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In the diagram for rear lamp, the top wires are voltage, the bottom black wire is ground. The brown wire on either side should be tail lamps, goes hot when you turn on the headlamp switch. The other top wire on either should be for turn signal. With everything turned on, is there voltage on that wire?
Because the front works and the rear don't, possible wiring circuit problem? The voltage for turn signals comes from bcm. The bcm knows when you turn on turn signal switch, either side, then the bcm sends voltage to turn signal lamp at the rear and front.
Turn signals are usually very reliable and problems mostly begin when a bulb is carelessly replaced. Other than this most problems are related to the hazard warning switch which tends to be used so infrequently the internal switch contacts become dull or dirty and so when it is operated causes turn signal problems, including them not working at all.
Usually spending a few minutes rapidly operating the hazard switch puts matters right.
It is also worth checking the fuse(s) before resorting to voltmeters and wiring diagrams.
This may sound confusing, so here goes. Normally I would say check the turn signal switch because for decades the brake light switch power went thru the turn signal switch. But in your case, its more complicated. The wiring diagram looks like you have a wire from the brake switch and another from the turn signal that joins inside the right and left rear tail lamp assembly. There are also fuses in the rear fuse box including one for just the brake lights. So its possible that fuse is dead and yet the turn signals would work. You may have to get a book with the wiring diagrams to trace the circuits.
if your hazard lights stay on, you may have a problem with the hazard switch on your stearing collum. try moving it back & forth several times, eg. on, off, on, off always ending @ off & see if that works. they do get sticky @ times. your brake lights will work but your turn signals won't work properly with the hazard switch turned on. let me know if problem persists & will see if i can help you more. good luck.
Your Hazard switch is bad. There were a bunch that had faulty soldering connections, and would fail prematurely. This circuit also competes with the turn signals, and the brake lights. Replace the switch with an aftermarket replacement, and it should fix your issue.