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Network Message Chart

Module Network Input Messages Powertrain Control Module (PCM) 

Broadcast Message Originating Module Message Purpose
Selector lever (PRNDL) status TCM Provides the PCM with the selector lever status. The PCM only energizes the starter relay if the selector lever is in PARK or NEUTRAL.
Crank request BCM Provides the PCM with indication that the driver has commanded the engine to crank.
Power mode BCM Provides the PCM with ignition mode.
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