Circuit/System Description

WARNING: This page is about a different car, the 2008 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.

The object alarm module directly controls the rear parking assist (RPA) display. The RPA display consists of 2 amber and one red LED that indicate the distance of an object from the rear bumper. The object alarm module will also use an audible warning by sending a serial data message to the radio. Each object sensor is a 3-wire sensor that is both a transmitter and a receiver that includes a signal circuit, a low reference circuit, and an 8-volt supply voltage circuit. The object alarm module supplies 8 volts to the object sensors via the object sensor supply voltage circuit and provides ground via the low reference circuit. The object alarm module triggers the sensors in a sequential loop and after each sensor transmits, the object alarm module uses the echo or signal return to calculate the distance and position of an object from the rear bumper.