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Got the thing out and got the case off. Reading the long post by nvusgt below, I was wondering after the repair, is there no procedure around to bench test the thing? R&R'ing it in and out of the car is not gonna work for me I just had surgery on my neck! This is the perfect bench project for me while Im stuck inside. I really want to make sure the relay works before putting it back. When I took the thing out it was stuck in 1214U, and gave TCS and ABS warnings. Now with the EBCM out, I get codes from PCM and SDM? Sound right? Anyway only one alarm to clear now "Service Vehicle Soon". Runs and drives fine! Car is 2001 and does not have ride control.
I took my ebcm off last sunday and yes obce i turned the car on it gave me a messagesying service vehicle soon. I just reset it. Yesturday i recieved my ebcm back from mandigital. He fixed it for $50. I installed it and all was good just had to erase the active code stored by the previous active control test done by the pcm. Erased codes and started car back up. And all is good. No more abs and active control light or error messages on start up.
Must be! I mean not even a "go away kid you bother me" response?? It's interesting that when some folks post what the perts on this board consider repetitive or FAQ, they get flamed for not first doing a search and spending at least 4 days researching previous threads on the subject. So I do the research, trouble shoot my code, remove the module and then ask a basic yes/no question....and get ignored? It;s obvious none of the perts know how to do this, but none wants to admit it either.
I'm in no hurry to put this back on the car at the moment so I'm tracking down the schema's and plan to remove the main components from the circuit and test as much component level as I can. I also have some local resources who know a bit about these things.
Thanks to Greg00Coupe and datsickz06 who at least tried to engage this thread!
It'd be next to impossible to bench test unless you wanted to build a very complex test setup.
Thanks! I can see now where one might need a complex gig to test full functionality, but there should be a way to unit test the thing. Anyway I re-soldered the relay and other contacts that looked suspect and fiddled around with testing the components I could get to. Re-installed it yesterday and so far so good, NO CODES!
I'm new to Corvettes and this forum. I did a search on this topic because I'm now in the exact same spot. I've removed the EBCM and removed the cover. This thing is a PIA to remove and I'm sure will be a PIA to install. I like to know for sure whether what I'm putting on my car works. Bench testing help eliminate a lot of unknowns. What would be most helpful is a schematic or some other diagram to test, at least, the switch in question. Without such information as voltage and current flow I don't dare try to test this thing out of the car for fear of frying the board.
had the code C1214 sent it to ABS fixer, 200.00 done !!!!! works great
You may not be done with that failure. When checking out the system did you check the resistance between the motor casing in the Brake Pressure Modulator Valve and the motor wiring? If that resistance is less than infinite it is more than likely what caused the relay in the EBCM to fail. If that resistance is less than infinite the heavier duty relay that ABS Fixer will get the system working again but it may not work as well since the pump motor won't run as fast as it should. The increased current flow that caused the first relay to fail will continue to flow and may get worse as the resistance continues to drop all the way to a full short. That will take out the new relay as well. A shorted BPMV motor means the BPMV needs to be replaced in addition to the EBCM if C1214 is shown as the failure code. The C1214 diagnostic states to check that resistance and if it is less than infinite replace both the EBCM and the BPMV. If it reads infinite then replace the EBCM.
I'm new to Corvettes and this forum. I did a search on this topic because I'm now in the exact same spot. I've removed the EBCM and removed the cover. This thing is a PIA to remove and I'm sure will be a PIA to install. I like to know for sure whether what I'm putting on my car works. Bench testing help eliminate a lot of unknowns. What would be most helpful is a schematic or some other diagram to test, at least, the switch in question. Without such information as voltage and current flow I don't dare try to test this thing out of the car for fear of frying the board.
Here is what is available from the GM Factory Service Module:
This still leaves the issue of knowing how things are connected inside the EBCM and what kind of circuitry exists there. We know it has to be a combination of digital and analog circuitry where the digital circuitry acts as the processing unit with more than likely several digital signal tracking algorithms that track the analog signals coming into the EBCM.
Here is what is available from the GM Factory Service Module:
This still leaves the issue of knowing how things are connected inside the EBCM and what kind of circuitry exists there. We know it has to be a combination of digital and analog circuitry where the digital circuitry acts as the processing unit with more than likely several digital signal tracking algorithms that track the analog signals coming into the EBCM.
Bill
Thanks for the diagrams! Do you have the service manuals in electronic form? Do you know where I can find them? The hard copies are way expensive, but if that's my only choice I'll buy them. Better than not knowing.
