Network Message Chart

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

PSCM Network Input Messages

Broadcast Message	Originating Module	Message Purpose
Active park assist request	IPMA	This message is first sent to the GWM and then to the PSCM. The IPMA is an internal component of the Advanced Driver Assistance Systems (ADAS) module. Used to command the EPAS gear during parking aid maneuvers.
Ambient temperature	FCIM	The PSCM module uses this information for calculations in determining the operational status of the various steering and parking systems.
ABS active	ABS module	Confirms the operational state of the ABS.
Battery voltage	BCM	This message is first sent to the GWM and then to the PSCM. Provides the PSCM with the 12-volt battery and charging system voltage.
Brake pedal position	PCM	This message is first sent to the GWM and then to the PSCM. Informs the PSCM of the current brake pedal position; pressed or released. This information is used for active park assist operation.
Drive wheel torque	PCM	This message is first sent to the GWM and then to the PSCM. Informs the PSCM of the current torque output available at the driven wheels. This information is used for active park assist operation.
Ignition status	BCM	This message is first sent to the GWM and then to the PSCM. Confirms the ignition status of the vehicle.
Lane centering information	IPMA	This message is first sent to the GWM and then to the PSCM. The IPMA is an internal component of the Advanced Driver Assistance Systems (ADAS) module. Provides the PSCM with the necessary information for lane centering. Such as driver hands off the wheel, lane centering system status,
Lane keeping aid information	IPMA	This message is first sent to the GWM and then to the PSCM. The IPMA is an internal component of the Advanced Driver Assistance Systems (ADAS) module. Provides the PSCM with necessary lake keeping information such as system status, if intervention is required for the lane keeping aid feature, how much assist is needed, or if driver over-ride is occurring or needed.
Odometer master value	IPC	This message is first sent to the GWM and then to the PSCM. Informs the PSCM of the current odometer millage. The PSCM uses the odometer information for various self diagnostics.
Reverse gear selected	PCM (gasoline engine)	This message is first sent to the GWM and then to the PSCM. Informs the PSCM the transmission is currently in REVERSE gear. This information is used for active park assist operation.
Reverse gear selected	TCM (diesel engine)	This message is first sent to the GWM and then to the PSCM. Informs the PSCM the transmission is currently in REVERSE gear. This information is used for active park assist operation.
Selectable drive mode	ABS module	Informs the PSCM of the current chassis drive mode request.
Stability control brake active	ABS module	Confirms the operational state of the stability control system.
Steering angle offset	ABS module	The ABS module calculates steering angle based on wheel speed sensor information. The PSCM uses this information to verify other steering wheel angle information.
Steering angle request	IPMA	This message is first sent to the GWM and then to the PSCM. The IPMA is an internal component of the Advanced Driver Assistance Systems (ADAS) module. Used to command the EPAS gear during active park assist maneuvers.
Steering wheel position - non-adaptive steering	ABS module	Used to verify the validity of the steering angle sensor.
Steering wheel position - adaptive steering	SCCM module	This message is generated by the SASM and is sent to the SCCM. The message is then sent to the GWM and then to the PSCM. Informs the PSCM of the adaptive front steering sensor calibration and sensor status. This message is used for active park assist system function.
Trailer backup assist disable request	APIM	This message is first sent to the GWM and then to the PSCM. Used to disable the PSCM for PTBA operation for the trailer chosen by the driver.
Trailer backup assist enabled request	APIM	This message is first sent to the GWM and then to the PSCM. Used to enable the PSCM for PTBA operation for the trailer chosen by the driver.
Trailer backup assist switch request	TRM	This message is first sent to the GWM and then to the PSCM. Used to provide the current PTBA control knob position and button status; pressed, not pressed.
Trailer connection	TBM	This message is first sent to the GWM and then to the PSCM. Informs the PSCM a trailer is connected to the vehicle.
Trailer data	IPMA	This message is first sent to the GWM and then to the PSCM. The IPMA is an internal component of the Advanced Driver Assistance Systems (ADAS) module. Provides the trailer data for the current active trailer. Includes the trailer identification and all the trailer measurements stored in the Advanced Driver Assistance Systems (ADAS) module.
Trailer lamp connection	TRM	This message is first sent to the GWM and then to the PSCM. Informs the PSCM trailer lamps (tail lights, turn signals and side markers) are connected to the vehicle.
Trailer yaw rate	RCM	Used by the PSCM for steering assist calculations.
Transmission gear lever position	PCM (gasoline engine)	This message is first sent to the GWM and then to the PSCM. This message informs the PSCM of the current driver selected transmission gear.
Transmission gear lever position	TCM (diesel engine)	This message is first sent to the GWM and then to the PSCM. This message informs the PSCM of the current driver selected transmission gear.
Turn signal status	SCCM module	This message is first sent to the GWM and then to the PSCM. Informs the PSCM of the current, driver selected turn signal switch status; off, left, or right. This message is used for lane keeping system function.
Vehicle configuration information	BCM	This message is first sent to the GWM and then to the PSCM. Used to compare the PSCM configuration against the vehicles specific configuration (central car configuration).
Vehicle lateral acceleration	ABS module	Used by the PSCM for steering assist calculations.
Vehicle longitudinal acceleration	ABS module	Used by the PSCM for steering assist calculations.
Vehicle speed data	ABS module	Used to determine the level of assist supplied to the steering gear and to validate the steering wheel component angle by comparing the rotational speeds of each wheel. The difference in the speed of each wheel is used to derive a steering angle for comparison against the EPAS motor position sensor.
Vehicle yaw rate	ABS module	Used by the PSCM for steering assist calculations.
Vehicle yaw rate	RCM	Used by the PSCM for steering assist calculations.
Wheel speed sensor information	ABS module	Provides the PSCM with wheel speed sensor information such as number of rotations, rotation speed and direction of rotation. Used by the PSCM for steering assist calculations, trailer back up assist and active park assist.