How to reprogram BCM?
Thread Starter
Intermediate
Joined: Dec 2006
Posts: 26
Likes: 0
How to reprogram BCM?
Just replaced my BCM and currently experiencing a column lock symptom. I thought I read somewhere that you could manually reprogram the BCM so that you could drive your car down to the dealership if you needed to have it reprogrammed. Anyone have any good links or know what to do? I can't seem to find anything through my searches.
Burning Brakes
Joined: Jan 2005
Posts: 1,057
Likes: 18
From: BF Mid East TEXAS
If it is a security issue you have to relearn the key security codes...
Is this a used BCM? I have done 2 BCM replacements I will see if i can find the procedure..
I did have to take one to the dealer to remove the active handling feature that my car does not have.
Is this a used BCM? I have done 2 BCM replacements I will see if i can find the procedure..
I did have to take one to the dealer to remove the active handling feature that my car does not have.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 28
From: Van Buren Arkansas
Wounded Warrior Escort '11
You are correct that there is a manual relearn procedure which I don't have, but it is posted in here somewhere. What it does is allows the secured password that's shared between the PCM and BCM to be relearned which will do exactly what you need, allow the car to start and run to get it to a dealer with a Tech2 where the RPO codes can then be programmed into it. Use the search and you will find it....its here somewhere.
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
Is this what you need?
http://www.hptuners.com/forum/showpo...72&postcount=5
or
http://www.c5help.com/c5_no_start.htm
http://www.hptuners.com/forum/showpo...72&postcount=5
or
http://www.c5help.com/c5_no_start.htm
Last edited by dougbfresh; Aug 5, 2009 at 11:44 AM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,396
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
The ONLY way to access the BCM is with a TECH II. The only changes that can be done are installing or removing GM RPO codes to support factory or dealer installed options (ie the F-45 Real Time Dampening)
dougbfresh provided you procedures for syncing the BCM / PCM passwords.
That will get the car to run but,,,it will NOT address any RPO codes that are no longer supported. You will know if there are issues because they will either NOT FUNCTION or you will have No Comms DTCs.
If you have column lock issues, thats a security related problem or a Column Lock circuit failure.
Get the BCm issues sorted out and then work on the column lock. Is your steering wheel locked ???
The 2 mph speed restriction (fuel cut off can be addressed via the PCM using EFI Live or HP Tuners. You remove the sucreity related fuel cut off via a table.
Bill
Bill
dougbfresh provided you procedures for syncing the BCM / PCM passwords.
That will get the car to run but,,,it will NOT address any RPO codes that are no longer supported. You will know if there are issues because they will either NOT FUNCTION or you will have No Comms DTCs.
If you have column lock issues, thats a security related problem or a Column Lock circuit failure.
Get the BCm issues sorted out and then work on the column lock. Is your steering wheel locked ???
The 2 mph speed restriction (fuel cut off can be addressed via the PCM using EFI Live or HP Tuners. You remove the sucreity related fuel cut off via a table.
Bill
Bill
Race Director
Joined: May 2005
Posts: 15,960
Likes: 21
From: West Norriton PA
St. Jude Donor '08
Just replaced my BCM and currently experiencing a column lock symptom. I thought I read somewhere that you could manually reprogram the BCM so that you could drive your car down to the dealership if you needed to have it reprogrammed. Anyone have any good links or know what to do? I can't seem to find anything through my searches.
I'm in the King of Prussia area of PA.
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Race Director
Joined: May 2005
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From: West Norriton PA
St. Jude Donor '08
Thread Starter
Intermediate
Joined: Dec 2006
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So, what does everyone think is my problem? After reading the forum below, it seems that when I replaced my BCM with one from a salvaged unit, the pallet in my key is now wrong for the unit. As a result, the security system is locking me out by killing the motor if I go faster than 2 mph. So, would taking it the dealer fix this issue? Is there anyway to bypass this 2mph so I can drive to the dealership? The car runs just is stopped by the 2mph. I can't be sure, but I don't think my column is really locking on me. I'm wondering if someone did the CLB already. I'll check tonight. If not, I'm buying one tonight. Would it be the consenses that reprogramming would take care of all issues?
http://forums.corvetteforum.com/c5-t...m-running.html
http://forums.corvetteforum.com/c5-t...m-running.html
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,396
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
So, what does everyone think is my problem? After reading the forum below, it seems that when I replaced my BCM with one from a salvaged unit, the pallet in my key is now wrong for the unit. As a result, the security system is locking me out by killing the motor if I go faster than 2 mph. So, would taking it the dealer fix this issue? Is there anyway to bypass this 2mph so I can drive to the dealership? The car runs just is stopped by the 2mph. I can't be sure, but I don't think my column is really locking on me. I'm wondering if someone did the CLB already. I'll check tonight. If not, I'm buying one tonight. Would it be the consenses that reprogramming would take care of all issues?
http://forums.corvetteforum.com/c5-t...m-running.html
http://forums.corvetteforum.com/c5-t...m-running.html
BCM/PCM RELEARN PROCEDURE
You will need to conduct the PCM/BCM relearn process. This matches their handshake ID's and allows them to talk to each other.
