Push Button Start Ignition System Overview

The push button start ignition system uses the following components:

• Ignition switch (push button start)
• BCM 
• Stoplamp switch
• Front PATS  antenna
• Passive key
• RTM 
• PCM 

The available push button start modes are:

• OFF
• ON
• START

To achieve any ignition mode other than OFF, the passive key must be present inside the vehicle. The driver does not need to perform any actions on or with the passive key to operate the push button start system. Pressing the ignition switch causes the BCM  to activate the front PATS  antenna. The front PATS  antenna then sends out a Radio Frequency (RF) signal to the passive key. The passive key responds by transmitting a Radio Frequency (RF) signal to the RTM  . The RTM  then sends a CAN  message to the BCM  that the passive key has responded. Based on the ignition switch and stoplamp switch inputs, the BCM  activates the appropriate ignition mode.