DIY: Upgrading stock keyless entry to Accord / CR-V style fob-head key

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Old 10-01-2005
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Arrow DIY: Upgrading stock keyless entry to Accord / CR-V style fob-head key

I thought I'd throw this up in the DIY section since the original discussion took place in "I.C.E" where it seems less likely to be discovered by someone looking for such a thing.

A lot of people seem to ask whether it is possible to get an OEM Honda "fob-head key" keyless remote transmitter (the kind on Accords and now on the '06 Civics) to work with a 7th gen Civic. I don't know why but I felt compelled to take it upon myself to find out - the answer is YES, but it could end up being more expensive than you'd think it to be worth, depending on how/where you come up with the parts/labor.

I did this on my '04 EX Coupe and it went flawlessly. It SHOULD work for all 7th Gens, but I'd love it if someone with an '01-'03 could confirm whether any revisions would be needed for those cars...

Here's the short story:

===

If you have a 7th gen with the "Sidewinder" style key (the one with the key tracks cut on the outside flats of the shaft, generally '04-'05), then by far the EASIEST way to do it is to swap an '05 CR-V keyless RECEIVER unit into your Civic. It is totally plug and play! Once it's in, you get yourself the CR-V key cut and programmed to your car and you're done. That's it!

1 CR-V kls receiver Honda Part Number: 38385-S9A-A01
1 CR-V fobhead key Honda Part Number: 35111-S9A-305

To get to the receiver, Follow the stereo install DIY...

http://www.7thgencivic.com/forums/sh...d.php?t=211259

...up to the point where you have the center console out. Look inside the open center of the dash (above and to the right of the cupholders, basically behind where the cig lighter/accessory outlet is) and you will see the keyless receiver in there on the right, a small black box about the size of a pager, with a green 5 pin plug but probably only 4 wires. It is visible in this photo:

http://www.2k4civic.com/albums/civic.../images/07.JPG

R&R and reassemble! Then you will have to have either a dealer or locksmith program the new key's immobilizer chip into your car's system (sorry there is no DIY for that process that I am aware of) and then program the new remote in:

http://www.collegehillshonda.com/art...ticle_35.shtml

...AND YOU'RE DONE.

If your Civic has a "normally" cut key (eg: '01-'03) then in addition to the above, you will also need to disassemble the CR-V key as well as a "normal" key (blank or already cut) and transplant the normal key shaft into the CR-V key head. There is a DIY for this from a TSX owner here:

Writeup:
http://www.acuraworld.com/index_file...cord%20key.htm

Images:
http://www.acuraworld.com/index_file...d%20key_files/

If you use a CR-V key though you will NOT also have to swap the immobilizer chip out (unless your normal key's chip is already programmed to your car and you don't want to have to have the new one programmed afterward) because the CR-V chip is already the same (type 3) as a Civic one.

===

Now the background details, for those who want it...

The CR-V fob-head key is the key of choice because it comes from the factory with the correct immobilizer chip (type 3) and sidewinder key shaft ("F" stamped) already on it. The only thing that doesn't jive with the Civic is the transmitter frequency, which you deal with by putting the CR-V receiver in your car.

The Accord and '06 Civics don't have a stand-alone keyless receiver, on those this is integrated into other parts such as the immobilizer pickup unit. I skipped even looking down that road because I wasn't sure what effect swapping that out might have on a 7th gen Civic ECU or if it was even possible. There seemed really no point in going to all that anyway when the CR-V receiver swapout is so darn simple and clean.

The Accord key is not suitable because it uses a different (type 4) immobilizer chip and a different ("V" stamped) key shaft, neither of which are compatible with the 7th gen Civic. The key shaft could be sanded down on both flat sides to make it narrower like the F stamped key, but why? One thing to note, the transmitter innards do appear to be identical (FCC ID: OUCG8D-380H-A) so if you were doing a "normal" key shaft mod AND sticking a preprogrammed immob chip in, then you could use an Accord key head transmitter, if you happened to already have one laying around.

For further background reading, FCC schematics of the receivers, and my misc ramblings to myself, the original thread where all this was hashed out is here:

http://www.7thgencivic.com/forums/sh...=211658&page=2

So consider this my one contribution to Civic society Enjoy!

Last edited by seattlex19; 10-01-2005 at 09:57 PM.
Old 10-01-2005
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I have an '01 and if I had the time and money to do this god knows I would...I've wanted to do that since i saw the sidewinders on the hondas.....

:envy: to all who've done this =rep for you
Old 10-01-2005
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A couple more thoughts to toss on the heap...

