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Network Message Chart

PCM Network Input Messages 

Broadcast Message Originating Module Message Purpose
PATS start request target 1 BCM This is a request from the BCM for the PCM ID. The request is part of the PATS process of the BCM to check the PCM ID with the ID stored in the BCM.

BCM Network Input Messages 

Broadcast Message Originating Module Message Purpose
PATS status enable/disable target data PCM This is a response from the PCM to the BCM request. The BCM compares the PCM ID to the ID stored within the BCM. If the PCM ID response is correct, the engine is allowed to start.
Passive entry control data RFA module This data contains the RFA module ID (which is checked by the BCM) and information such as if a passive key has been detected, how many were detected, and if it is a programmed key. When the BCM confirms the RFA module ID and detects a programmed key inside the vehicle, it allows the ignition state to change and the engine to start.

RFA Module Network Input Messages 

Broadcast Message Originating Module Message Purpose
Passive entry target data BCM This is a response to the BCM request for the RFA module ID and passive key data. The request is part of the PATS process of the BCM to check the RFA module ID with the ID stored in the BCM. If the RFA module ID and passive key data response is correct, the engine is allowed to start.
Door ajar status BCM The RFA module uses this information to determine if it should search the interior of the vehicle for a passive key. It searches for a passive key if any door or luggage compartment lid is opened and then closed.
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