Network Message Chart

Module Network Input Messages: Power Steering Control Module (PSCM)

Broadcast Message	Originating Module	Message Purpose
ABS active	ABS module	This message is first sent to the GWM then to the PSCM. Used to confirm that the ABS is operational.
Driven wheel torque	PCM	This message is first sent to the GWM then to the PSCM. Used for torque steering compensation
Engine speed	PCM	This message is first sent to the GWM then to the PSCM. Engine speed monitored to initiate EPAS activation and continued operation.
External steering angle request	Parking Aid Module (PAM)	Used for active park assist steering function.
Power mode	BCM	Used to confirm the ignition status of the vehicle.
Stability control brake active	ABS module	This message is first sent to the GWM then to the PSCM. Used to confirm the operational state of the stability control system.
Steering angle counter	SASM	Used to verify the validity of the steering angle message.
Steering angle status	SASM	Used to confirm the steering angle sensor is initialized and operating correctly.
Steering wheel direction of rotation	SASM	Used to confirm the direction in which the EPAS motor is driven.
Traction control brake active	ABS module	This message is first sent to the GWM then to the PSCM. Used to confirm the operational state of the traction control system.
Transport mode	BCM	Used to confirm the vehicle is in normal operation mode, factory mode, transport mode or a crash event has been identified and the vehicle has been set to a post crash configuration.
Vehicle configuration/information	ABS module	This message is first sent to the GWM then to the PSCM. Used to compare the PSCM configuration against the vehicles specific configuration (central car configuration).
Vehicle speed	ABS module	This message is first sent to the GWM then to the PSCM. Used to determine the level of assist supplied.
Wheel speed data	ABS module	This message is first sent to the GWM then to the PSCM. Used 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 absolute steering angle message from the SASM.