Being the naturally curious type, I actually did TWO keys for my car, one of them each way.

The first key, I actually bought a brand new CR-V part numbered fob-head key from a dealer parts department, had the service department cut it and program its immob chip and keyless transmitter into my car.

The second key, I made myself, to test that procedure as well, by taking a mis-cut key from someone's Accord that the parts guy would have thrown away but instead gave me to experiment with, and my original sidewinder main key, then disassembling both keys, and swapping my key's pre-cut shaft and pre-programmed chip into the Accord head, otherwise following the TSX guy's DIY procedure

Both keys turned out great. The reason I mention this is, even for those of you '04-'05s for whom the CR-V key already has the right chip, if you wanted to take apart the key you already have to put the pre-programmed chip in, you could then avoid the expense of having the new chip programmed into your car. One way to reduce the expense involved (although you're sacrificing your old key in the process).

If you wanted to go one step further, like I did with the experiment, and also swap the shafts out, you could then even avoid having to have it cut. I HAD TO do it because it was an Accord key with the wrong chip & shaft, plus I wanted to test the procedure. Honestly though you should not have to do all that if you have the CR-V key, even if you swap the chip, the dealer would still probably cut you the key for free if you bought it at their parts counter.

Another note, if you are going to shave the head off an original key to get to your preprogrammed chip for whatever reason, BE EXTREMELY CAUTIOUS!!! You can easily damage the chip if you are careless. I deviated from the TSX DIY in that I shaved my key head apart using a box cutter style razor blade shaving thin slices off the plastic, working from the outer edges inward, until I got down to the metal surrounding the chip on the sides.

You will find OUR chips are not even actually chips like the Accord's, they are actually what looks like a tiny coil inside a glass tube, with that inside a rubber shock absorber. This mess sits encased in the molded plastic, directly under the lower half of the "H" on the head, and runs vertical almost down to the base of the head, so be careful in that region when shaving.

Finally, where the TSX guy says he drilled a new screw hole in his modded shaft and then used epoxy to fasten it into the head, I did that a bit different too. Actually the Civic metal is shaped differently, right where the screw would go, there is nothing, because that's where the cutout for the chip was, so I shaped the new "T" on top of the shaft to fit into the recess of the transmitter case, then, instead of epoxy, I used this steel-impregnated epoxy puddy ($3 at Home Depot) called "FastSTEEL", stuffed it into the recess, stuffed the new shaft T into it, then stuffed some more on top, closed the case, adjusted the shaft straight, then put the screw in, let it set up (quick, only a couple minutes) then DELICATELY took the screw out and opened the case, cleaned any excess out, then delicately put back together. It pretty much formed an entirely form fitted new steel head onto the makeshift T on the shaft, and this key is now probably even stronger than the stock one that was molded in!

I'll post another addendum if I think of anything more to add... Peace!
Old 10-02-2005
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I did forget one bit about the shaft transplant. I can't say what this would be like doing a "normal" shaft swap (since I did it with my original sidewinder) but on my key I forgot to include one detail...

When you have gotten the chip out and you have cut the metal head down to a "T" on the head end of the shaft, I said above that there was no key metal there for the screw to go into. This is only partly accurate.

Now that I think of it, there was a very slight bit of metal showing in the screw hole of the plastic case when I test fitted it all together, just enough for the screw and key shaft to foul against each other (making neither straight) but not even close to enough for threading.

In order to get the screw & shaft both straight, I actually had to dremel that tad bit of metal out of the T, making it so there really WAS no key metal showing in the hole. Then the metal epoxy did the job of bonding the T into the case, and forming threads for the screw, when gently screwed into the setting epoxy
Old 10-02-2005
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Ahhhh, one more thing - a quick FYI about the CR-V receiver part numbers...

There are TWO different receiver part numbers available on '05 CR-Vs. It seems the numbers are different depending on whether that CR-V was built in Japan or England.

I've talked this over with a dealer parts guy who was unsure of any differences but stated there is likely no difference at all other than just where the receiver was made.

The Japanese CR-V part number: 38385-S9A-A01
The British CR-V part number: 38385-SAA-A01

I've researched it "on paper" and it looks like either one should work fine, because they BOTH use the same key part number: 35111-S9A-305, and thus the same transmitter = same frequency etc etc, but since I've only physically tested it with the Japan part, that is the number I posted for the DIY.

