Hello,
I have a 2000 FRC; Fixed Roof Coupe.
My passenger window stopped operating suddenly. Wouldn't go up or down, could not adjust passenger mirror or operate door locks. The left door worked OK, just the right door had problems.
I performed a check for any codes via the DIC; and found that I had "Loss of Com" with the Right Door Controller. No codes there, apparently it can't report what's wrong if it can't communicate!
I could not find a troubleshooting guide for "Loss of Com", if I had a code there are guides...

I looked at the Corvette Forum for hints and watched a couple of You Tube videos to figure out how to remove the door panel.
I tried whacking and slamming the door, but it still wouldn't work.

Checked fuses 30 and 31 and they were fine.
Luckily I have Factory Manuals for a 2003 Corvette and was able to find what kind of voltages should be at various pins on the connectors to the Right Door Control Module; DCM. Not all the signals, but at least the 12VDC, Grounds, etc.
I spent two days before I found the problem and I looked at this connection several times and can't believe it was this. To make a long story short it was a bad ground connection at the green connector on the DCM.
There was no corrosion or burn marks, it was just not enough spring tension inside the connector to make good contact with the metal pin on the DCM.
I had noticed that when everything was connected and I measured at several various ground connections on the DCM I was getting about 6 VDC instead of Zero. I thought it might be a bad ground connection at G202, which is at the floor level at the bottom of the A-Pillar, but could find nothing wrong there. Putting one lead of my Volt Meter at this ground location (G202) and then measuring with the other lead at connector C-3, pin F, I measured about 6 VDC. Measuring at several other pins and connectors; C-2, pin C, C-4, pin 9, all measured about 6VDC, instead of zero. These are all ground connection. All of these are easy to check at the door control module, but you have to find a known good ground. You could always use the negative terminal of the battery.
All these connector and pin locations have Black wires on them, so you can just back stab the connector with a paper clip and check the voltage to ground. It should be zero. If not, it's not a good ground.
I took my loose fitting pin and placed a small screwdriver into the back side of the connector to bend the little "Leaf Spring" for more tension.

Hopefully this can help someone in the future and save some time troubleshooting. Just look for zero voltage on the ground wires...

I have a few pictures that might help, but don't know how to post them. If someone is willing to post them for me, please let me know your e-mail address and I can send them to you.
Thanks for listening.

Mike

 

It's no so difficult.

 

Notice this today after I washed it, passenger side mirror doesn't work, and window! I need a little more help with the answers given in the form, where is the green connector on DCM? Where is door control module? Both doors unlocked fine, before I washed it

 

Just went to check on the control module, I touched the passenger side door accordin, and everything starts to work properly?

 

Wife just reminded me of our trip back from Indy, rained both days we were there, and on the way back home, passenger side door locks, window and mirror didn't work, as we drove home we went over a bump on the highway and everything on passenger side started to work again?

 

This problem has been extensively documented by Bill Curlee and you can read more here. It is usually caused by bad contacts in a connector within the doors' rubber accordion and, since you mentioned that after wiggling the wires at the passenger's door accordion, or hitting a bump, things temporarily worked again, it's very likely what's affecting your car.

The female pins of the connector on that wire harness get deformed, causing bad contacts and isolating the door control module. In addition to that, this could also cause a loss of communication/corruption in the Serial Data Bus affecting all modules linked by it.




Check the connectors in both doors for deformed pins. If bad pins are found you would need to repair the connector, fixing the female pins so they have a positive grip, or replace it. If you want to replace the connector take a look at this post for some ideas.

 

I do appreciate everyone's help!! But could water be the culprit?