Why aren't my turn signals, brake lights, parking lights, dome lights and trunk light not working when the fuses are good?

That's your fuses check the accessory fuses they're also labeled parking accessory is the fuse you need to change on that one and make sure you don't put a higher fuse than what it requires

The dash and tail lights are on two different circuits, and the brake and turn signals are on different circuits, so at least 4 circuits total.
I would start at the headlight switch and check for power on the first two issues.

There should also be another fuse panel on the interior located on the driver or passenger side foot panels or there about.

Do the headlights work? do the tail lights work?
If you haven't checked the fuses, do that first. If they aren't blown, the next likely problem is the switch itself. These can be found in working condition from a junk yard.
My Cavalier lost it's tail lights and parking lights, but the headlights worked, I had to replace the switch on the steering column.
If it is the problem, it is not too complicated to replace yourself with basic tools. You will need a steering wheel puller and you will want to disconnect the battering. Be extra careful with the airbag.
Good luck

Get a schematic and trace out the power source to those devices not working.

Check the fuse?

the turn signal light switch has nothing to do with the brake lights,the problem is most likely the brake light switch which you should find around the area of the brake pedal it may be faulty or has come loose & needs to be adjusted & tightened back up........hope this helps......cheers.

There are TSB's for this issue. I chased this issue for months on mine. Go find the TSB's, there's troubleshooting pointing out the faulty part. It could be, the brake light switch, the hazzard light switch itself, the multi-function switch. I had replaced all of these and still had the problem. Wiring that goes from the brake switch to up near the fender was shorting against the fender. I replaced the pigtail, problem fixed. Best bet to help you, is find the TSB's for this problem.

As for the brake lights push brake pedal down while pushing on and wiggling the hazard switch.If the brake lights come on then replace the multi-function switch.

Here are the numbers on your fuseblock and fuses coresponding to the number that is on your fuse block.
1-20 amp (yellow)
Hazard flasher
2-10 amp (red)
back up lights, A/C clutch cycling Switch
3-30 amp (green)
Power windows
4-30 amp (yellow)
A/C or heater blower motor
5-20 amp (yellow)
Panel Lights, Side marker lights, Park, Taillights, Clock & radio display Intensity, License & panel lights.
#6-10 amp (red)
Stoplight, buzzers, Anti-lock brake module
#7-15 amp (lt. Blue)
Tachometer, horn & Relay
#8-8 amp (yellow)
Power Door locks
#9-10 amp (red)
Radio
#10-10 amp (red)
Rear Wheel Anti-lock module, Turn Signals
#11-20 amp (Yellow)
Windshield wiper & washers
#12-15 amp ( LT. Blue)
Cigarette Lighter
#13-5 amp (tan)
Speed Control, warning buzzers, gauges, indicator lights
#14-5 amp (tan)
Time/delay relay & under-hood light, dome light, power mirrors, readio & clock Memory, Interior lights, reading lights
#15-blank
Not used
#16-4 amp (pink)
Radio Lights & overdrive switch light 1989-91, Cluster lights, Cigarette Lighter light & as tray light, Cluster lights, A/C & heater controls.
#17-relay
Hazard Flasher warning
#18-relay
Relay
#19-Circuit breaker
#20-relay
Turn signal Flasher
#21-buzzer
Warning
#22-Relay
Horn