BCM Board damage 1997?
Thread Starter
Racer
Joined: Feb 2008
Posts: 364
Likes: 1
From: PA
BCM Board damage 1997?
Hello, after pulling some codes, it appears that there is an issue with the BCM. I cleaned all the grounds, brand new battery, cleaned all the connectors, and still, I am having issues. I pulled the BCM apart and this is what I found.
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From the picture, you can see that there is damage where the screw from the outside would go into the board...ie "they missed the hole" This leds me to believe that this has been messed with before..probably not a good sign. Do any of you think this would cause a problem??
Send question, I considered replacing the bcm but I have read that part numbers need to match exactly and it needs to be programmed. Any guidance on that issue would be appreciated.
[IMG]
[/IMG]
[IMG]
[/IMG]From the picture, you can see that there is damage where the screw from the outside would go into the board...ie "they missed the hole" This leds me to believe that this has been messed with before..probably not a good sign. Do any of you think this would cause a problem??
Send question, I considered replacing the bcm but I have read that part numbers need to match exactly and it needs to be programmed. Any guidance on that issue would be appreciated.
[IMG]
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Thread Starter
Racer
Joined: Feb 2008
Posts: 364
Likes: 1
From: PA
Here is another issue, this piece is all gooped up around the base. Is this normal???
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Also, this car has sat for almost a year, the old battery was dead, even leaking...would it benefit me to try to relink my current bcm & pcm or do they not unhandshake from each other once connected?
Thats a good tip vette, thanks...
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[/IMG]Also, this car has sat for almost a year, the old battery was dead, even leaking...would it benefit me to try to relink my current bcm & pcm or do they not unhandshake from each other once connected?
Thats a good tip vette, thanks...
Thread Starter
Racer
Joined: Feb 2008
Posts: 364
Likes: 1
From: PA
Hey Vette, here are the codes, P1571 and P1644. The car runs but the abs/tc lights are on the dash and the service ride control and service vehicle words keep coming on. The car will run but it acts as if those controls are completely dead. I did some research and I found that the PCM was replaced at a dealership in 2008 with a refurbished one. There is no mention of linking them up together and these guys charged for zipties. I do not have a "tech II" but the car does have the f45 suspension. i have cheched all of the grounds, all of the plugs with the exception of the pcm itself. the batter did leak but it wasnt horrible. i was able to clean that up but i want to put it on the lift this weekend to overhaul the transmission and ill pull the front wheel to take a look at the pcm.. now do you think i could put a matching bcm and pcm from a solid running car into mine and that would work??
thanks
Spence
thanks
Spence
Last edited by seegeer; Jun 13, 2012 at 07:51 PM. Reason: error
Tech Contributor
Joined: Jan 2007
Posts: 19,241
Likes: 1,091
From: Dyer, IN
Hey Vette, here are the codes, P1571 and P1644. The car runs but the abs/tc lights are on the dash and the service ride control and service vehicle words keep coming on. The car will run but it acts as if those controls are completely dead. I did some research and I found that the PCM was replaced at a dealership in 2008 with a refurbished one. There is no mention of linking them up together and these guys charged for zipties. I do not have a "tech II" but the car does have the f45 suspension. i have cheched all of the grounds, all of the plugs with the exception of the pcm itself. the batter did leak but it wasnt horrible. i was able to clean that up but i want to put it on the lift this weekend to overhaul the transmission and ill pull the front wheel to take a look at the pcm.. now do you think i could put a matching bcm and pcm from a solid running car into mine and that would work??
thanks
Spence
thanks
Spence
Thread Starter
Racer
Joined: Feb 2008
Posts: 364
Likes: 1
From: PA
honestly, thats what the dealership told me was the problem. I just bought the complete 4 book dealer shop manuals today so I am going to jump into but basically they told me the bcm is not responding with the pcm and thats why its not working. any ideas on where to look please help. i had the abs/tc module apart in the back and it looked good, cleaned all the plugs etc. maybe with the book i can research it out some more.
