System Operation

Multifunction Electronic Modules

System Operation

Battery Saver

NOTE: Time-out is 10 seconds if the vehicle is in Factory mode or 0 seconds if the vehicle is in Transport mode.
To save battery voltage, the BCM (Body Control Module) automatically shuts off the interior lamps after a 10 minute time-out period.

Post Crash Alert Function

The post crash alert is a function controlled by the BCM (Body Control Module). If the RCM (Restraints Control Module) determines an impact of enough severity has occurred (the air bags may or may not be deployed), the post crash alert function activates.

The post crash alert function:

- sounds the horn.
- turns on the interior lights.
- unlocks the doors.
- turns off the wipers, if on.

The post crash alert function can be turned off by:

- pressing the hazard flasher lamp switch (which may need to be pressed twice).
- pressing the transmitter UNLOCK button.
- pressing the RKE (Remote Keyless Entry) transmitter PANIC button.

Field Effect Transistor (FET) Protection

A FET (Field-Effect Transistor) is a type of transistor that, when used with module software, monitors and controls current flow on module outputs. The FET (Field-Effect Transistor) protection strategy prevents module damage in the event of excessive current flow. The BCM (Body Control Module) utilizes a FET (Field-Effect Transistor) protective circuit strategy for many of its outputs (such as a turn lamp output circuit). Output loads (current level) are monitored for excessive current (typically short circuits) and are shut down when a fault event is detected. A short circuit DTC (Diagnostic Trouble Code) sets when the fault event occurs. The circuit remains off until the fault is corrected, the ignition is cycled off and then back on and the module resets the FET (Field-Effect Transistor) protection and allows the circuit to function.

Gateway Function

The BCM (Body Control Module) acts as a gateway module by receiving information in one format and transmitting it to other modules using another format. For example, the BCM (Body Control Module) receives the vehicle speed data from the ABS (Anti-Lock Brake System) module over the HS-CAN (High Speed Controller Area Network), converts the data into a MS-CAN (Medium Speed Controller Area Network) message and sends (gateways) the message to other network modules such as the IPC (Instrument Panel Cluster) module. This enables network communication between modules that do not communicate using the same network (HS-CAN (High Speed Controller Area Network) or MS-CAN (Medium Speed Controller Area Network)).

Transport Mode

During vehicle build, some modules (such as the IPC (Instrument Panel Cluster) and the BCM (Body Control Module)) are set to factory mode. When the vehicle build is complete, the vehicle is set to transport mode.

Transport mode is used to reduce the drain on the battery during longer periods when the vehicle is not used. Various system functions can be altered or disabled when in the transport mode. While in transport mode, the IPC (Instrument Panel Cluster) displays TRANSPORT MODE in the message center. Transport mode can be disabled and placed into normal operation mode. REFER to Disabling Transport Mode .