Body Control Module (BCM)

Refer to COMPONENT INDEX .

A modified BCM is used for communications and starter relay control.

The BCM is the gateway for all bus communications needing to be gated from one bus network to a different bus network. This grants the modules on different busses the ability to interact with each other.

If the Local Interface Network (LIN) or CAN bus communications go down, the BCM will set the appropriate DTCs and display SNA values.

When an automatic cranking event (automatic cranking is defined as every engine cranking event that is not driven by an action on ignition status and that follows an Electric Stop/Start event) has been decided by the PCM, the cranking procedure is thereafter managed by the BCM as follows :

• When the BCM receives the starter relay control "No action" command signal from the PCM, the BCM opens its own cranking relay by means of a hard wired signal to open that starter control relay.
• If the BCM instead receives the "action" command signal from the PCM, then the BCM closes its own cranking relay by means of a hard wired control signal to the starter control relay to close.

The BCM receives a CAN-Interior High Speed (CAN-IHS) network bus message from the HVAC module if the HVAC module determines that the condition for an Electric Stop/Start event must be disabled for HVAC usage. The BCM gates the signal from HVAC to PCM to inhibit an Electric Stop/Start autostop. PCM will inhibit Electric Stop/Start events until HVAC module is able to perform properly during an Electric Stop/Start autostop.

The BCM receives the state of the Electric Stop/Start button in two signals over the CAN-IHS bus network from the ICS switch bank. The BCM then gates and routes those signals to the PCM.

The BCM will control the Electric Stop/Start button illumination via a CAN-IHS bus message received by the ICS switch bank from the BCM.

The BCM receives a fuel level sensor message in the form of bussed message with a voltage reading that indicates how much fuel is in the tank.