You may not be done with that failure. When checking out the system did you check the resistance between the motor casing in the Brake Pressure Modulator Valve and the motor wiring? If that resistance is less than infinite it is more than likely what caused the relay in the EBCM to fail. If that resistance is less than infinite the heavier duty relay that ABS Fixer will get the system working again but it may not work as well since the pump motor won't run as fast as it should. The increased current flow that caused the first relay to fail will continue to flow and may get worse as the resistance continues to drop all the way to a full short. That will take out the new relay as well. A shorted BPMV motor means the BPMV needs to be replaced in addition to the EBCM if C1214 is shown as the failure code. The C1214 diagnostic states to check that resistance and if it is less than infinite replace both the EBCM and the BPMV. If it reads infinite then replace the EBCM.
Bill
Maybe not done ???? we opted for the Surge suppression upgrade, as recommended by Brandon at ABS. Bil I figured you are very knowledgeable, but sometimes here on the forum some of you think you know more than the people who fix things for a living ??? a lot is made up over the shortcomings and availability of some parts, 99% of what I post here is "been there done that" more than a few times !!!!
I took my ebcm off last sunday and yes obce i turned the car on it gave me a messagesying service vehicle soon. I just reset it. Yesturday i recieved my ebcm back from mandigital. He fixed it for $50. I installed it and all was good just had to erase the active code stored by the previous active control test done by the pcm. Erased codes and started car back up. And all is good. No more abs and active control light or error messages on start up.
Hi I currently have the following codes and I see you sent your EBCM to mandigital and he fixed it for $50.00 I wanted to see if I could get his info from you I would love to have him fix mine. 28-TCS NO COMM. 40-BCM B0432 H C
58-SDM U1040 H C
Hi I currently have the following codes and I see you sent your EBCM to mandigital and he fixed it for $50.00 I wanted to see if I could get his info from you I would love to have him fix mine. 28-TCS NO COMM. 40-BCM B0432 H C
58-SDM U1040 H C
C, the codes related to the EBCM are generally 12xx. Not all years EBCM are repairable.
Maybe not done ???? we opted for the Surge suppression upgrade, as recommended by Brandon at ABS. Bil I figured you are very knowledgeable, but sometimes here on the forum some of you think you know more than the people who fix things for a living ??? a lot is made up over the shortcomings and availability of some parts, 99% of what I post here is "been there done that" more than a few times !!!!
Just because someone does something for a living doesn't always mean they know more about it than some of the knowledgeable people here, or anywhere else, as far as that goes! I once saw a guy grinding on a surface grinder that was clearly not doing it right. I called him on it, and tried to explain why it was the wrong way to go about it. He fired back at me, saying Man, I've been doing this **** for 20 years. At that point, I told him Then you've been doing it WRONG for 20 years!! When it comes to electronics experts, I'd say @Lionel Hutz, @C5 Diag, @Bill Curlee, @M. Martinez, @spfautsch, and others know as much, and sometimes more, than a lot of people doing it for a living. "For a living" is way too much of a blanket statement.
Last edited by grinder11; Jul 3, 2023 at 06:49 PM.
Got the thing out and got the case off. Reading the long post by nvusgt below, I was wondering after the repair, is there no procedure around to bench test the thing? R&R'ing it in and out of the car is not gonna work for me I just had surgery on my neck! This is the perfect bench project for me while Im stuck inside. I really want to make sure the relay works before putting it back. When I took the thing out it was stuck in 1214U, and gave TCS and ABS warnings. Now with the EBCM out, I get codes from PCM and SDM? Sound right? Anyway only one alarm to clear now "Service Vehicle Soon". Runs and drives fine! Car is 2001 and does not have ride control.
I wish I could help. Mechanical stuff I'm much better at than electronics stuff. I'm hoping you'll find some help on it, and share what you find out. Generally speaking, the early EBCMs, say '97-'00, aren't repairable, or should I say aren't as easily repaired, or repairable to the same degree. There are some smart people on this forum. Guys with earlier cars do have options. There's a sticky about a guy who installed an '01-up BCM, EBCM, SWPS, and TPMS in his early model. It can be done. I myself own a 2000 vert. So early EBCM repairs/questions catch my eye pretty quickly. Best of luck to you.....
Bench Test for EBCM?
This is the perfect bench project for me while Im stuck inside. I really want to make sure the relay works before putting it back. When I took the thing out it was stuck in 1214U, and gave TCS and ABS warnings. Now with the EBCM out, I get codes from PCM and SDM? Sound right? Anyway only one alarm to clear now "Service Vehicle Soon". Runs and drives fine! Car is 2001 and does not have ride control.
I mean not even a "go away kid you bother me" response?? It's interesting that when some folks post what the perts on this board consider repetitive or FAQ, they get flamed for not first doing a search and spending at least 4 days researching previous threads on the subject. So I do the research, trouble shoot my code, remove the module and then ask a basic yes/no question....and get ignored? 
It;s obvious none of the perts know how to do this, but none wants to admit it either. 
