Component Description

To change gear position the driver selects PRN or D by shifting the GSM lever or M by pressing the M button on the GSM when the lever is in D to select the manual mode. The GSM senses the lever position and sends a request over the Subnet Network and the High Speed Controller Area Network 2 (HS2-CAN), through the GWM over the High Speed Controller Area Network 1 (HS1-CAN) to the PCM or TCM. The PCM receives the input from the GSM, combines in vehicle conditions and engages the commanded gear in the transmission. The PCM or TCM reads the TR sensor to confirm the position of the park system.

There is a redundant Transmission Controller Area Network (TRANS-CAN) that allows the GSM to communicate directly with the PCM or TCM in the event of a malfunction in the HS1-CAN, the HS2-CAN or the GWM.

GSM 

The GSM has Hall-effect sensors that are used as inputs to indicate the lever has been moved. When P is selected above 8 km/hN is provided along with a message in the IPC. The Brake Transmission Shift Interlock (BTSI) CAN signal is used for normal function to shift from P.

RCM 

The shift by wire system uses the driver's safety belt buckle as one of several inputs to determine driver presence. If the buckle is deemed faulty for any reason the system reads this as unbuckled so that any time the door transitions to open below a set speed the PCM or TCM commands a to return to P.

PCM or TCM 

The PCM or TCM actuates the transmission in place of a conventional selector lever and selector lever cable. It receives commands from the GSM over the High Speed CAN.

IPC 

The IPC receives signals from the PCM and displays the current range of the transmission on the PRNDM. Under some circumstances messages from the shift by wire system are also displayed for the customer on the multifunction display. For example, Press Brake to shift from Park is displayed when an attempt to shift out of P and the brake is not pressed.

BCM 

The BCM provides Brake Transmission Shift Interlock (BTSI) information, GSMLED intensity status, electronic door lock commands, and ignition status to the GSM and PCM or TCM. The BCM is also responsible for customizing BTSI and other signals based on local regulations and vehicle features.