Unlocking When the Key Fob Doesn't Work
If Model S does not unlock when you walk up to it, or when you double-click the unlock button on the top of your key fob, the key fob’s battery may be dead. Even if this is the case, you can still use the key fob to unlock and drive Model S.
To unlock Model S (and disable the security alarm) using the key fob, first position the key fob near the base of the passenger side windshield wiper. Then press the front door handle on the right side of the vehicle. If Model S doesn't unlock, try adjusting the position of the key fob and try again. The key fob must be in the correct position for the vehicle to unlock.
To drive Model S after gaining access to the cabin, place the bottom of the key fob against the center console, immediately below the low voltage power outlet, then press and hold the brake pedal to start Model S.