Start/Stop Ignition Switch System (With Intelligent Access): Overview: Notes

The push-button ignition system uses the following components to achieve the 4 ignition modes (OFF, ACC, RUN and START):

• BCM
• BPP
• IA key
• RFA module
• Start/stop switch
• TPM module

To achieve any ignition mode other than OFF, the IA key must be present inside the vehicle. The driver does not need to perform any actions on or with the IA key to operate the push-button ignition system. It is sufficient that the IA key is located inside the vehicle when the start/stop switch is pressed. Pressing the start/stop switch causes the RFA module to send out a RF signal to the IA key. The IA key responds by transmitting a RF signal to the TPM module. The TPM module then sends a MS-CAN message to the RFA module that the IA key has responded. Next the RFA module sends a message over the MS-CAN to the BCM indicating that the correct IA key is present. Based on the start/stop switch and BPP switch inputs, the BCM activates the appropriate ignition mode.