Tech Contributor
Joined: Jan 2007
Posts: 19,241
Likes: 1,091
From: Dyer, IN
honestly, thats what the dealership told me was the problem. I just bought the complete 4 book dealer shop manuals today so I am going to jump into but basically they told me the bcm is not responding with the pcm and thats why its not working. any ideas on where to look please help. i had the abs/tc module apart in the back and it looked good, cleaned all the plugs etc. maybe with the book i can research it out some more.
Thread Starter
Racer
Joined: Feb 2008
Posts: 364
Likes: 1
From: PA
Sure Lucky,
Problems: ABS/TC lights are on. I press the buttons, nothing happens.
Service Ride Control warning is on. I have cleaned all of the sensors but still nothing.
AC looks and works ok. the ac light blinks but we started to charge it and the can leaked but overall it blew cold air for awhile so I think it might be ok.
I have a loud hum/buzz noise coming from behind the driver seat.
The transmission is not shifting well into 3rd gear. when coasting, it just revs up until it feels like a shift selinoid kicks in and then it goes into gear.
Battery has leaked and the car sat with a dead battery for almost a year.
PCM was replaced in 2008 with no appearent relinking being done.
BCM board appears to be damaged slightly
I removed the abs/tc module and cleaned it. looks great could not see any obvious issues there.
I will get the codes tonight but the two i listed were in the history that the shop pulled. now i have the new shop manuals, ill run that myself to see what i get.
I really appreciate your help guys, this is very frustrating, no heartbreaking is a better word!
Spence
Problems: ABS/TC lights are on. I press the buttons, nothing happens.
Service Ride Control warning is on. I have cleaned all of the sensors but still nothing.
AC looks and works ok. the ac light blinks but we started to charge it and the can leaked but overall it blew cold air for awhile so I think it might be ok.
I have a loud hum/buzz noise coming from behind the driver seat.
The transmission is not shifting well into 3rd gear. when coasting, it just revs up until it feels like a shift selinoid kicks in and then it goes into gear.
Battery has leaked and the car sat with a dead battery for almost a year.
PCM was replaced in 2008 with no appearent relinking being done.
BCM board appears to be damaged slightly
I removed the abs/tc module and cleaned it. looks great could not see any obvious issues there.
I will get the codes tonight but the two i listed were in the history that the shop pulled. now i have the new shop manuals, ill run that myself to see what i get.
I really appreciate your help guys, this is very frustrating, no heartbreaking is a better word!
Spence
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Thread Starter
Racer
Joined: Feb 2008
Posts: 364
Likes: 1
From: PA
Codes
Well here is what I found out once I got the car back to look at the codes...
10 PCM P1571 ASR DESIRED TORQUE
P1644 DELVERED TORQUE OUTPUT CIRCUIT
Note: the PCM was replaced in 2008 and now my auto transmission is slipping in 3rd and OD?? Possible connection??
28 TCS NO COMM
Note:both the ABS/TC lights are on..I believe there is a reason for this as you will see later.
38 RTD C1780 LOSS OF STEERING POSITION SIGNAL
40 BCM BO844 BCM TEMPORARILY INHIBIT ABS
B0-RFA C211 RIGHT REAR TPM SENSOR MALFUNCTION
Note: This wheel was replaced in 2008 after the wreck.
Earlier when I was driving it, all four of the tires were reading high pressure, but then only the left front and right rear were reading that. I am wondering if that plug was damaged in the crash, not replaced, thus throwing off the BCM who shut down the abs/tc and the f45 suspension. Then because all of that is bad, the car is in like that limp mode and that is why it wont go in 3rd and od causing the transmission to feel like its slipping.
Your thoughts??
thanks
10 PCM P1571 ASR DESIRED TORQUE
P1644 DELVERED TORQUE OUTPUT CIRCUIT
Note: the PCM was replaced in 2008 and now my auto transmission is slipping in 3rd and OD?? Possible connection??
