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Follow the flasher wiring to fuse box and locate the fusible link. Looks just like the wire but softer exterior and it's a fuse able wire that can break down. Should be along the driver fender under hood.
At this point you will need to replace the multifunction switch. It looks like used may be a good option for your vehicle. This is a relatively easy part to replace. You will need a couple TORX sockets but other than that its pretty straight forward once you remove the column covers.
In my experience, when the hazards are on, the brake lights are not supposed to indicate braking in this day and age of automobiles. In other words braking lights will not override the hazards when hazarding. I believe the 3rd or high mount brake light should work when hazarding and braking at the same time to indicate you are braking. I find it very seldom is there the need to drive and have the hazards on....in torrential rain going at low speed perhaps. Anyway, hope this was helpful. If not, I apologize.
I am unaware of what a "CO" display is.
Now with the blinkers, hazard, horn and brake lights not working that may be the multi funtion switch (blinker switch) that is located inside the column (where the blinker lever attaches).
Obviously the blinker, hazard and horn will all work off of something in the column. Brake lights, you may think a switch on the pedal.
the brake lights do work with that switch but when you have the kind of tail lights where a turn signal light shares the same bulb as a brake light, the brake light is cancelled for the turn signal by running through the multi function switch inside the column.
The third brake light does not blink so its not on that same circuit.
The turn signal flasher relay may have a problem.Turn on the hazards and follow the clicking sound to the source and usually the hazard flasher and turn signal flasher are very close to each other.Remove the one that is clicking and put it in place of the turn signal flasher.If the Turn signals then work you will need to purchase a new turn signal flasher relay.They are usually just a few dollars.
No Turn Signal Operation (blinker)The turn signal lights in your car are a basic electrical system that controls the front and rear blinker lights to alert the intended direction of the vehicle. We have listed some of the most common problems and repair troubleshooting tips below: Troubleshooting Procedure To start troubleshooting this problem:
Turn the key to the on position (do not start engine)
Inspect the system fuse located in the fuse panel and replace if needed. If you cannot find the location of the blinker fuse consult your owner's manual or an online repair manual
When a blinker flasher fails it can cause blinker lights to say on, not blink, or not go on at all. To test the blinker system flasher, remove the flasher unit and insert a jumper wire between the two terminals. If blinker stays on in both directions without blinking, replace the flasher. If you cannot find the location of the blinker flasher consult your owners manual or an online repair manual.
check for the complete fuse box and search for short circuits. Check the fuses and the amps of each. Did you change the battery for a new one? Did you install any device not OEM? An alarm? Check the cable system. If this is ok, scan it.