My 2001 lesabre has some major issues no button at all on all 4 doors work, the onstar comes on & off by itself, my cruise control only works when I keep the on/off button held down, the cigar lighters do not work, dome lights do not work. I've checked all relays and fuses in both fuse boxes. There were a few blown fuses and when I replaced them they blew right away. I've checked all wiring and connectors and they all look fine. Oh, the ac only blows cool air on the passenger side but not driver side. Could the master control switch be the root of all the issues or would it more likely be the body control module? Any suggestions ?

What fuses are blowing?

. . . and is there any water intrusion in the car? Under the carpet and/or under the back seat . . . ?

There is no moisture under the seats or anywhere inside. If I remember correctly the fuses were the individual door modules and fan 1 fuse.

I can't help you until I know for sure what circuits are shorted.

It is unusual for one of these to have like ten different problems at the same time.

Is there any chance that this car has been flooded or had major water damage in its past?

Is the car really rusty?

Has the car had any major damage or modifications?

Has any repair work etc. been done on it recently?

How many miles on the car?

How many miles have you owned it?

Does it have dual-zone climate control?

It has 75,000 miles on it, it is not rusty. 2 owners before me and they were both older people who really drove only locally and they kept up on proper maintenance. However, the car has been sitting since 2022 because the owner passed away. The owners son would drive it once every few months. Mice did get into the car and they nested. The only thing I've seen damaged was the fuel injector wires were chewed. I've carefully inspected all wires and connectors due to this. Other than mice, there'* been no other damages or mishaps, such as flooding etc. With all the different random issues I was thinking the master control switch and possibly the bcm?

It does not have dual-zone climate control. No major or minor repairs have been done, and no modification have been made to the vehicle.

I bet it is not the BCM.

How old is the battery?

Is the check engine light on?

Where did the mice nest in it?

The battery is brand new. The engine light was on for a misfire due to mice chewing the injector wire. The nest was on top of motor right by the fuel injectors. I fixed that and the light is off now. That was the only place I found a nest and damage from the rodents. I have taken panels off inside (doors, floors, & parts of dash) & checked under carpet below seats for damaged wires, I'm stumped. Connectors are all good also.