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.