12v aux power outlet not working

wrong fuse , the service manual covers all that.
aux = old cig cigar jack in cab ? <<<< names change in time
but is the same CIG port, for sure.
the manual calls it

Horn/Cigar Lighter/Power Outlet oh, so horn is dead too,, sure.
fuse 15 is front CIG
read outlet (omg 2) is fuse 6 , 50amps that feeds FUSE B
fuse B is 20 amps and feds aux rear center pin power.out.

fuse B box name is RELAY and fUSE BOX RFB.

The fuse for the diagnostic port is usually also the fuse for the 12v aux outlet (cig lighter)

Have you checked with a test light to see if you have power at your 12v outlet ?

Without an expensive test kit there is no way to properly test a relay. The best way would be to swap out a known working relay.
Now to address your issue, the 12v accessory outlets are not driven by a relay. They are connected via your ignition (similar to the radio or glove box light). Since they are all not working I would say that they possibly share a common ground point and that has been disconnected, or that they share multiple fuses. There could be a fuse under the dash and also a fuse in the engine bay. I would carefully read the owners manual and look for multiple fuse locations.

Take a standerd 12v test light take the clip and ground it anywhere then take the test light and touch the top of the fuse it has two sides on it touch each one if one side lights up and one doesn't it's bad both should light of remember to turn key on and headlights before doing this that way you can check them all its realy simple hope this helps

Check fusses for power outlets might be more then power out lets on same fuse check owners manual

Some of the outlets are on the aux fuse in the passenger compartment, and the others are on the AUX PWR fuse in the fuse box near the battery.
Your owners manual should list the fuse locations.

bad ground

Shud be same,look if fuse box has others incase,M

All the fuses are 12V in your car. I am assuming you mean the fuse for the cigarette lighter and auxilliary power outlet. It is fuse #20 in the rear fuse block. It is marked "CIG/AUX". It should be a blue 20 Amp fuse.