Originally Posted by 8VETTE7

Another thing you can check is the 6 pin connector that is located in each A Pillar. Here is a link to a thread that has some pictures as well as a list of some of the symptoms that can be caused by these 2 connectors:

http://forums.corvetteforum.com/c5-t...-there-is.html

The 3rd from the last picture in post #1 shows the black 6 pin connector in question. It can be accessed by pulling back the black accordion boot at its connection point to the A Pillar and fishing out the two connectors that are hanging inside the A Pillar. The black connector contains an appearance of the serial data buss and when the connector makes poor contact due to the damaged pins it corrupts the information on the serial data buss and that can cause all sorts of crazy symptoms including the ones you listed. The contact surfaces in each half of that connector are soft and easily become malformed. Before you go into the connector to try and straighten any damaged pins you should disconnect the battery neg cable because some contacts contain battery voltage.

Another place there is an appearance of the serial data buss is the connector under the drivers seat. Often that gets damaged by a previous owner removing the drivers seat and not correctly securing the wiring upon reinstallation of the seat. The connector can then drag on the carpet as the seat is operated leading to the same type of symptoms.

One way to eliminate all 3 of these connection points at the same time as the source of the problems, is to go into the passenger foot well and find the two star connectors. Here is some info on the star connectors to help identify them:









The first pic show the two connectors next to the BCM (aluminum can in that picture). The second shows the shorting bars exposed by removing the top of the connector.

If you remove the shorting bars from the smaller of the two connectors you are effectively disconnecting the serial data buss wire from the two door control modules and the seat control module. Look at the wiring diagram to see that the small star connector services these 3 modules. With the shorting bars removed you will no longer be able to operate the electricals in the doors (windows, mirriors etc) nor be able to move the drivers seat/telescopic column but doing this allows you to see if the symptoms have gone away and you can start the car and pull codes.

If the symptoms are gone then you need to, one wire at a time, reconnect the purple wire in the half of the connector containing the wires to each of the other color wires.. After connecting one retest to see if the problems have returned. By process of elimination you will find which module is the source or the problems so you can address that.

PS I assume you meant that the engine was an LS1 and not an LT1.....

Originally Posted by 8VETTE7

P1571 Is an error related to desired torque signal from the EBCM has not been received by the PCM for 3 seconds or longer:

http://www.gearchatter.com/viewtopic8503.php


Could be because of any number of reasons.


Interesting that there were no other codes except PCM related. I have to wonder is this is because there were no others or the scanner being used does not how to deal with vehicle specific codes for your Corvette.

I would have expected several other sensors that communicate with the PCM to have complained (generated codes) if the PCM were truely dead but I don't have actual experience with a dead PCM to back up that suspicion.


If you want to disable the EBCM because yo suspect it then pull fuses 52, 53 and 5 in the underhood fuse box to see if that makes any difference in being able to pull codes via the DIC. I suspect that you don't yet have all the DTC's stored.....