Description And Operation
DESCRIPTION
The Park Assist Module (PAM) (1) for this vehicle is secured on the inboard side of the right rear of the vehicle behind the interior quarter trim panel. The module is connected to the vehicle electrical system through dedicated take outs of the body wire harness.
There are three mounting tabs integral to the module housing that secure the module to the vehicle body. Two connector receptacles containing terminal pins that connect the module to the vehicle electrical system are integral to one side of the housing. One of the receptacles is utilized in vehicles equipped with only the rear park assist system, while both receptacles are used on vehicles equipped with both the front and rear park assist systems.
The PAM cannot be adjusted or repaired and, if damaged or ineffective, it must be replaced with a new unit. The PAM software is flash programmable.
OPERATION
The PAM has the following characteristics:
- Receives battery current on a fused ignition output (RUN/START) circuit through a fuse in the Power Distribution Center (PDC)
- Receives ground through a ground circuit and take out of the body wire harness connected to the body sheet metal.
- Continuously monitors all of the park assist system electrical circuits and components to determine the system readiness.
- Provides voltage to the park assist sensors located in the bumper fascias
- Monitors return inputs from each of the sensors on dedicated hard wired data communication circuits. When an obstacle is detected the sensor inputs allow the PAM logic to calculate the relative location of the obstacle, and whether the distance to that obstacle is increasing or decreasing.
- It manages the presence of a possible trailer: it is configured to deactivate the rear sensors when a trailer is present.
- It communicates and transmits data over the high-speed Controller Area Network-Chassis (CAN-C) network.
When the programmed conditions are met the PAM sends electronic messages to the Instrument Panel Cluster (IPC) over the CAN data bus via the BCM to obtain the proper park assist system audible outputs and textual messages in the IPC display. The PAM also broadcasts electronic messages over the CAN data bus to enable the other electronic features of the park assist system.
If a tow hook is present, the signal "Trailer presence" informs the PAM control unit to deactivate the rear sensors if a trailer is attached to the vehicle. The signal "Trailer presence" is sent by the Trailer Tow Module (TTM) via CAN-Internal High Speed (CAN-IHS) data bus. To ensure the proper operation of the system when the trailer is not attached to the vehicle, the PAM changes the sensor detection area range in order to take into account the space occupied by the tow hook.