Push Button Start System

This vehicle is equipped with a PATS  that disables the engine from cranking if an unprogrammed PATS  key is used or an invalid PCM ID  is received. The PATS  is controlled by the BCM  . If there is a PATS  concern that causes the engine to be disabled, the IPC  displays the corresponding message in the message center. For additional information, Refer to: PASSIVE ANTI-THEFT SYSTEM (PATS) - SYSTEM OPERATION AND COMPONENT DESCRIPTION .

Ignition modes are controlled by the RFA  module and the BCM  . For additional information on the ignition switch - push button start modes, Refer to: STEERING WHEEL AND COLUMN ELECTRICAL COMPONENTS - SYSTEM OPERATION AND COMPONENT DESCRIPTION .

The ignition switch - push button start is connected to the RFA  module and the BCM  as a backup in case of a failure. If there is a circuit failure to either module from the ignition switch - push button start, the modules communicate the ignition switch - push button start request to each other over the Medium Speed Controller Area Network (MS-CAN).

During a start event the ignition switch - push button start is pressed in combination with either the brake pedal (automatic transmission) or the clutch pedal (manual transmission) input. The RFA module, the BCM  and the PCM  receive a request to start the engine. The PCM  recognizes the correct inputs and provides voltage and ground to energize the starter relay coil and close the starter relay contacts. The starter relay contacts close, providing voltage to the starter solenoid, allowing the starter motor to crank the engine. The PCM  disengages the starter motor once an engine Revolutions Per Minute (RPM) threshold is reached, a set crank time is exceeded or the ignition switch - push button start is pressed indicating an engine shutdown.