One last thing, in the parts databases the number has the full "A01" on the end, but on the sticker on the unit itself, it only says "A"
Old 10-05-2005
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I'm so confused but I want to do this with my 02 lol.
Old 10-06-2005
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The only part that confused me was deciding whether or not the parts were worth that much money!
Old 10-06-2005
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how much does it cost to get the reciever, fobhead key, gettin it cut, and programmed at the dealership? also got any pics of the steps in which if we gut and do all the things on our keys to transplant to the crv fob stuff
Old 10-06-2005
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well good write up. I think i'd rather have those switch blade keys though, you see on volvos and other european cars.
Old 10-07-2005
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The CR-V fobhead key can cost anywhere from $50 up to about $80 depending on which dealer you buy it from, the CR-V receiver unit new from dealer parts goes anywhere from $100 up - for both of these definitely shop around!! Dealers set their own prices and some are way cheaper than others for the same parts. Most of the parts guys I talked to said the shop would probably cut the key free if you bought it at their parts counter, but this too could vary depending on where you go. Then there is the programming of the immob chip which generally gets charged at shop labor rate for 1 hour minimum.

All together going start to finish at a dealership you could spend anywhere from $250 on up to whatever insane prices they have where you shop. There are lots of ways to bring the total costs down though.

For example, buy ONLY the new key at the parts department. Then look around wrecking yards or online for the receiver, you might find a used one cheaper, or someone parting out who would sell theirs for less etc. Then you could go to a locksmith for the programming as they would almost always be cheaper than a dealer on labor.

One more idea, if you have the inclination to do a pre-cut shaft & pre-programmed chip transplant from one of your existing keys, then you can avoid altogether the chip programming labor, and be able to use any key (CR-V, Accord etc) with the proper FCC ID (OUCG8D-380H-A) on the back of the key head, so you could find a used key at a junk yard, or as I did, get one free from a parts guy because it had been mis-cut and was headed for the trash can! Of course the shaft & chip transplant is a lot of fidgety detail work and not for the careless! - but is one more way to knock overall cost down.

Like me, if you got a used key cheap, did the shaft/chip swap yourself, etc etc, you could probably pull the whole job off start to finish for less than $100...

PS: For a DIY on the fob head to other shaft/chip transplant, scroll up to my first post and look under "If your Civic has a "normally" cut key"

PPS: I have seen some aftermarket switchblade style key cases for 7th gens on e(vil)bay but they look pretty iffy quality wise...

Last edited by seattlex19; 10-07-2005 at 03:56 PM.
Old 10-09-2005
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Any pics of these fobhead keys please?
Old 10-10-2005
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The fob head key looks like this...



The head is about 1 & 1/2 times the size of the "normal" key head, but is still quite a bit smaller than the separate standard remote transmitter.
Old 10-10-2005
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NOTE FOR THOSE OF YOU WHO SKIMMED THROUGH THE DIY:

YOU MUST use the correct key transmitter and the correct receiver!!

If you just grab ANY fob head key and/or ANY receiver from ANY CR-V it may not work, they have to be the right pair.

If you are not sure, BEFORE you waste money or time, please scroll back to the first post for the receiver and key part numbers, or if you got your receiver or key third party, be certain the receiver has the correct part number on the label and key has the correct FCC ID on the back of the head


Last edited by seattlex19; 10-10-2005 at 09:31 AM.
Old 10-10-2005
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Soooo, if I sent you a spare transmitter and key from my car could you make this for me? LOL
Old 10-10-2005
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No, but if you run into trouble while doing it yourself, I can post advice to keep you on track
Old 10-10-2005
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hahahaahhaha
Old 10-10-2005
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i like this idea, because it has a trunk release, so does that mean you can get the trunk popper from a 98 accord like people have, and now you have it?
Old 10-10-2005
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I don't know, because I don't have a trunk pop motor to experiment with (yet!)

I do know this though, the pinout is exactly the same on the CR-V receiver as it is on the Civic one you would be removing, AND both have the same 4 wires coming off, soooooo - it seems logical that since the CR-V has a functioning rear door release, the signal would also be getting sent into the Civic system from the CR-V receiver if you were to press that button on the remote.

This says to me, all one would have to do (once that pop motor is installed) would be to determine what comes next in line, and complete the circuit as needed...

1: Push trunk button on transmitter
2: Receiver sends "pop trunk" signal out on the existing wiring
3: That signal is received by - by what? Ecu? Relay? Or?

I'd say time to bust out the schematics and look for whatever should come next

If I get around to trying to integrate the trunk pop motor into my system I'll let you know what happens on my end...
Old 10-10-2005
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Ah hey I have an idea...

The Canadian "Acura EL" came with a remote trunk release didn't it?

