Does anyone know where the Rear Object Sensor Module is located? When the engine is cold the reverse sensors work fine, but after the engine is warmed up, and I have driver to a location, turned off the car, do my errands and return to the car and start it, I get the "reverse warning service required". This happens every day, no matter how long I drive. Everytime I get to my location and shut off the engine and restart it, I get the message. Any ideas? Thanks!