Press the ignition button in the cars. Also don't forget to release the emergency brake. Press the f key or whatever interact key that you have assigned, while looking at the toolbox.
its not working i can turn cars on but i cant open the tool box. --- Post updated --- resolved, but how do i get tools out.
I think you had to click on the tools or f. I haven't played the game for over a week so I can't remember. Also use the "edit" under your pots in the forum and don't quote your posts like you do now.
You press 2 to go into tool mode then click on a spanner or whatever, press 1 to go back to normal mode