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I wonder how hard it would be to get someone like www.eficonnection.com to make the wiring harness adapters so no cutting or splicing of the factory harness was necessary?
I guess it would depend on the availability of both the male and female early C5 ABS connectors at the EBCM. A person might be able to make their own with the connector from a non-working EBCM.
Originally Posted by Remow2112
Any reason this this would not work on a late model 98? I have the front mount EBCM setiup?
Thanks,
Dan...
It should work the same as for my 99. I would verify the 98 wiring is not different prior to cutting wires.
I'm the happy owner of a functional 98 (non AH) with a "properly functioning" ebcm.
The though of not having a fix is daunting if it does go, I'm kinda screwed. having the AH sensors "faked" could be an option? I have a fairly decent knowledge of serial communications and I'm a system administrator so perhaps we could just figure out what feedback the ebcm wants?
Thanks for investing the time into this man!
HMMMMMM,,,,,, AH has several INPUTS. Individual wheel speeds from each wheel from the WSS, YAW input from an accelerometer, forward acceleration from and accelerometer, Steering wheel position from the SWPS, and brake pressure from the PBS.
I seriously doubt that you can cobble anything together to FAKE all that data from the system..
Congrats to you, Caddy, this is a great accomplishment! I forget to check this part of the forum too often and I see it's a big mistake. Since I have an '02, I fortunately don't have to deal with this. In my search for my second C5, I passed up many nice cars because of this problem. There are so many interesting parts of your article and the thread responses. To be brief, since I do most of my own work, and this is my second c5, many of the mods I made to the first one take less than half the time. I'm sure a very significant amount of Caddy's time was spent on research, check/recheck multiple times, cut/bend/fit till it's right, and the exhaustive process of figuring/testing out the wiring. Caddy has given anyone willing to take on the job a terrific framework to go by. Those who mentioned experience with tube bending and electronics have another step up.
Having done the EBCM "resolder" on my first one, and talking a good friend thru the job on his, I'm not afraid to do it again. That is worth something.
Gotta love this forum. Great job everyone!
I'm the happy owner of a functional 98 (non AH) with a "properly functioning" ebcm.
The though of not having a fix is daunting if it does go, I'm kinda screwed. having the AH sensors "faked" could be an option? I have a fairly decent knowledge of serial communications and I'm a system administrator so perhaps we could just figure out what feedback the ebcm wants?
Thanks for investing the time into this man!
Put a serial port onto the data bus and start logging the data and figuring out what it is then. The cluster must expect some type of communication with the EBCM or else it displays the service messages and/or the light.
Originally Posted by Mike94ZLT1
I wonder how hard it would be to get someone like www.eficonnection.com to make the wiring harness adapters so no cutting or splicing of the factory harness was necessary?
Even if they found the female connector they'd likely have to make some sort of box for it to mount on so they could attach the wires and seal it. I doubt it'd be very practical, and likely VERY expensive.
if you take the time to remove the pins from the newer design and soldered them to the wires, you wouldn't need to splice and have butt connectors everywhere. it's just more time.
Does this use the older manual prop valve for brake proportioning, or the later electronic control? I'm new to Corvettes, but it looks like it would use the electronic proportioning.
Caddy 2006 ive read this thread and copied your re pin schematic I'm going to attempt this myself I was curious as to what you did with the proportioning valve under the master cylinder ive included a picture for
easy referance
Caddy 2006 ive read this thread and copied your re pin schematic I'm going to attempt this myself I was curious as to what you did with the proportioning valve under the master cylinder ive included a picture for
easy referance
That proportioning valve is no longer needed with the later model unit. The later model hard brake lines go directly from the master cylinder into the BPMV. The BPMV/EBCM handles all the proportioning duties.
Caddy 2006 ive read this thread and copied your re pin schematic I'm going to attempt this myself I was curious as to what you did with the proportioning valve under the master cylinder ive included a picture for
easy referance
Picture thief. Glad it's getting some more use than what I am doing with it
No proportioning valve. Just this brass elbow essentially and doesn't have any wires on it.
Looks like I'm gonna be like @tdteel1999 and try this too. Think it'll work on a 2000?
A couple pled of questions, my 2000 frc with active handling doesn't have a porportioning valve. The brake lines from the master run straight into the BPMV. So maybe I can just clean all that out like the 99 and move on?
For the EBCM connector, did you only splice into the 6 wires as shown in the original pic? Looks like it, but wanted to verify. I know the plugs are different so wondered how you did that.
No proportioning valve. Just this brass elbow essentially and doesn't have any wires on it.
Looks like I'm gonna be like @tdteel1999 and try this too. Think it'll work on a 2000?
A couple pled of questions, my 2000 frc with active handling doesn't have a porportioning valve. The brake lines from the master run straight into the BPMV. So maybe I can just clean all that out like the 99 and move on?
For the EBCM connector, did you only splice into the 6 wires as shown in the original pic? Looks like it, but wanted to verify. I know the plugs are different so wondered how you did that.
If the proportioning valve isn't on yours - I would just swap out the hard brake lines from a late model C5 (so they will line up with the fittings on the late model BPMV).
ALL connections on the late model EBCM connector have to be spliced into the wiring on the car. I just showed an in-process picture to illustrate the process.
Does this mean for a 99 owner like myself who does not have or want AH, that this won’t work?
That's correct - all C5s from 2001-2004 had active handling as standard.
A conversion might still be feasible - but more wiring would have to be done to include all the accelerometers used by active handling (that weren't installed/wired on the early cars without active handling).
Has anyone else completed this tutorial? I'm trying to decide weather to stock pile a used ebcm, swps and modulator valve (which will cost me a **** load) or just buy the parts for conversion should the time come when one of these critical components fails.
It looks like the ebcm on the early model c6's is now discontinued also, so I guess we will see a thread pop up over on the c6 forums within due course. Really struggling to recommend GM with there complete disregard for their older customers.
I have an early '98, EBCM in rear, with AH and 1255 code. This solution is an attractive option, but I am wondering if doable. The most obvious issue I see is that the rear brake proportioning valve on my car has no sensor and no wires, so nothing there to wire to the EBCM. I'm not even sure it's a proportioning valve, it's so small it looks more like a splitter. Does that kill the swap right there?
Also, there is not a lot of detail on the EBCM connector rewiring. The other thread referenced by the OP regarding pinout mentioned a few connections that simply didn't line up. Were these just left unconnected?
I have an early '98, EBCM in rear, with AH and 1255 code. This solution is an attractive option, but I am wondering if doable. The most obvious issue I see is that the rear brake proportioning valve on my car has no sensor and no wires, so nothing there to wire to the EBCM. I'm not even sure it's a proportioning valve, it's so small it looks more like a splitter. Does that kill the swap right there?
Also, there is not a lot of detail on the EBCM connector rewiring. The other thread referenced by the OP regarding pinout mentioned a few connections that simply didn't line up. Were these just left unconnected?
I don't know if you already read this other thread (it has a lot of very organized info). There's also this other one about a current project. Perhaps you guys could exchange info and benefit others at the same time.
Just did this conversion over the last few days. Got everything in the car but still have a few codes. need to go over the wiring to make sure I didn’t miss anything. Great write up man helped allot. Hope to have the bugs worked out this weekend/next week
AH has several INPUTS. Individual wheel speeds from each wheel from the WSS, YAW input from an accelerometer, forward acceleration from and accelerometer, Steering wheel position from the SWPS, and brake pressure from the PBS. 
Glad it's getting some more use than what I am doing with it
