Module, Park Assist (PAM): Operation

WARNING: This page is about a different car, the 2022 RAM ProMaster 3500, 2022 RAM ProMaster 2500, and 2022 RAM ProMaster 1500. However, it is still accessible from the selected car via links, so may be relevant.

The Park Assist Module (PAM) contains the park assist system logic circuits. The PAM uses On-Board Diagnostics (OBD) and can communicate with other electronic modules in the vehicle as well as with the diagnostic scan tool using the Controller Area Network (CAN) data bus. This method of communication is also used for park assist system diagnosis and testing through the 16-way data link connector located on the driver side lower edge of the instrument panel.

The PAM provides voltage to the four park assist sensors located in the rear bumper fascia. The PAM monitors return inputs from each of the sensors on dedicated hardwired data communication circuits. The sensor inputs allow the PAM to determine when an obstacle is in the rear path of the vehicle and allows the PAM to calculate the relative location of the obstacle, and whether the distance to that obstacle is increasing or decreasing.

Pre-programmed decision algorithms and calibrations allow the PAM to determine the appropriate park assist system outputs based upon the inputs received from the park assist sensors and electronic messages received from other modules in the vehicle over the CAN data bus. When the programmed conditions are met the PAM sends electronic messages to the Instrument Panel Cluster (IPC) over the CAN data bus to obtain the proper park assist system audible outputs. The PAM also broadcasts electronic messages over the CAN data bus to enable the other electronic features of the park assist system.

The PAM continuously monitors all of the park assist system electrical circuits and components to determine the system readiness. If the PAM detects a monitored system fault, it sets a Diagnostic Trouble Code (DTC) and sends the appropriate electronic messages to the IPC over the CAN data bus to control operation of certain park assist system audible warnings.

The PAM receives battery current on a fused ignition switch output (run-start) circuit through a fuse in the Power Distribution Center (PDC). The PAM receives ground through a ground circuit and take out of the body wire harness connected to the body sheet metal. These connections allow the PAM to be operational whenever the status of the ignition switch is START or ON .