'01+ EBCM in 97-00 C5
Thread Starter
Instructor
Joined: Jun 2014
Posts: 236
Likes: 53
From: New Zealand
The safety inspection is to check that the "abs self check completes" Therefore the lamp has to illuminate when the engine/ignition is started, and then extinguish a few seconds later to indicate a successful check. Simply pulling the bulb out would not work, as then it would not light up upon engine start. Also the DIC saying ABS Fault would be enough to fail the inspection.
I am in the process of locating an auto electriction to do the complete rewire to an 01+ ABS system, as the car cant be driven without the ABS module working.
I understand this will cost a lot, but i dont really have a choice.
Only other option would be to link the ABS bulb up to the engine light so it illuminates on startup, and then disconnect the DIC. I guess in theory this would trick the inspection..Any thoughts on this?
I am in the process of locating an auto electriction to do the complete rewire to an 01+ ABS system, as the car cant be driven without the ABS module working.
I understand this will cost a lot, but i dont really have a choice.
Only other option would be to link the ABS bulb up to the engine light so it illuminates on startup, and then disconnect the DIC. I guess in theory this would trick the inspection..Any thoughts on this?
Melting Slicks
Joined: Jul 2004
Posts: 3,092
Likes: 120
From: orlando florida
St. Jude Donor '15
Why go through all of that? Get with aesautoparts or vettenuts.net and see if they have an ebcm. Way cheaper. I just went over the wiring schematics at work. For the most part, it is wire for wire. There are a few less wires for the 01+.
Thread Starter
Instructor
Joined: Jun 2014
Posts: 236
Likes: 53
From: New Zealand
Simply because its replacing with a used part, that will probably fail again soon...
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
I looked at the schematics again and the early cars also have an extra 20A constant power feed and a "brake pressure differential switch" that I can't find on the 04 schematics. So, a couple more wires to leave out basically.
I have a 98 without AH or JL4 option and it just has this in-out block with a button on it between the front master cylinder outlet and the ABS system. Do some of the cars have a full combination valve or a different valve both master cylinder lines go through?
I have a 98 without AH or JL4 option and it just has this in-out block with a button on it between the front master cylinder outlet and the ABS system. Do some of the cars have a full combination valve or a different valve both master cylinder lines go through?
Melting Slicks
Joined: Jul 2004
Posts: 3,092
Likes: 120
From: orlando florida
St. Jude Donor '15
anyway, here's the diagrams. i did the labeling to cross reference going from 2000 to 2001. these connector views are from alldata. anyone with actual FSM can chime in. only thing i don't have is the two wire connector under the main connector.
list of differences
2000 - D doesn't transfer to 2001
2000 - 7 doesn't transfer to 2001
2000 - 23 doesn't transfer to 2001
2000 - 19 doesn't transfer to 2001
2001 - G not found on 2000
2000 part one
2000 part 2
2001 part one
2001 part 2
list of differences
2000 - D doesn't transfer to 2001
2000 - 7 doesn't transfer to 2001
2000 - 23 doesn't transfer to 2001
2000 - 19 doesn't transfer to 2001
2001 - G not found on 2000
2000 part one
2000 part 2
2001 part one
2001 part 2
Last edited by mrr23; Aug 10, 2015 at 06:55 PM.
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
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.
Melting Slicks
Joined: Jul 2004
Posts: 3,092
Likes: 120
From: orlando florida
St. Jude Donor '15
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.
Last edited by mrr23; Aug 10, 2015 at 07:01 PM.
Melting Slicks
Joined: Jul 2004
Posts: 3,092
Likes: 120
From: orlando florida
St. Jude Donor '15
i have that. it is just a proportioning valve to limit pressure going to rear.
Last edited by mrr23; Aug 10, 2015 at 07:34 PM.
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Le Mans Master
Joined: Mar 2011
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From: Columbia SC
Hptuners doesn't deal with bcm modifications. I asked about removing the abs option through the bcm so the lights would be off and got accosted for it. Got called a scammer if i ever sold the car. So don't expect any help in that area around here. They'll just tell you to buy the part and fix it the right way.
Everytime you turn the key on the dic shows abs and traction control messages. There is a place that makes a module to automatically simulate pushing the reset button to clear messages. A simple box that you set how many times to hit reset. He posted on here about it.
Everytime you turn the key on the dic shows abs and traction control messages. There is a place that makes a module to automatically simulate pushing the reset button to clear messages. A simple box that you set how many times to hit reset. He posted on here about it.
Melting Slicks
Joined: Jul 2004
Posts: 3,092
Likes: 120
From: orlando florida
St. Jude Donor '15
still no. there is nothing in the PCM that hptuners pulls up. hptuners only deals with engine and transmission.
Thread Starter
Instructor
Joined: Jun 2014
Posts: 236
Likes: 53
From: New Zealand
Thanks guys. I'm still trying to find an auto electrician who is game enough to do the job. Will keep you posted. If anyone knows anyone in New Zealand who is willing to do it, hit me up!
Instructor
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Le Mans Master
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From: Columbia SC
Race Director
Joined: Apr 2007
Posts: 11,152
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From: South Western Ontario
The PCM has no control over what the EBCM is doing. You still get the AH/ABS/TC operation of the EBCM even when you completely disable the torque control in the PCM. You also still get all AH/ABS/TC messages with the torque control in the PCM disabled.
With the cluster still showing issues with the EBCM even with it completely dead, I'd have to think either the cluster or the BCM is polling the EBCM and throwing those warning when it doesn't get a response.