Having issues with my 2003 corvette Convertible, six speed manual. Car is orginal, no modifications at all. First of all the battery will drain sometimes after a few days. Every time i start the car all the gauges except the voltage will not work. I get all the warning lights on the dash come on, the reduce engine speed, traction control, low air pressure warning messages appear, the radio cuts off the windows wont work the ac compressor shuts off. This will continue until you drive the car for a while or stop and restart several times. Appears to be worse when there is moisture in the air. I took it to a local dealer who specializes in Corvettes and was told it was the BCM which they did replace and the issue is still happening. After taking it back in and them keeping the car for several months and not finding anything i decided to give up on the dealer. I have checked all the common things such as ground connections under the hood, all are clean and no corrosion, new battery. Checked the wiring harnesses in the doors, shook them and no change in lights going off. Once i reset the codes and crank it, same thing happens again. These are the codes I'm getting once i check it.
10-PCM P1626 H
28-TCS U1301 H
40-BCM U1255 H
40-BCM U1016 H
40-BCM U1096 H
58-SDM U1301 H
60-IPC U1255 H
60-IPC U1016 H
60-IPC U1064 H
60-IPC U1040 H
60-IPC U1176 H
60-IPC U1088 H
80-RADIO U1064 H
80-RADIO U1096 H
80-RADIO U1016 H
99-HVAC U1064 H
99-HVAC U1096 H
99-HVAC U1160 H
99-HVAC U1255 H
AO-LDCM U1064 H
AO-LDCM U1016 H
A1-RDCM U1255 H
A1-RDCM U1064 H
A1-RDCM U1016 H
A1-RDCM U1096 H
A6-SCM U1300 H
BO-RFA U1255 H

Any suggestions would greatly be appreciated.
Thanks
Mike

 

8VETTE7 is correct. Review the link he provided. Obviously the dealer does not know how to work on newer model Corvettes.

The serial bus is over the head of many people but it can be easily explained. You are welcome to PM me with your phone number and I can explain it to you and how to find out what is causing your problem.

Where are you located?

 

followed the steps, nothing changed doing the same things...

 

Talk to Dadaroo, he will help get it straightened out. Then get your $$ back for the Bcm you didn't need.

 

I didn't clear the codes before removing. The floor is not wet and never has been to my knowledge, no signs of water stains or any sort of corrosion. I will clear the codes and remove cap again and post any new codes that come up.

Thanks

 

UPDATE: After clearing all the codes, disconnected the battery and and began checking the star connector, started with the four wire first. Using a ohms meter and made sure i had a good ground, the first wire i checked was the purple, immediatley got a bad reading that is was going to ground but this only lasted for about 5 seconds and everthing was good. All the other wire on both star connectors checked out fine. So i put the caps back on re connected the battery and everything worked fine, no lights no codes.. This lasted a day then the random messages and dash lights acted up again. So i checked the codes and they were all the same as the ones listed in my orginal thread. So again cleared them and disconnnected the battery and checked the the star connector with my meter, and bam got the same bad reading on the purple wire for about 5 seconds and it was gone. all the other wires checked out fine. Hooked everything back up and everything is working fine, pretty sure in the next day it'll act up again.

 

Will call you later. Did not know about the initial ground indication. For the moment, assuming the BCM is not at fault and the Purple wire is being grounded, then the ground point will be easy to find. Need to know if both Star connector "bus tie" bars were in or not when you saw the ground. May need to have some of the serial bus Star connector pins pulled to track it down.

Update, talked to Mike and he said when he saw the ground indication it was when he had the bus tie removed from both Star connectors. That would indicate the ground is somewhere in the purple wire and most likely somewhere behind the center console where some sharp edges are. Recommended he remove the purple wire pin from Star connector 1. That would just remove the serial bus for the doors and seat module. If correct, the throwing of communication codes will go away.

If this is the case, I will work with him to correct the issue.

 

Update: After removing the purple wire from the the Star connection, I first removed it from the 4 wire connector and then 10 wire connector.Both made things worse, car started threw all the sames codes and then dies after several seconds.

 

For the most part,,, 90% of the time you have all the weird issues you had, it's due to a POOR CONNECTION in the LDCM, RDCM or the SEAT CONTROL MODULE (SCM) power connectors.

It can also be caused by a WET/DAMP BCM.. If the HVAC Air Box condensate drain gets clogged, the water in the air box will build up and overflow into the passengers foot well (ON TO THE BCM) The BCM does NOT like to be wet!!!!!

Pop out the accordion tubes between the doors and door frames. Disconnect the connectors. Remove the rubber tube. Examine the FEMALE PINS in the six wire power connector. If ANY of the female pins have crushed/deformed female pin toungs (things that grip the male pins) you will need to bend then back up so that they make positive connection with the male pins.

Just had this happen to my car. Driving down the road, car goes into REDUCED POWER, windows stop working, weird IPC operation.

As I was driving, I reached over, opened and shut the passengers door, switched Ignition Switch off and back on and resumed normal driving.

Been there done that too many times not to know what was wrong.

So, last night I did the femal pin adjustment procedure above. Had THREE bad pins in the passengers connector and two bad pins in the drivers connector. Bent the toungs back in place and its good to go.

FIXED!!!!


Bill

 

If this were the problem wouldn't removing the star connector take these out of the circuit?

 

ABSOLUTY!!! Thats the quick check. You will get NO COMMS for all three modules with it removed but, the rest of the serial data buss will return to normal.

 

I spoke to him. We initially thought he had a serial bus grounding issue on the Purple wire somewhere. With that wire/circuit removed, he is still having issues, except they have gotten worse.

I am having him pull the main Star connector bus tie connector and look for a ground on each wire. If the shows nothing since the issue comes and goes, I am having him pull one pin at a time and see if any correct the issue. He knows he needs at least to have the PCM and the BCM connected for the car to run.

 

what did you find out about to be the problem im having the same issue

 

You are replying to a TEN YEAR OLD POST. Recommend starting your own new post. You will have much better response from new forum members.

If you have a TON of old codes, PLEASE clear all of them and see what comes back. If you have a low or bad battery, you must resolve that first!

Bill