Park Assist Switch - Operation

OPERATION

The status of the park assist controls are continually monitored by the Integrated Center Stack (ICS) Screen (1), also known as the U-Connect Touch (TM) screen module. The ICS receives battery voltage at all times on a fused battery feed circuit, and a path to ground at all times through the instrument panel wire harness. The inputs to, and outputs from the ICS consist of electronic communication with the Body Control Module (BCM) over the Controller Area Network (CAN) data bus.

Each time the park assist controls are used the ICS circuitry sends an electronic park assist switch status message input to the BCM over the CAN data bus. The BCM then sends an electronic park assist switch request message to the park assist module over the CAN data bus. The park assist module responds to each park assist switch request message by toggling the status of the park assist system from enabled to disabled, or from disabled to enabled, then sends an electronic park assist system status message back to the BCM over the CAN data bus as confirmation.

The BCM responds to the system status message received from the ICS, by sending a message to the IC over the CAN-C data bus to display Park assist system off in the Electronic Vehicle Information Center (EVIC) display; when the system has been disabled by the vehicle operator. The Park assist system off message will display each time the ignition switch is in the ON or START positions, and remain that way until a bus message is received that the system has been enabled.

The hard-wired circuits between components related to the park assist switch may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the electronic controls or communication between modules and other devices that provide some features of the park assist system. The most reliable, efficient, and accurate means to diagnose the park assist switch or the electronic controls and communication related to park assist switch operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.