Lexus es350 will not start and it gives key not detected message

that sounds like a security system issue. I would start investigating there.

Push the little valet switch in the glove box.

Edward, fuse box above drivers feet under dash.
you may want to check out attached links for fog light problems.
07 Es350 Fog light relay Club Lexus Forums

Lexus ES 350 fog lights fuse location Google Search

Replace Fuse 2007 2012 Lexus ES350 2008 Lexus ES350 3 5L V6

Fog Lights Not Working

I assume it's running by now. I would have made sure the battery is fully charged first then lock/unlock the driver's door several times with the chipped key.

Yes the your Lexus does have a physical key slot to start the car

Checked the glove side button, tried to press all the buttons still won't work. What could be the possible problem that the truck won't open? There is no manual key way to open the trunk which now sounds ridiculous!! Please help!!

The ES350 battery should have been under warranty, so this should be done at a dealership who would in turn check your keys....You will likely have to return to a Lexus dealership with both master keys and have them reprogrammed, however try holding the key directly to the dsh beside the ignition switch for about ten seconds, then push the ignition button.

THE KEY MIGHT NOT BE CUT RIGHT OR INGNTION ITSELF MIGHT BE GOING OUT ON IT

most likely your key battery needs to be replaced. due to the involvment of the key, it uses alot more battery power then older cars and the battery should be replaced every year. hope that helps.