System Operation
System Diagram
Network Message Chart
Module Network Input Messages - BCM
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Passive entry_control code | RFA module | Tells the BCM with the IA key data. The data contains information, such as if an IA key has been detected, how many were detected and if it is a programmed key. It also contains the RFA module ID which is checked by the BCM. |
| Passive entry_fob number | RFA module | Tells the BCM which specific programmed IA key is in use. |
| Ignition status (power pack status) | PCM | Provides the BCM with the current ignition status of the PCM. |
OFF
To enter OFF mode, press the start/stop button without pressing the brake pedal while the vehicle is in ACC mode, RUN mode or while the engine is running. The IA key does not have to be in the vehicle to achieve OFF mode. However, the IA key must be present to achieve any other ignition mode.
When the engine is running and any one of the vehicle doors is opened and then closed, the RFA module transmits a radio frequency to activate the IA key. If present, the IA key transmits a radio frequency signal to the TPM module. The TPM module sends a message to the RFA module indicating that the IA key is present.
If the IA key is not present, the message center displays NO KEY DETECTED to alert the driver that the IA key is not present.
If the IA key is not present while attempting to enter OFF mode, the message center displays RESTART NOW OR KEY IS NEEDED. The driver then has up to 20 seconds to restart the vehicle without an IA key being present in the vehicle.
ACC
To enter ACC mode, with the correct IA key inside the vehicle, press and release the start/stop switch one time without pressing the brake pedal. Once the BCM receives the message from the RFA module that the correct IA key is present inside the vehicle and the BCM has detected the start/stop switch input without the BPP input, the BCM activates the internal RUN/ACC bus and internal RUN/ACC relay. The BCM also sends the ignition mode message to the other modules over the MS-CAN and the HS-CAN.
Once the ignition has entered ACC mode, the message center displays, PRESS BRAKE TO START and then ACCESSORY POWER ACTIVE.
RUN
To enter RUN mode, with the correct IA key inside the vehicle, press the start/stop switch for a minimum of one second without pressing the brake pedal. Once the BCM receives the message from the RFA module that the correct IA key is present inside the vehicle and the BCM has detected the start/stop switch input without the BPP input, the BCM activates the internal RUN/ACC bus, the internal RUN/START bus, the RUN/ACC relay and the RUN/START relay. The BCM also sends the ignition mode message to the other modules over the MS-CAN and the HS-CAN.
Once the ignition has entered RUN mode, the indicator in the start/stop switch illuminates and the module controlled indicators in the IPC momentarily illuminate to prove they are functioning correctly. For IPC prove out information, refer to Instrumentation, Message Center, and Warnings .
Start
To enter START mode, with the correct IA key inside the vehicle, press and hold the brake pedal, then press and release the start/stop switch. Once the BCM receives the message from the RFA module that the correct key is present inside the vehicle and the BCM has detected the BPP input with the start/stop switch input, the BCM activates the internal RUN/START bus and the RUN/START relay. The BCM also sends the ignition mode message to the other modules over the MS-CAN and the HS-CAN.
The engine can be started from any ignition mode. Once the ignition has entered START mode, the indicator in the start/stop switch illuminates.