16641641_0_Owner_s_Manual___Escort_Inc___Solution
[Problem] Passport does not seem sensitive to radar or laser. [Solution] 
Make sure that Passport's radar antenna is not blocked by windshield wipers and that the laser lens is not behind tinted areas. Determine if your vehicle has an Instaclear®, ElectriClear® or solar reflective windshield which may deflect radar or laser signals. Passport may be in City Mode.
Passport 6800 Owner's Manual - Escort Inc.
Solution