasn't wasting my time.

 

[VelocitàPaola]

Still curious on this. I might be able to get a cut 4g key to play around with, just wanted to make sure I wasn't wasting my time.

I still think the best approach is to just make a new PCB. I'd be willing to help if you want.