My C240 keyless entry only works when i point my key directly onto the infrared window on the driver's door handle, otherwise it is impossible to lock or unlock the car from any point. my key's batteries are New. my car is 2001. it seems only the infrared works and not the radio frequency of the keys. Please help! thanks! Update, now the driver's side is not working at all even when at close distance (1 inch) only the passangers side.Please help! thanks!