Description And Operation: Operation

WARNING: This page is about a different car, the 2020 Jeep Renegade. However, it is still accessible from the selected car via links, so may be relevant.

The status of the park assist OFF switch and the Parallel and Perpendicular Park Assist (PPPA) ON switch is continually monitored by the circuitry within the instrument panel switch pod. The switch pod receives battery voltage at all times on a fused battery feed circuit and has a path to ground at all times through the instrument panel wire harness. The inputs to and outputs from the switch pod consist of electronic message communication with the Body Control Module (BCM) over the single wire Local Interface Network (LIN) data bus.

Each time the park assist OFF switch or PPPA ON switch push button is depressed the switch pod circuitry sends an electronic switch status message input to the BCM over the LIN data bus. The BCM then relays an electronic switch request message to the Park Assist Module (PAM) over the Controller Area Network (CAN) data bus. The PAM responds to each switch request message by toggling the status of the appropriate park assist system feature from enabled to disabled, or from disabled to enabled, then sends an electronic system status message back to the BCM over the CAN data bus as confirmation.

The BCM responds to the system status message by sending a message to the switch pod over the LIN data bus to control the park assist OFF switch or PPPA ON switch Light Emitting Diode (LED) units so that they are illuminated only when appropriate while the status of the ignition is ON, and are extinguished when the status of the ignition is anything except ON. If the park assist system is disabled due to a monitored fault or failure, a press of the park assist OFF push button will result in the LED flashing on and off for about 5 seconds, then lighting solid.