'01+ EBCM in 97-00 C5
Heel & Toe
Joined: Jun 2016
Posts: 23
Likes: 1
So if you look at the earlier posts in the thread, there are JL4 annotated pins on both the 2000 and 2001 EBCM connector pinouts. The sticky thread in this forum on the '99 stated that this retrofit would only work on AHS cars. As I read those connector pinouts though, there should be such a thing as a non-AHS '01-'04 EBCM, or at least the '01-'04 EBCM should work even if the car did not have the JL4 option.. Should that not retrofit to my car, since none of the JL4 pins would be functional on either the donor car or my car?
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
Ah, OK thanks, I guess that's what people are calling AHS even if that's not the RPO code description text.
So if you look at the earlier posts in the thread, there are JL4 annotated pins on both the 2000 and 2001 EBCM connector pinouts. The sticky thread in this forum on the '99 stated that this retrofit would only work on AHS cars. As I read those connector pinouts though, there should be such a thing as a non-AHS '01-'04 EBCM, or at least the '01-'04 EBCM should work even if the car did not have the JL4 option.. Should that not retrofit to my car, since none of the JL4 pins would be functional on either the donor car or my car?
So if you look at the earlier posts in the thread, there are JL4 annotated pins on both the 2000 and 2001 EBCM connector pinouts. The sticky thread in this forum on the '99 stated that this retrofit would only work on AHS cars. As I read those connector pinouts though, there should be such a thing as a non-AHS '01-'04 EBCM, or at least the '01-'04 EBCM should work even if the car did not have the JL4 option.. Should that not retrofit to my car, since none of the JL4 pins would be functional on either the donor car or my car?
Heel & Toe
Joined: Jun 2016
Posts: 23
Likes: 1
Is it that all '04 have the brake pressure, accelerometer and yaw sensors whether JL4 or not? Is it that JL4 wasn't optional? Is it that the ECBM was programmed for non-JL4 in a way impossible to duplicate by DIY?
Burning Brakes
Joined: Oct 2013
Posts: 1,030
Likes: 72
From: Seminole, FL
If you have this tidbit of information, I'd beg your input.
I'm doing my 2000 convertible.
On the two plugs, the "C" position is circuit 1787, Steering.
Old plug has it. New one doesn't... ????
I'm doing my 2000 convertible.
On the two plugs, the "C" position is circuit 1787, Steering.
Old plug has it. New one doesn't... ????
Instructor
Joined: Jul 2007
Posts: 161
Likes: 2
From: Le Claire IA
St. Jude Donor '08-'09-'10-'11-'12
@mrr23 @grasshopper645 @Caddy2006
I just wrapped up this project on my 99 FRC with Active Handling.
Can't express enough thanks to those who took the time to help the Corvette community on this!
Cheers,
Bryan
I just wrapped up this project on my 99 FRC with Active Handling.
Can't express enough thanks to those who took the time to help the Corvette community on this!
Cheers,
Bryan
Thread Starter
Instructor
Joined: Jun 2014
Posts: 236
Likes: 53
From: New Zealand
@mrr23 @grasshopper645 @Caddy2006
I just wrapped up this project on my 99 FRC with Active Handling.
Can't express enough thanks to those who took the time to help the Corvette community on this!
Cheers,
Bryan
I just wrapped up this project on my 99 FRC with Active Handling.
Can't express enough thanks to those who took the time to help the Corvette community on this!
Cheers,
Bryan
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
8th Gear
Joined: Nov 2019
Posts: 8
Likes: 2
Ground wire needed
It's hard to even trust the GM schematics. The 98 schematic doesn't show the backup lamp input but the 99 does.
Pin 17 does transfer to 28 - but it goes to the ESC module so it doesn't matter if you don't have ESC.
pin 23 does not transfer.
The ground circuit 1250 that would go to pin G on the 2001 does exist on the earlier cars, it's just connected to the pump motor and not in the connector.
So, we seem to have come up with 4 extra wires that won't be needed.
Pin 17 does transfer to 28 - but it goes to the ESC module so it doesn't matter if you don't have ESC.
pin 23 does not transfer.
The ground circuit 1250 that would go to pin G on the 2001 does exist on the earlier cars, it's just connected to the pump motor and not in the connector.
So, we seem to have come up with 4 extra wires that won't be needed.
Intermediate
Joined: Nov 2022
Posts: 30
Likes: 4
From: Australia
You found information that said to measure the DC voltage, right? Well, the analog DC voltage output doesn't exist on a 2001-2004 sensor so that method won't work on those sensors. All that exists are the phase A and B signals, which are basically digital on-off signals.
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,669
I'm looking at doing this conversion on my 98 without Active Handling by adding the yaw and lat-G sensors too. It seems like a lot of people are changing their early SWPS for a late sensor. Do you know if there's a reason the early sensor can't be used? It looks like the early SWPS just has 2 extra outputs - INDEX OUT and ANALOG. I would be surprised if the phase outputs act differently in the new sensor.. surely I can just drop those wires?