As stated, 2001 SC2, my power lock switches don't work (neither side, and no noise when trying them), dome light doesn't work at all, and power mirrors don't work. All happened at the same time. Strange thing is, that if I press any of the buttons, my trunk open light activates. All fuses are good. Where could this be coming from?

Thanks.

 

This is coming from hell.

 

I have a generic 3rd gen wiring diagram. Usually when unrelated things start happening after normal things stop working, there is a ground somewhere that is no longer grounded, so the current in the circuit travels unintended pathways

 

The current for the dome lamp the cargo lamp switch and the cargo lamp comes through the 10 amp body fuse in the ipjb.

Pull that fuse and test it outside the fuse box.
With the fuse out, try the power lock switch and see if the cargo light on the dash illuminates.

If it does, you have some fun on your hands.

Current goes in through the 10 amp body fuse.
Two branches.

Branch 1 is the hot for the dome lamp as well as the hot for the map lights if you have a sunroof.

The three position dome lamp switch can be either off, on, or in door mode, rearmost position, so they dome light comes on whenever you open the door.

When the dome light is set to on, it completes a circuit to ground into the left body ground splice pack.

On the dome light is set to door, it is connected to the dome lamp control input of the BCM. The output is the cargo lamp switch input.

This is done to tie the behavior of the dome light and the cargo light together. When in door mode only.

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Branch 2 goes to the cargo lamp, to the IP JB, where it splits into Branch 2a and 2b. The split appears to occur at the junction box itself.
2b goes directly to the cargo lamp switch which is normally open when the trunk is closed. When the trunk is opened, the cargo lamp switch closes. This completes the circuit for the cargo lamp and it illuminates.

Branch 2 a branches off from the cargo lamp circuit of Branch 2 and feeds the cargo lamp switch in terminal of the BCM. The related output of the BCM is the dome lamp control. When the dome switch is in door mode, this model comes into play, creating a second current path that can go through the cargo lamp switch. So it is a another way for the dome light to come on without the switch being in the on position.

Everything above is grounded into the left body ground splice pack. Since none of it works, the entire splice pack itself has probably become ungrounded. Look for a bunch of black wires running together into a central location. It's connection to the vehicle is probably corroded and needs to be removed and cleaned up, might even need a little sandpaper to get some fresh clean metal.

Power mirrors and windows? That will be covered later tonight

 

Same body fuse feeds power door locks.
Ground is the same body splice pack.

You know what to do

 

Any progress?