Sorry to say there is no code for that to my knowledge. That being said, if you don't want to use a guide to figure out how to increase or decrease influence with companions ingame via interactions, then there is always the option of the KSE save editor. As far as I know it has this option in it. You can find it on a website called KSE and I think in the workshop here on Steam.

Influence with other characters

You mean increase your Dark or Light Side points?

Can anyone tell me the code tonincrease influence, please?

It can, yes. But be careful when you do. Your alignment in the game is the trigger for a number of event flags. Triggering them locks you into certain actions and changing them before that action is resolved COULD soft lock you. As always, keep multiple saves and save often.

Se puede maximizar la influencia con comandos

telacloce, if you can't open the console after following the instructions then either you did something wrong somehow or your keyboard (either physical or the windows KB layout) is incompatible. I have mine set to ENG-US-Australia though I know that the ENG-US-International works as well.

Besides that, go to the installation folder of the game and delete the SWKOTOR2.ini file, then open the game and change a setting in the settings, save and then exit the game to generate a new ini file. THEN follow the above guide. Do NOT copy/paste. Type everything MANUALLY. Sometimes copy/paste leaves a space somewhere it shouldn't and the best way to avoid that is to type the line. Make sure it looks exactly like the picture above then save the file and try again.

Sorry Huro, I've looked around and from what I've found is that you need to use the explosives to get into that room regardless of your alignment. The only thing that changes is whether the Holocron is destroyed or not. It may be as you say that the check for whether it breaks or not is made at that point, or it could have been made the moment that you stepped onto the planet or the temple. You COULD use the console to change your alignment to darkside, open the door and view the Holocron, then change it back after.

It dosent work for me becuase it opens the menu and stuff

If there is then I have no idea how to use it. There is supposed to be a bug that lets you clip through walls/doors but I've never used it and I have no idea how or even if it still works. Best to google it. I also have no idea the ramification of whether it'll screw your game or not so use at your own risk.