Component Description

BCM 

The BCM determines the vehicle ignition mode based on the start/stop switch input, the BPP switch input and RFA module messages. The BCM communicates the ignition mode to the other modules over the MS-CAN and the HS-CAN. The BCM monitors the start/stop switch input and the ignition mode outputs. If a fault is detected in the ignition system, DTCs are set in the BCM.

For information about the BCM functions, refer to Multifunction Electronic Modules .

Remote Function Actuator(RFA) Module 

Refer to Multifunction Electronic Modules .

Brake Pedal Position(BPP) Switch 

The BPP switch (also known as the stoplamp switch) is a dual contact switch. One set of contacts is normally open and receives voltage at all times. The other set of contacts is normally closed and is connected to ground.

When the normally open contacts close, the voltage is sent to the BCM, PCM and RFA module.

When the normally closed contacts open, the ground circuit to the PCM is momentarily interrupted.

Start/Stop Switch 

The start/stop switch is a momentary contact switch that is hardwired to the RFA module, BCM, and the PCM. The start/stop switch is connected to both the RFA module and BCM as a backup in case of a switch or circuit failure. In the event of a switch failure or a circuit failure between the switch and one of the modules, the module that receives the start/stop switch request transmits the request over the MS-CAN to the other module to enable ignition system operation.

The start/stop switch also has 2 LEDs, one is used for switch illumination and the other to indicate ignition mode. The ignition mode LED only illuminates when the vehicle is in RUN or START mode, it does not illuminate in ACC mode.