2008 SRX Back up sensor staying lit Red.
 

I have a 2008 SRX that when I look in the rear view mirror, the red light above the tailgate remains Red, while the 2 amber colored lights do not. Even with the car in the off position the red light is dimmed, and when the ignition is "on", the red light remains on a stronger red. I checked the Driver Information Center and checked the 'Parking Assist', and it is in the On position. I turned it into the Off position and restarted the vehicle, and it still stayed lit. I switched it back to the on position. Any idea what it could be? I haven't checked underneath the car for a loose connection yet. Thank you.