no communication on DTC
Thread Starter
Heel & Toe
Joined: Oct 2012
Posts: 18
Likes: 0
no communication on DTC
My 03 sat for several months ( indoors ) and now i have a host of trouble
1) shocks inoperative
reduced engine power
low fuel
check tire pressure
service vehicle soon
service ride control
service tire monitoring system
2) every module in DTC says NO COMM
3) car starts and seem fine but driver controls will not operate passenger window, lock or mirror
4) I checked all grounds and door connections there is no corrosion
car only has 7000 miles and is garaged
PLEASE HELP
1) shocks inoperative
reduced engine power
low fuel
check tire pressure
service vehicle soon
service ride control
service tire monitoring system
2) every module in DTC says NO COMM
3) car starts and seem fine but driver controls will not operate passenger window, lock or mirror
4) I checked all grounds and door connections there is no corrosion
car only has 7000 miles and is garaged
PLEASE HELP
Melting Slicks
Joined: May 2008
Posts: 2,606
Likes: 355
From: Rochester New York
I wouldn't rule out the grounds. I have seen cars with similar conditions and it's always a ground. I would disconnect the battery, remove the grounds in the engine bay... should be three... 2 on frame just in front of the shocks and one next to he battery tray. Use a wire brush to strip the paint down to bare metal. Wire brush all terminals. Install a star washer to bite into the frame, them the terminals, then another star washer and last the nut. After all is clean and secure, spray some battery post anti-corrosion coating on the grounds.
If that doesn't solve your problem it could be a bad Star Connector or BCM.
If that doesn't solve your problem it could be a bad Star Connector or BCM.
Tech Contributor
Joined: Jan 2007
Posts: 19,273
Likes: 1,103
From: Dyer, IN
My 03 sat for several months ( indoors ) and now i have a host of trouble
1) shocks inoperative
reduced engine power
low fuel
check tire pressure
service vehicle soon
service ride control
service tire monitoring system
2) every module in DTC says NO COMM
3) car starts and seem fine but driver controls will not operate passenger window, lock or mirror
4) I checked all grounds and door connections there is no corrosion
car only has 7000 miles and is garaged
PLEASE HELP
1) shocks inoperative
reduced engine power
low fuel
check tire pressure
service vehicle soon
service ride control
service tire monitoring system
2) every module in DTC says NO COMM
3) car starts and seem fine but driver controls will not operate passenger window, lock or mirror
4) I checked all grounds and door connections there is no corrosion
car only has 7000 miles and is garaged
PLEASE HELP
I will PM you info on what to check next.
Melting Slicks
Joined: May 2008
Posts: 2,606
Likes: 355
From: Rochester New York
The key is the service shocks message... a lot of times the cars that show this don't even have selective ride.
Tech Contributor
Joined: Jan 2007
Posts: 19,273
Likes: 1,103
From: Dyer, IN
Ok, I'm not very good with this electrical stuff.
Thread Starter
Heel & Toe
Joined: Oct 2012
Posts: 18
Likes: 0
I have checked grounds and are perfect No corrosion very clean
even thought there are several threads they are not like this I have no codes just NO COMM and passenger door cannot be controled from drivers door
even thought there are several threads they are not like this I have no codes just NO COMM and passenger door cannot be controled from drivers door
Safety Car
Joined: Oct 2003
Posts: 3,699
Likes: 16
From: Sun City- Menifee Calif.
Try pulling the accordian connectors between door and body (Driver side first) Pull the wires out of the body side, there are two connectors . take them apart, clean tham, I used WD 40, plug them back together . Mine were corroded, especially the black one, Had exact same symptoms you describe.Been good for a year now! Check out Bill Curlee elec. posts. There are pics of the connectors and how you remove the accordian boots.
Melting Slicks
Joined: May 2008
Posts: 2,606
Likes: 355
From: Rochester New York
There will be no corrosion. The frame and grounds are painted. Paint reduces or eliminates conductivity. With engine vibration, I imagine the grounds, terminals, nuts, etc... can shift ever so slightly. It's possible that there is just not good contact. With the composite body panels, ground connections are even more vital than other vehicles.
Do your self a favor disconnect the battery and wire brush that ground and all the terminals to it. See if it makes a difference or not.
IF... that doesn't do the trick, disconnect the battery, then remove the BCM for one hour. The BCM will hard reset. Reinstall BCM, connect battery and see what you got.
This is all coming from a guy with YEARS of experience of working on strictly Corvettes. I am not telling you all of this for laughs.
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Thread Starter
Heel & Toe
Joined: Oct 2012
Posts: 18
Likes: 0
verified battery 100% charge and perfect on load test
all connections are perfect???
removed BCM and reinstalled after 1-2 hours
I have now cleaned grounds for a third time
NO CHANGE AT ALL
what now
any ideas
all connections are perfect???
removed BCM and reinstalled after 1-2 hours
I have now cleaned grounds for a third time
NO CHANGE AT ALL
what now
any ideas
Melting Slicks
Joined: May 2008
Posts: 2,606
Likes: 355
From: Rochester New York
Did you take a look at the grounds at the bottom of both A pillars?
What are the current DTCs? Please list them.
Have you tried removing the star connectors and reinstalling them? They are located next to the BCM in the harness.
Tech Contributor
Joined: Jan 2007
Posts: 19,273
Likes: 1,103
From: Dyer, IN
Racer
Joined: Apr 2009
Posts: 488
Likes: 2
From: Myrtle Beach SC
Ha! 
I don't know what advice lucky has given, but I would follow it...and not give much thought to what other "experts" have told you. Think about it...
Hope you get this problem solved...I know electrical issues are a headache!
I don't know what advice lucky has given, but I would follow it...and not give much thought to what other "experts" have told you. Think about it...
Hope you get this problem solved...I know electrical issues are a headache!
Melting Slicks
Joined: May 2008
Posts: 2,606
Likes: 355
From: Rochester New York
Through personal experience diagnosing and repairing Corvettes for this exact same condition, one was fixed by wire brushing and treating the grounds, another was fixed by replacing the star connector and the last was fixed by replacing the BCM.
If you knew someone with a similar car you could try their BCM and see if the codes go away. You will need to have the BCM reprogrammed if you end up replacing it for good, but for testing purposes you can just turn the key on and see if the messages go away.
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
PLAIN AND SIMPLE,,,,,,,,,,,,,,,,,,,,,,, The absolute easiest thing to do is the accordion tube check.
ITS FREE,, TAKES 1 minute...Open both doors, shake the hell out of the accordion tubes. If the COMMS return, let us know for the fix.
BC
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
I would read this thread VERY carefully :
http://forums.corvetteforum.com/c5-t...-there-is.html
Shaking the accordion tube doesn't always change/improve the symptoms.
http://forums.corvetteforum.com/c5-t...-there-is.html
Shaking the accordion tube doesn't always change/improve the symptoms.
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
Ok,,,, DO THIS. Disconnect BOTH caps. Use some jumper wire and carefully connect "JUST" the BCM. PCM and IPC toghether. See if you regain normal IPC functions.
That will eliminate all other modules from the problem.
Bill
That will eliminate all other modules from the problem.
Bill