2005 Sprinter how do you turn on the daytime running lights?

Check for a fuse or relay, I thought those came with them.

the daytime running lights where optional make sure it has them first, if it does they should come on automaticly

Any updates on this just bought an 06, i checked on another forum and it said i had to add 2 fuses, but when i checked i found where i had to ad the fuses there was wires connected at the other end.

The sprinters come with a sensor that turns on the lights when it starts to get a little dark. You can turn the lights on and they will turn off either a few minutes after you turn the engine off or some of them turn them off as soon as the key is taken out. Either way if you just turn the lights on the computer will turn them off and will not allow the battery to be run down.