Remow2112

Any reason this this would not work on a late model 98? I have the front mount EBCM setiup?

Thanks,
Dan...

Caddy2006

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.

It should work the same as for my 99. I would verify the 98 wiring is not different prior to cutting wires.

Bill Curlee

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..

BC

chasboy

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!

lionelhutz

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.


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.

mrr23

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.

lionelhutz

You'd have to get new pins to do that. You can most likely find suppliers selling them if you really wanted to do that.

mattastick

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.

TDTeel1989

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

Caddy2006

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.

Fastbird

Picture thief. Glad it's getting some more use than what I am doing with it

grasshopper645

@TDTeel1989

Can't wait to hear if you are successful!

PLEASE keep us updated!

Standi

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.

Caddy2006

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.

Good luck!

Mike94ZLT1

Did all cars after 01 have active handling?

Does this mean for a 99 owner like myself who does not have or want AH, that this won’t work?

Caddy2006

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).

grasshopper645

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.

leadbelly666

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?

GCG

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.

raorlan5850

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