bcm questions
Tech Contributor
Joined: Jan 2007
Posts: 19,401
Likes: 1,141
From: Dyer, IN
Thread Starter
Navigator
Joined: Feb 2009
Posts: 9
Likes: 0
My head lights are inop, wont flip up or down, low and high beams do not work. He said he ran a hard line to the and was able to get everything to work. Also my horn and keyless entry is inop which may or may not be part of the same issue. Thanks for the help.
Tech Contributor
Joined: Jan 2007
Posts: 19,401
Likes: 1,141
From: Dyer, IN
Sounds to me like you need to find another shop that knows the C5. Horn issues and headlight issues are common failures in these beasts and the BCM is NOT likely to be related to them. Same for the keyless entry system especially in the earlier C5 vehicles.
I'd check the fuse on the horn as it probably has been pulled by a previous owner. (Fuse 11 in the engine compartment fuse box.) Bet if you replace it it will sound continuously. If it does, here's a link to a repair procedure:
http://forums.corvetteforum.com/show....php?t=1739923
Keyless entry is likely to be bad remotes. Do a search as there are procedures to try and repair the remotes but most likely you will need to replace the remotes.
Headlights gets a little more involved. Could be the multifunction stalk, fuses, relays or even the motors. Could also be grounds that need to be repaired.
NOT likely that the BCM is bad for any of the problems you list.
I'd check the fuse on the horn as it probably has been pulled by a previous owner. (Fuse 11 in the engine compartment fuse box.) Bet if you replace it it will sound continuously. If it does, here's a link to a repair procedure:
http://forums.corvetteforum.com/show....php?t=1739923
Keyless entry is likely to be bad remotes. Do a search as there are procedures to try and repair the remotes but most likely you will need to replace the remotes.
Headlights gets a little more involved. Could be the multifunction stalk, fuses, relays or even the motors. Could also be grounds that need to be repaired.
NOT likely that the BCM is bad for any of the problems you list.
The multifunction switch sends 12 volts directly to the headlamp door control module, so you should be able to turn them on manually, even if the BCM does not allow the twilight feature to work.
Drifting
Joined: Nov 1999
Posts: 1,502
Likes: 12
From: Yorktown Heights NY
Have you checked for codes in the DIC?
Turn ignition to On...just before start.
Press reset to clear any error codes.
Hold down Options key and press Fuel key four times to start reading the codes.
The DIC will say Diagnostics.
Write down what you see and post please.
Turn ignition to On...just before start.
Press reset to clear any error codes.
Hold down Options key and press Fuel key four times to start reading the codes.
The DIC will say Diagnostics.
Write down what you see and post please.
Last edited by 95BLKVette; May 4, 2009 at 07:38 PM.
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
READING YOUR Engine Diagnostic Codes (DTCs)
The Diagnostic Display Mode is entered with the following procedure:
1) Turn on the ignition but don't start the engine.
2) Press the RESET button to turn off any warning messages. (i.e. door open, trunk open etc…)
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 code indicates a malfunction is present 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 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 RESET
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.
Here is very good site of DTC definitions:
http://www.gearchatter.com
Make sure to include the H or C suffix!!
The Diagnostic Display Mode is entered with the following procedure:
1) Turn on the ignition but don't start the engine.
2) Press the RESET button to turn off any warning messages. (i.e. door open, trunk open etc…)
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 code indicates a malfunction is present 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 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 RESET
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.
Here is very good site of DTC definitions:
http://www.gearchatter.com
Make sure to include the H or C suffix!!
Thread Starter
Navigator
Joined: Feb 2009
Posts: 9
Likes: 0
Have you checked for codes in the DIC?
Turn ignition to On...just before start.
Press reset to clear any error codes.
Hold down Options key and press Fuel key four times to start reading the codes.
The DIC will say Diagnostics.
Write down what you see and post please.
Turn ignition to On...just before start.
Press reset to clear any error codes.
Hold down Options key and press Fuel key four times to start reading the codes.
The DIC will say Diagnostics.
Write down what you see and post please.
P1433H
BCM
B0508H
B2482H
B2592H
HVAC
U1160
Also here are a bunch of random codes.
AO-LDCM
B2284
B2252
B2282
U1064
1-RDCM
B2283
B2285
B0-RFA
U1096
U1016
C2100
C2105
C2110
C2115
I think my vette is going to explode.
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