Network Message Chart

MODULE NETWORK INPUT MESSAGES - BODY CONTROL MODULE (BCM)

Broadcast Message	Originating Module	Message Purpose
PATS status enable/disable target data	TCM	The TCM sends the BCM a challenge request for a valid ID.
Intelligent access key status	RFA module	Provide the BCM with the passive key data. The data contains information such as if a passive key has been detected, how many were detected, battery status and if it is a programmed key.
Intelligent access system status	RFA module	The response from the BCM request for the RFA module ID. If the RFA module ID response is incorrect, then the PATS prevents the vehicle from starting.

MODULE NETWORK INPUT MESSAGES - TRANSMISSION CONTROL MODULE (TCM)

Broadcast Message	Originating Module	Message Purpose
PATS start request target data	BCM	The response from the BCM supplying the TCM challenge ID. If the BCM ID response is incorrect, then the PATS prevents the TCM from applying torque.

MODULE NETWORK INPUT MESSAGES - REMOTE FUNCTION ACTUATOR (RFA) MODULE

Broadcast Message	Originating Module	Message Purpose
Intelligent access system status	BCM	A request for the RFA module ID.
Door status	BCM	Used by the RFA module to determine if it should search the interior of the vehicle for a passive key. It searches for a key if any door or liftgate/luggage compartment lid is opened and then closed.