Tested fuse box under driver seat no power there for brake light turn signal right side
Body Control Module (BCM) is located in the
Lower right side of the instrument panel behind the knee bolster !
It's not the BCM. Since one side works and the other doesn't. The bcm only grounds a relay for the the lights to work. Replace the hazard switch. If it is on the column, replace the turn signal switch. Sending a picture to help. 
SOURCE: Body Control Module - 2000 Chevy Blazer
Not sure about a body control module, there is a pcm under the hood on the pass. side that controls most everything on these, however i would check your fuses for the seat, on the 00 models the headlights do stay on all the time while driving due to daytime running lights but if they stay on after you take the key out then id check the headlight switch or sensor on the pass side dash.
SOURCE: Can not find 2000 Chevy Cavalier Flasher Unit
the relay unit is under the dash near the steering wheel should be connected to the searing shaft it looks like a small square green or black the relay is about 35$
SOURCE: Park/Tail lights not working. Brake/signals are
Before going ahead and spending money on a new module, test it first. The module is located under the steering column. You'll find a Brown wire on one of the connectors (i just looked at a wire diagram). Do no disconnect anything. Back probe the brown wire, which is the power feed to your park lights. With the lights off, there should be 0 volts on you voltmeter. Turn the park lamps on, There should be 12V. If there is not 12V, disconnect the connector and try to check voltage at the pin that feeds to the brown wire, if still not 12V, replace the module. If you do get 12V, then module is ok, find where the 12v is being dropped before making it to the lamps.
SOURCE: 2000 Buick LeSabre where power locks, seats, windows quit working
If all power devices stopped at the same time you may have a bad fuse link. Since it is rare for all the fuses blowing at once and you already checked them. Start at your fuse links before assuming something expensive.
SOURCE: I have A 2000 Chevy 3500 Express Van and the brake
Hi,
When you said that you checked the brake switch, did you check it live? Meaning verified live power to the switch, press switch, and then power came out the other terminal?
If so, also verify zero power on brake press, at the offending brake light bulb terminal. You must verify the test light each time you move it...leave running lights on...
After verifying that there is no power coming, after the brake is pressed, note the wire color and find it where it comes to the steering column and test there... This would eliminate wires and connections between front and the rear of the vehicle, unlikely, but needs to be tested.
After verifying no power at that terminal, then yes the t/s switch is certainly suspece. This may be the time to get a mechanic to verify and replace the switch, there are locks, tilt mechanisms, air bags, column bearings, etc involved. Failures risk loss of vehicle control (locking or binding for example.)..
Hope this gets you going in the right direction.
Testimonial: "Thank You. I tried those things and it seemed to be the Emergency Flasher switch in the multi function switch."
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