Push Button Start System: Notes

The START/STOP button (ignition switch) is used to control the ON, OFF and START ignition modes.

Battery voltage is supplied to the push button ignition switch. When the button is pressed, voltage signals sent out on two separate circuits. One is provided to the BCM and the other is shared by the RFA module and the PCM, indicating a request to change the ignition state. Changing the ignition state from the OFF mode works in conjunction with the PATS. A programmed key is required to change the ignition from OFF to ON. For additional PATS information, REFER to: Passive Anti-Theft System (PATS) - System Operation and Component Description

With the ignition off and the START/STOP button is pressed, and the RFA module (or the BCM) detects a programmed key, the BCM provides ground to the coil side of the ignition relay and sends an ignition status message over the CAN to other modules to indicate the ignition state change. Unlike a conventional ignition switch system, the push button start system does not have an ACC mode. The BCM only utilizes the OFF, ON and START modes. Each time the ignition state changes, the BCM sends ignition status change to other vehicle modules.

Refer to the following table for information about achieving the various ignition states.

The RFA module or the BCM must recognize a programmed key before the ignition state changes from OFF.