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Hi all. First off Happy Easter to all. I have a 2000 Catera and it has my head spinning right now, See title. To start. Sometimes the car will not start, you turn the key on and it turns off like you shut the key off. I figured this out. There is a fuse block on top of the battery, all 4 fuses were corroded and losing connection. I have to get 4 new fuses but for now I cleaned all connections and the fuses are all supplying full voltage now. The Speedo, odometer are not working at all. There were 3 codes related to VSS circuit So I replaced the VSS and inspected the VSS plug. Now the codes are gone but the speedo and odometer are still not working. The ABS, TCS lights are both on, not sure if it is related to above The radio, trunk release, on star, fuel door, traction button all do not work at all. The radio doesnt even display anything, and the trunk is useless because there is no keyhole. I checked all fuses, at least I think I did, I took care of the ones in the block at the battery, and there is no blown fuses in the box next to the battery. I found another fusebox below the steering wheel and all were good except one 30 amp heated seat fuse. I replaced the fuse and it did not pop. I was told that when it dries out that things start to work again. She said that when the radio works, the on star, trunk, fuel door, and traction all works. But when it rains or gets wet everything quits working. Today I spent almost 5 hours on the car and found out that the rear carpets are soaked. I removed the drain plugs at the rear floors and let it drain. I pulled all the sill trims and the rear seat. I found 2 things that make me worry. 1. at the right front kick panel there is a module and there are several wires tapped into the wires to the module. I dont know if this is for the on star or what but All connections were intact. 2. There is a harness under the rear seat. 5 wires maybe that look to have gotten hot. Dont look damaged but there is a groove in the matting on the floor and it is all black like the harness melted the groove. I dont expect any miracles here but am just looking for a step in the right direction. I also worry about a fire hazard when there are so many electrical problems, and water may be involved. I only have 1 code now that my scantool shows, constant, as soon as you clear it it comes right back, U2108, unsure of the definition. Thanks all for reading