Could we just have a late model EL owner trace the wiring from their trunk release motor back to tell us where it is connected? Or would that be too easy?
Old 10-10-2005
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Oh, so this is to have a wireless remote and key all rolled up into one neat package... nice.
Old 10-10-2005
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YEP, and if we can just get a line on where the EL's trunk motor signal is routing into the trunk from, we could perhaps add the "missing wire" to the Civic and toss the power trunk release into this mix too!
Old 10-10-2005
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thanks i would apprecaite it, yea i thought of the acura el thing, but i know people have used a 98 accord one, and hooked it up to there alarm, i have no idea what would be involved but that does seem sweet to have everything on one key, even if it is a big key
Old 10-11-2005
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Originally Posted by seattlex19
Ah hey I have an idea...

The Canadian "Acura EL" came with a remote trunk release didn't it?

Could we just have a late model EL owner trace the wiring from their trunk release motor back to tell us where it is connected? Or would that be too easy?
I'll try and take some pics if I get a chance this week.
Old 10-11-2005
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Runner, I am thinking it should be doable. The reason people have, in the past, used only aftermarket alarms to do a remote trunk release was because the stock Civic keyless receiver unit could not be set up to handle a trunk/option signal (whether that is true or not I don't know, but that's what folks generally seem to believe). Since we are already installing a CR-V receiver for the "fobhead mod" and we KNOW it can do that, then it should be (in theory) a simple matter of installing a release motor and then running the wire up front under the dash, connecting it to (?) wherever the EL's is coming from. About the motor, I imagine the Accord one would be fine to use, in mentioning the EL I was just getting at the fact that we could probably come to a conclusion faster if someone familiar with the EL could indicate to us how their release motor is wired from the factory.

EL-Sport, thank you for chiming in! I'm not really sure how much we would be able to tell from pictures, since your trunk release wiring I would assume starts at the motor and quickly vanishes into some harness. What we really need is someone with an EL wiring diagram / schematic (or equivalent knowledge) who could tell us, when that wire comes out the other side (presumably under the dash) what is it connecting to, and so on, until we reach the point where the signal is coming out of the keyless receiver, thus we could see what would be involved in "completing the circuit" required for the fobhead key to actuate the trunk.

Thanks again to all for your participation!
Old 10-13-2005
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PS from what I've read, it's the 2001 Accord trunk release that you want because it's an updated design (plus it has that cool glow in the dark button to let yourself out of the trunk - just in case )
Old 10-14-2005
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What does the programmin at the dealer encompass?? Is it only with this programmin then I can use the new key to do a keyless entry?? Is there a DIY for the key 2 'sync' itself to the keyless receiver and vice versa??

Or is it simply a case of programmin the immobilizer code??

Or a case of both??
Old 10-14-2005
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"Programming" the new key actually refers to *TWO SEPARATE* issues:

1: Programming the keyless entry remote function. This one you can do yourself for free, just go back to the original post and locate the link I included that leads to the instructions on how to program a new remote (obviously, you want the CR-V receiver installed before you do this and btw the CR-V program procedure is exactly the same as stock Civic)

2: Programming the IMMOBILIZER CHIP to be recognized by your car's immob system. This is the one you need to go to a dealer or locksmith to get done. To the best of my knowledge this can NOT be done yourself (that is, unless you own the same diagnostic/programmer unit that they have, which is far far more expensive than just paying them to do it)

As mentioned previously, you can avoid having to have the immob chip programmed if you are willing to sacrifice one of your existing keys, you can remove the immob chip that is already programmed to your car from that key and transplant it into the new CR-V key... AGAIN THIS IS NOT A TASK FOR THE CARELESS OR SLOPPY! It would be pretty easy to damage the chip unless you are a careful worker. IT CAN be done (hey, if I could do it... ) but if you doubt yourself at all, just get the new immob chip programmed by a pro.

Last edited by seattlex19; 10-14-2005 at 05:47 PM.
Old 10-16-2005
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This is great!!
Thanks alot for the information...
Old 10-16-2005
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My pleasure!

So about the trunk release, do we have any Canadian EL owners in the house with a wiring diagram (or the knowledge of their car's electrical system) to show us exactly where the stock wiring connects from the trunk release back up to the dash? We need to get to the bottom of that little mystery so we can figure out whether we can do this trunk release with the fobhead mod...

Last edited by seattlex19; 10-16-2005 at 01:24 PM.
Old 10-16-2005
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had a friend that did this DIY seems to work great for him and its pretty sweet too


Quick Reply: DIY: Upgrading stock keyless entry to Accord / CR-V style fob-head key



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