Coruscant Datacron Locations
There are 5 Datacrons on Coruscant, 1 in each zone. A couple of them are not easy to get to. Your codex will state that there are 6 Datacrons. The last Dtatcron is a codex entry. You get it by entering the Lost Assembly Vault in the Jedi Temple at -3040, 2818.
Codex Entry - Galactic History 8: Hyperspace Cannons
The first Datacron is located in the Old Galactic Market zone. Its simple to get to, just ride an elevator up and kill a couple of enemies.
Coordinates: 2318, 1051
Codex Entry - Galactic History 4: King Adas
The second Datacron is locacted in Black Sun Territory. To get to it, climb up a few stacked crates to a plaform that circles the room. When you come to an area that is damaged, jump on a pipe, and walk it across to the other side of the room. On the other side you will see a smaller pipe that goes back to the other side of the room on the other side of the damaged area. Walk it over, and follow the platform around to its end against the wall. When you get to the end, look down and you will see another platform, jump on to it and walk over to the Datacron.
Coordinates: -3625, 150
Codex Entry - Galactic History 5: Rise of the Infinite Empire
The third Datacron is located in Justicar Territory. It is not easy to get to. It requires you to jump on a few boxes, jump some pipes, and then walk along some pipes.
Coordinates: 1021, 3969
(Yellow Matrix Shard)
Codex Entry - Galactic History 6: The Infinite Empire Collapses
The fourth Datacron is located in The Works. It requires you to walk a long way along some pipes. If you fall off, you could die, and you will need to restart the path again.
Coordinates: 948, 4540
Codex Entry - Galactic History 7: The First Spaceflights
The final Datacron is located in the Jedi Temple. When you are inside the center area of the temple you will see a column that as fallen over against an above platform. Go up the coloum, and circle around counter-clockwise along teh edge of the building. When you come to another large platform, go to the edge towards the center of the room and look down. You will see the Datacron. Just jump down onto the beam and walk to it. If you fall, you will most likely die.
Corrdinates: -3087, 3031
Datacron 6 Codex Entry
There is not a 6th Datacron. It is only a codex entry. To get it you need to enter the Lost Assembly Vault in the west room of the Jedi Temple at -3040, 2818. Its on your right as you come out of the elevator.