You will be able to see Datacrons from quite a distance as they emit a large glow around them and shoot a beam of light into the sky. If you are very close to a Datacron you will also be able to hear the sound from them.
Datacron Locations By Planet
Nar Shaddaa – 5 Datacrons
White: Aim +3
Head to the Nikito Area. You will see a tall pole with a Datacron on top of it. There is a pile of boxes in the nearby corner you can use to climb your way up to the top. Once there, you will walk across the high wire to some pipes that connect to the roof. From there you will find a wire that connects to a platform. Jump off and walk across the wire to claim your Datacron.
Yellow: Presence +3
Location: 3341, -3286
In the Red Light Area go into the Heroic Area at coordinates 3691, 1342 . You can climb up a box then up the curtain to the top near the elevator. Take the elevator. From there just follow the path and claim your Datacron.
Red: Strength +3
Location: 2516, 3102
In the Shadow Town Area head to coordinates 2300, 3077 and start climbing up the boxes. Once you reach the top walk down the hallway and make the first right you see. At the end you go to the little pile of boxes. From there you are going to jump onto a lot of beams / pipes (this is the hard part). As you first jump on the beam you want to keep headin North until you see a pipe connected to the wall. You want to jump on top if it and climb that pipe. From there you jump on top of a lightpost and onto the square spotlight which can be used like a platform. Then you jump onto another pipe which streches out between two walls. You want to go left and drop down onto another pipe below. From there you go south where on your right there’s guess what?…more pipe jumping. Just keep going in that direction until you get on the balcony. There you take the elevator and follow the incredibly long path to the Datacron which should be the coordinace of 2516, 3102 on your map and minmap.
Orange: Cunning +3
Location: 1958, 3288
Head to the High Security Lockdown Area at 2038, 3386. Look for a pile of crates that you can use to climb up and gain access to the Incinerator Room. Once you are in this room you need to move as fast as you can to the other side. Access the console and choose the First, Second, and Third option in that order. A door will open up and you can pick up your Datacron. Be sure to loot the game machine next to this Datacron as it contains an item you need to collect your next Datacron.
Yellow Matrix Shard
Location: 1783, 3092
Inside the Network Security room just before the Transit Bridge there is a large pile of boxes. Climb up the boxes to gain access to the next level. From there you will find a game machine with a Datacron inside it. You will need to use the item you looted from the game machine when you got the Datacron in the Incinerator Room. KA BOOM! Your Datacron is yours!