After reviewing the service manual, there is no switch. The only way to 'disable' the DRL is to remove fuse # 15 as shown on page 410 of the Owner's Manual.
However, the Service Manual does have the following note(Chapter 22, page 163):
The DRL are disabled when the ignition switch is turned to LOCK(0). To keep the DRL from coming on, apply the parking brake switch while the ignition is in the LOCK(0) position. When you then turn the switch back to ON(II), the DRL will not come on until the parking brake is released. The headlights revert to normal operation when you turn them on with the headlight switch.
The only logic I can find in that is the DRL are designed to make a car in motion more visible. If you are parked with the hand-brake pulled why put the load on the bulbs if you don't need to. I park near a wall and can see mine come on when I start the car in the morning. If it is dark I can use them to guide me into my parking space

So I know mine are working correctly.