Hello everyone.

My 99 corvette showing all warning lights and going crazy for a while. During that period,, i had an issue with my left door control,, all left side window, lock & unlock ,, seat memory etc didn't work. I read over the forum and found out that could be caused by the switch ignition. I followed the steps on how to clean the ignition and meanwhile i have disconnected the left side door control module.

I have cleaned the ignition and put it back into the car, and I left the door control module unplugged.
the car starts and run perfectly for 3 months now. No crazy warning lights what so ever.

Last week I decided to reconnect the door control module and the same issue is back. Warning light,, reduced engine power. etc.

I checked the forum and found out that I can diagnosis the issue by disconnecting the STAR Connector#2 which connects the LDCM, RDCM and Seat Control Modules
After disconnecting the STAR. Everything is back to normal. Now,,, what's next???
how can I know what exactly is causing the issue.
I went an. Reconnected the STAR connector to start narrowing my options. I disconnected both seats connectors, booth doors harness connectors (between the rubber tube) on at a time, and still cant find the caus of it. I then went and disconnected all 4 harness connectors ( left seat, right seat, left door harness, right door harness) and still have the issue.

So my question is. Is in it that if I disconnected all 4 harnesses connected to the STAR connector#2 act the same as disconnecting the STAR from the source. So why when disconnecting the STAR connector#2 things get back to normal. But when I plug back the STAR connector#2 then disconnect the harnesses the issue remains.

Wish you can help me out.
Thanks all in advance....

 

I doubt any of the star connectors are causing any of these issues

You should inspect wires and connector plug shown in photoes below.
If one or more of the connectors in these plugs are loose it cause many problems and disturb the serial communication .
Open these plugs and bend carefully those "pins" to achive good contact on each plug"pin".
Also try to wiggle the wires shown in order to try to identify wires partly broken due to many years of opening/cloasing of the door .
If a wire is bend back and forth to many times it can be broken in to two parts



This is how a normal serial bus signal looks like on oscillicope .
If a doormodule /seat module having problem with proper supply voltage or ground connection it could case the module to malffunction.
Please check these connections

 

PM sent !!

 

both door plugs are already disconnected. I will go over the wire see if any is broken. I will also double check all connections and let you know if that solves the issue.