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In the underdash fuse/relay box, the 15A TAIL fuse feeds power to the coil of headlight relay 2. When the combination switch is set to TAIL, the relay closes and the outer tail lamps light. In the same underdash fuse/relay box, the 20A STOP fuse feeds power to the brake light switch. When the brake pedal is pressed, the inner brake lamps light. The underdash fuse/relay box also contains the 10A TURN BACK fuse which feeds power to the hazard switch and the turn signal relay. Relay output is fed to the combination switch and turn signal power is applied to the selected middle tail light. The fourth fuse in the underdash fuse/relay box is the 15A HAZARD fuse which feeds power to the hazard switch and turn signal relay. When the hazard switch is set, the turn lamps on both sides begin flashing.
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.
It sounds like you have burnt out bulbs. All those other lights that you say work are all different bulbs. The tail light bulbs have dual filament so that they can perform the tail light and brake light function. You should change out your bulbs and that will probably solve your problem.