BLOWNBLUEZ06

I did a search on this and came up with some results but it wasn't as easy to find as I would've liked, so I wanted to post up with the key words in the title so that others can find it more easily.

Bill Curlee posted up the procedure in the thread that I found, but I would also like to provide more detail to hopefully make it easier on members trying this in the future.

Credit to Bill for this part:

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.

My comments:
Pull your DTC's and you should see a P1631
To further support that you need to program the BCM, the security light will flash 3 times and then remain steady and not go off.
When the BCM is programmed, the security light goes off within seconds on turning the key on. If it remains on, do the following:

Turn key on for 11 minutes. At close to that time, the security light will go off. When it does......
Turn key off for 30 seconds
Turn the key back on. Security light comes back on. Stays on for ~10-11 minutes and when it goes off, turn the key off for another 30 seconds.
Turn the key back on and watch the security light. If the security light goes off within a few seconds, you’re done.

If you retrieve your DTC's afterward, You should see a P1630H. That means the BCM entered learn mode and the H means it's a history code and no longer in learn mode.

Hoping some of you find this helpful.

elevator man 45

I will try that procedure now but still have old bcm do not have a replacement should I try with old one ? thanks

Bill Curlee

PLEASE read and post your DTCs.. That will provide us with the required info to lead guide and direct you to solve your issues.

Make sure that you use the internal C5 Code reading ability:

READING YOUR Engine Diagnostic Codes



The Diagnostic Display Mode is entered with the following procedure:

1) Turn on the ignition but don't start the engine.
NOTE! You can read the DTCs with the engine running and or driving down the road but it can distract you. BE careful! Some DTCs clear themselves when you turn the ignition OFF!
I always read my DTCs prior to turning OFF the ignition switch. If you have any messages on the DIC,, PRESS RESET until they are gone!

2) Press the RESET button to turn off any warning messages. (i.e. door open, trunk open ect.)
3) Press and hold OPTIONS
4) While holding OPTIONS, press FUEL four times within a 10-second period.


Initially, on-board diagnostics go into an Automatic Mode which shows diagnostic codes in a pre-set sequence: PCM - TCS - RTD - BCM - IPC - RADIO - HVAC - LDCM - RDCM - SCM - RFA. All codes will be displayed for each. ( i.e. PCM = 4 codes) If none are present in a given module, you will see No More Codes on the display.
There are two kinds of diagnostic codes, Current and History designated with a letter suffix, "C" or "H". A current C code indicates a malfunction is present and active in the module displaying data. A history code indicates a problem existed sometime in the last 40 or 50 ignition cycles. When not accompanied by a current code of the same number, it's potential evidence of a previous problem, now resolved, that was not removed by clearing the codes.
More likely it's an indication of an intermittent malfunction.
Intermittent codes are the most challenging of the diagnostics. An intermittent code may have happened once, may have happened more than once but is inconsistent or may be happening on a regular basis but not at the time the codes are displayed. History codes can also be caused by a current malfunction in a system that is not operating at the time codes are displayed. An example is the rear window defogger which doesn't operate until the Body Control Module detects engine rpm. For history codes set by a module that does not operate with the key on and engine off, a special diagnostic tool called a Scan Tester is necessary to properly diagnose the malfunction.
Once the system has displayed all modules, it goes into the manual mode which allows selection of each module using combinations of Driver Information Center buttons. Manual mode can also be entered during the automatic sequence by pressing any button except English/Metric (E/M). Once the display shows Manual Diagnostics, select a module by pressing the OPTIONS button to go forward or the TRIP button to go back. Once a module is selected, a code is displayed, and if more than one are present; press GAGES to go forward or FUEL to go back.
To exit the diagnostic mode at any time, press E/M. If you want to erase codes in a given module, press and hold the RESET button To reset the codes once in manual mode, press and hold RESET until it displays NO CODES Press OPTIONS to go to the next module. Repeat the steps until you have reset the codes in all the computer modules.
NOTE!! Only reset the codes IF you want to - it is NOT necessary to do this. Clearing a code does not repair a problem. You are simply erasing the evidence of it in the module's memory. If you clear the code/s, and extinguish the Check Engine Light, your emissions status ready will NOT allow you to pass an emissions test until you have completed the required driving cycles.
Once you have the codes, the next question is: What to do with the information?
First, consult the factory service manual. Any serious C5 Do-It-Yourself owner should invest in the Corvette Service Manual of the appropriate model year. The Service Manual is really a requirement if you want to understand and work on your C5. You can GOOGLE the DTC and also find information on it.




Here is very good site that explains the DTCs:


http://www.corvette-web-central.com/C5DTCcode.html


http://www.obd-codes.com/trouble_cod...d-ii-codes.php



Make sure to include the H or C suffix!!

Bill Curlee

:will y:

Good LUCK!

New BCM is most likely in order as well as some OTHER parts..

elevator man 45

Thanks for the info, so far I,ve put about 1000 miles on car with used bcm, so far so good home every time. Only issue is telescope wheel works from driver seat control and quite often pull key wait 10, other than that alls well. Local dealer will not flash used bcm say buy new we we will flash that hmm funny aint they,thanks Jason.

NSFW

Thanks for posting this. I just switched PCMs and wouldn't have been able to do it without this thread.