Be sure to let us know the outcome!
1999 BCM? ECM? Problems
Thread Starter
Cruising
Joined: Jul 2010
Posts: 11
Likes: 0
1999 BCM? ECM? Problems
Just got a 1999 and having some problems. Headlights coming on/off on their own. A/C cold then warm (compressor stays running) was told it was damper control in the dash? Traction control light comes on/off at times. Could all of this be related to a computer problem?? Any help would be appreciated, Thanks.
Instructor
Joined: May 2010
Posts: 117
Likes: 2
From: Providence RI
Just got a 1999 and having some problems. Headlights coming on/off on their own. A/C cold then warm (compressor stays running) was told it was damper control in the dash? Traction control light comes on/off at times. Could all of this be related to a computer problem?? Any help would be appreciated, Thanks.
1) Turn on the ignition but don't start the engine.
2) Press the RESET button to turn off any warning messages
3) Press and hold OPTIONS
4) While holding OPTIONS, press FUEL four times within a 10-second period.
You can then scroll through all the computers and pull the codes. There are a list of codes and their meanings all over this forum.
I would start there. A quick check to see if you have a probable BCM problem is to pull the passenger foot/toe panel inside the car. If water has entered the cabin via an overflow from the cowl in the HVAC because of clogged drain utters or a clogged A/C drain tube, then this may be one of your problems.
Bad/corroded grounds would cause these problems also. Again, on the forum 'search' is your best option. There are posts describing all of the C5 ground locations. I cleaned all of mine and was able to get rid of a 'H' TCS code.
Last edited by FirethornC5; Jul 11, 2010 at 09:33 AM.
Thread Starter
Cruising
Joined: Jul 2010
Posts: 11
Likes: 0
About 25 codes were hanging. Took it to local shop and they suggest replacing the ECM. I saw a guy on EBAY who can program a used one with my VIN # for $100. I'm going to give it a try. Thanks for your help!
Drifting
Joined: Feb 2008
Posts: 1,596
Likes: 67
From: Bahama North Carolina
You are about to waste your $100. Clear all the codes and see what comes back after a short drive. You have some issues to work out but replaceing the ECM is not where to start.
Thread Starter
Cruising
Joined: Jul 2010
Posts: 11
Likes: 0
I cleared all the codes and took a short drive. Here are the codes that came back up, p1571 hc, u1096h, u1064h, u1016h, and c1277h. Problems I still have are L headling will not go down and R won't go up. Wipers intermittent, oil psi gage pegged out. HVAC not blowing cold air-AC is running, louver problem? And trac control light won't stay out.
Thread Starter
Cruising
Joined: Jul 2010
Posts: 11
Likes: 0
I found the AC vent problem. It was the broken airline under the battery. Thanks to all the "smart guys" on this forum. Still working on the other issues. Headlights won't open, wipers won't work and oil psi gage pegs out when started. Please help...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
Instructor
Joined: May 2010
Posts: 117
Likes: 2
From: Providence RI
Oil sender is junk. Search forum for tutorial fix. Wipers not working could be clogged udders in cowl. Search for waterleaks and you will be able to locate driver and passenger udders. Wiper is possibly shorted from water not being able to drain through clogged udders. Use search for headlamp problem. Did you pull the passenger toe board and check for corrosion on bcm? Did you check for corroded grounds? Again, use search to find the ground locations.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
Look for water contamination on or in the BCM. If found, you need to clean out the udders for the HVAC. You will then need to disconnect the battery, using a grounding write strap, take apart the BCM and clean it with iso alcohol. If things still don't work after that, pull the codes again and post but it could be that the BCM is done. The headlamps might only be the headlamp switch itself as they have a high failure rate. The oil pressure sender is done. You'll need to remove the intake in order to get to it but its a fast easy job. I suggest that you locate a brass oil pressure sending unit to replace it with rather than an alluminum one. I don't know about the wipers, so I can't give you advice there other than check the fuses, all fuses, first.
Instructor
Joined: May 2010
Posts: 117
Likes: 2
From: Providence RI
I purchased a Borgwarner. Its brass and made is USA!
Thread Starter
Cruising
Joined: Jul 2010
Posts: 11
Likes: 0
BCM area was dry and clean. I also checked the body grounds under the hood, clean firm connections. Couldn't find the other ones, I guess I need to get it on a lift? The fuse was removed from the wipers-replaced fuse-but now they will not shut off? The headlight motors can be run up/down with a jumper but won't move with the switch, the headlights are lighting up when turned on?
Last edited by crabmaster; Jul 27, 2010 at 03:33 PM.
Instructor
Joined: May 2010
Posts: 117
Likes: 2
From: Providence RI
BCM area was dry and clean. I also checked the body grounds under the hood, clean firm connections. Couldn't find the other ones, I guess I need to get it on a lift? The fuse was removed from the wipers-replaced fuse-but now they will not shut off? The headlight motors can be run up/down with a jumper but won't move with the switch, the headlights are lighting up when turned on?
Thread Starter
Cruising
Joined: Jul 2010
Posts: 11
Likes: 0
Thanks for all the help, everything is fixed! Had to replace the wiper motor. The headlight door control module was bad (under the RF headlamp). And the vacuum line was broke underneath the battery tray causing the interior louvers not to operate.