28 TCS NO COMM
Note:both the ABS/TC lights are on..I believe there is a reason for this as you will see later.
38 RTD C1780 LOSS OF STEERING POSITION SIGNAL
40 BCM BO844 BCM TEMPORARILY INHIBIT ABS
B0-RFA C211 RIGHT REAR TPM SENSOR MALFUNCTION
Note: This wheel was replaced in 2008 after the wreck.
Earlier when I was driving it, all four of the tires were reading high pressure, but then only the left front and right rear were reading that. I am wondering if that plug was damaged in the crash, not replaced, thus throwing off the BCM who shut down the abs/tc and the f45 suspension. Then because all of that is bad, the car is in like that limp mode and that is why it wont go in 3rd and od causing the transmission to feel like its slipping.
Your thoughts??
thanks
Tech Contributor
Joined: Jan 2007
Posts: 19,241
Likes: 1,091
From: Dyer, IN
Well here is what I found out once I got the car back to look at the codes...
10 PCM P1571 ASR DESIRED TORQUE
P1644 DELVERED TORQUE OUTPUT CIRCUIT
Note: the PCM was replaced in 2008 and now my auto transmission is slipping in 3rd and OD?? Possible connection??
28 TCS NO COMM
Note:both the ABS/TC lights are on..I believe there is a reason for this as you will see later.
38 RTD C1780 LOSS OF STEERING POSITION SIGNAL
40 BCM BO844 BCM TEMPORARILY INHIBIT ABS
B0-RFA C211 RIGHT REAR TPM SENSOR MALFUNCTION
Note: This wheel was replaced in 2008 after the wreck.
Earlier when I was driving it, all four of the tires were reading high pressure, but then only the left front and right rear were reading that. I am wondering if that plug was damaged in the crash, not replaced, thus throwing off the BCM who shut down the abs/tc and the f45 suspension. Then because all of that is bad, the car is in like that limp mode and that is why it wont go in 3rd and od causing the transmission to feel like its slipping.
Your thoughts??
thanks
10 PCM P1571 ASR DESIRED TORQUE
P1644 DELVERED TORQUE OUTPUT CIRCUIT
Note: the PCM was replaced in 2008 and now my auto transmission is slipping in 3rd and OD?? Possible connection??
28 TCS NO COMM
Note:both the ABS/TC lights are on..I believe there is a reason for this as you will see later.
38 RTD C1780 LOSS OF STEERING POSITION SIGNAL
40 BCM BO844 BCM TEMPORARILY INHIBIT ABS
B0-RFA C211 RIGHT REAR TPM SENSOR MALFUNCTION
Note: This wheel was replaced in 2008 after the wreck.
Earlier when I was driving it, all four of the tires were reading high pressure, but then only the left front and right rear were reading that. I am wondering if that plug was damaged in the crash, not replaced, thus throwing off the BCM who shut down the abs/tc and the f45 suspension. Then because all of that is bad, the car is in like that limp mode and that is why it wont go in 3rd and od causing the transmission to feel like its slipping.
Your thoughts??
thanks
Thread Starter
Racer
Joined: Feb 2008
Posts: 364
Likes: 1
From: PA
Why do you say ignition switch and when the guy tried to hook up an aftermarket radio, he said the wipers would come on. He unhooked it prior to me getting it. The joys of buying used lol...can you give me a little more guidance, thanks
Tech Contributor
Joined: Jan 2007
Posts: 19,241
Likes: 1,091
From: Dyer, IN
Thread Starter
Racer
Joined: Feb 2008
Posts: 364
Likes: 1
From: PA
thanks for the tip, cleaned the switch, although it was really dirty and needed the cleaning, nothing seemed to changed. I tried clearing the codes but that didnt help. Should I look at the right rear wheel sensor?