Do this before you worry about VATS issues:
1. Turn on the key for 11 minutes.
2 Turn off the key for 30 seconds.
3. Repeat 1&2 two more times.
4. Turn on the key for 30 seconds.
The car should start and run with the new BCM. Good luck and report back on your progress.
Shirl
SD Racing Enterprises
Aguila, AZ
Coutersy of MrEracer
This will sync the PCM to the New BCM but all of your RPO options will not be retained. You will need a TECH II to program them into the new BCM.
Bill Curlee
Thread Starter
Intermediate
Joined: Dec 2006
Posts: 26
Likes: 0
Try this:
BCM/PCM RELEARN PROCEDURE
You will need to conduct the PCM/BCM relearn process. This matches their handshake ID's and allows them to talk to each other.
Do this before you worry about VATS issues:
1. Turn on the key for 11 minutes.
2 Turn off the key for 30 seconds.
3. Repeat 1&2 two more times.
4. Turn on the key for 30 seconds.
The car should start and run with the new BCM. Good luck and report back on your progress.
Shirl
SD Racing Enterprises
Aguila, AZ
Coutersy of MrEracer
This will sync the PCM to the New BCM but all of your RPO options will not be retained. You will need a TECH II to program them into the new BCM.
Bill Curlee
BCM/PCM RELEARN PROCEDURE
You will need to conduct the PCM/BCM relearn process. This matches their handshake ID's and allows them to talk to each other.
Do this before you worry about VATS issues:
1. Turn on the key for 11 minutes.
2 Turn off the key for 30 seconds.
3. Repeat 1&2 two more times.
4. Turn on the key for 30 seconds.
The car should start and run with the new BCM. Good luck and report back on your progress.
Shirl
SD Racing Enterprises
Aguila, AZ
Coutersy of MrEracer
This will sync the PCM to the New BCM but all of your RPO options will not be retained. You will need a TECH II to program them into the new BCM.
Bill Curlee
Race Director
Joined: May 2005
Posts: 15,960
Likes: 21
From: West Norriton PA
St. Jude Donor '08
Get somebody with a programmer that can change the fuel cut-off speed to 200 mph.
Thread Starter
Intermediate
Joined: Dec 2006
Posts: 26
Likes: 0
8-23-09 Update.
Car is up and running. Thanks for everyone's help. I have to especially thank Chuck (8Vette7) for walking me through fixing my issue.
Car was a 99 with the 6spd. My car's BCM got wet and I replaced it with a used one. After I relearned the PCM to the BCM, the car started but then I got the CL failure. I pulled everything apart and found that I had a K-harness installed. As part of the GM recall, this harness was installed and I believe the locking mechanism was deactivated as I could turn the steering wheel with no key. Also the 2mph fuel cut was programmed in. To fix the issue, I disconnected the K-harness, and installing the CLB. I had to get the CLB working, I had to pull fuses 25 and 29 for a minute. After that the car started right up. Thanks again guys.
Car is up and running. Thanks for everyone's help. I have to especially thank Chuck (8Vette7) for walking me through fixing my issue.
Car was a 99 with the 6spd. My car's BCM got wet and I replaced it with a used one. After I relearned the PCM to the BCM, the car started but then I got the CL failure. I pulled everything apart and found that I had a K-harness installed. As part of the GM recall, this harness was installed and I believe the locking mechanism was deactivated as I could turn the steering wheel with no key. Also the 2mph fuel cut was programmed in. To fix the issue, I disconnected the K-harness, and installing the CLB. I had to get the CLB working, I had to pull fuses 25 and 29 for a minute. After that the car started right up. Thanks again guys.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,396
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
NO! The VATS circuit isnt working. Are you sure that you connected the small VATS black jacketed wire when you replaced the switch??
You can see it in this picture. It goes to the small metal can (sensor) on the front of the key cylinder. Make sure it plugged in properly!!!
You can see it in this picture. It goes to the small metal can (sensor) on the front of the key cylinder. Make sure it plugged in properly!!!
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,396
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
If you received a NEW key,,,,,, was the pellet resistance the EXACT same value as your old key pellet???
Last edited by Bill Curlee; Jan 24, 2011 at 08:35 PM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,396
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Hmmmmmmmmmm,,, If all you did was change the lock cylinder, read the key resistance and note it. Then insert the key in the ignition, disconnect the chip reader cable and read the resistance of the key THRU the harness that comes off the sensor. It should read almost exactly the same as the key chip read.
If it does, make sure the male and female pins in the tiny connector are making the correct contact and are NOT damaged.
BC
BC
If it does, make sure the male and female pins in the tiny connector are making the correct contact and are NOT damaged.
BC
BC