Thread Starter
Racer
Joined: Feb 2008
Posts: 364
Likes: 1
From: PA
Still, No Comm for the TCS.The Code is for the right rear tpm sensor malfunction so if i said something for a speed sensor that must be an error on my part sorry. Is there a way to just unhook all of this stuff so the car will run right?
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
You need to check all the fuses and grounds for the EBTCM. If it doesnt have power, you will get NO COMMS. There could be other issues causing the NO COMMS but,,,,,,,,,,,,, start with the easy stuff first.
Dont just look at the fuses. Actually MEASURE the two test slots on top of the fuses to GROUND and make sure that your getting actual battery voltage to the module. There are more than one fuse.
Measure the GROUND on the BPMV Motor to ground and make sure it has a good ground reading:
Actually check G-401 & 402 in the rear wheel well on the side of the frame. Your car and the 98 are the ONLY ONES to actually utilize G-402
BC
Dont just look at the fuses. Actually MEASURE the two test slots on top of the fuses to GROUND and make sure that your getting actual battery voltage to the module. There are more than one fuse.
Measure the GROUND on the BPMV Motor to ground and make sure it has a good ground reading:
Actually check G-401 & 402 in the rear wheel well on the side of the frame. Your car and the 98 are the ONLY ONES to actually utilize G-402
BC
Last edited by Bill Curlee; Jun 15, 2012 at 11:36 AM.
Thread Starter
Racer
Joined: Feb 2008
Posts: 364
Likes: 1
From: PA
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I spent the better part of the morning taking BC's advice and tracking down grounds. I have had little luck. Everything appears to be good with the exception of the cpu was covered in battery acid. I cleaned it and peices of the wire shielding came crumbling out of the plugs. We will see if this helps..
To date, I have done the following steps
1. new optima battery
2. checked and cleaned all the grounds.
3. taken the EBTCM apart, cleaned reinstalled
4. ignition switch taken apart and cleaned.
5 suspension plugs taken apart and cleaned
6 wheel sensor taken apart and cleaned.
7 BCM removed and plugs cleaned
8 checked all of the fuses inside and under the hood
9. cleaned the pcm plugs
10 fixed the ebrake handle was not engaging.
I am running out of time and ideas.
Any thoughts?
thanks
[/IMG][IMG]
[/IMG][IMG]
[/IMG]I spent the better part of the morning taking BC's advice and tracking down grounds. I have had little luck. Everything appears to be good with the exception of the cpu was covered in battery acid. I cleaned it and peices of the wire shielding came crumbling out of the plugs. We will see if this helps..
To date, I have done the following steps
1. new optima battery
2. checked and cleaned all the grounds.
3. taken the EBTCM apart, cleaned reinstalled
4. ignition switch taken apart and cleaned.
5 suspension plugs taken apart and cleaned
6 wheel sensor taken apart and cleaned.
7 BCM removed and plugs cleaned
8 checked all of the fuses inside and under the hood
9. cleaned the pcm plugs
10 fixed the ebrake handle was not engaging.
I am running out of time and ideas.
Any thoughts?
thanks
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
That connector is TOAST! If your lucky enough to get it back on without damaging any pins, its most likely going to give you issues in the future.
You may want to look into finding a good used one and splicing it on to your harness. If you do,, make sure that you solder the connections and use heat shrink with the sealer inside.
BC
You may want to look into finding a good used one and splicing it on to your harness. If you do,, make sure that you solder the connections and use heat shrink with the sealer inside.
BC
Thread Starter
Racer
Joined: Feb 2008
Posts: 364
Likes: 1
From: PA
I was able to get part of the shield back on. it plugged in ok but your probably right on needing replaced. Let me ask you this scenario, if i replace the pcm and the bcm and harness from another 97, how do i get it reprogrammed or would i even have too? Another question, that harness that runs from the plugs to the pcm, does it just run up to the big round plugs beside the battery?
thanks Bill
spence
thanks Bill
spence