Starting System - Vehicles With: Keyless Entry and Push Button Start - System Operation and Component Description

System Operation

System Diagram

Network Message Chart

  Module Network Input Messages BCM

  Module Network Input Messages Powertrain Control Module (PCM)

Starting System

This vehicle is equipped with a PATS that disables the engine from starting 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 disables the engine, the IPC displays the corresponding message in the message center.
Refer to: Perimeter Anti-Theft Alarm - System Operation and Component Description (419-01A Perimeter Anti-Theft Alarm, Description and Operation).

Ignition modes are controlled by the BCM . For more information on push-button start REFER to 211-05

The ignition switch - push button start is connected to the BCM and the PCM 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 High Speed Controller Area Network (HS-CAN).

During a start event, the ignition switch - push button start is pressed in combination with the brake pedal. The BCM and the PCM receive a request to start the engine. The PCM requires input voltage from the Run/start relay.

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 request.

Remote Start System

Under normal operation, when equipped with remote start, a remote start event is initiated by pressing a sequence of buttons on the passive key. The factory equipped remote start system does not operate if the hood is not closed.

The remote start system enables the engine to be started from up to 100 meters (328 feet) away and is activated by pressing the lock button on the passive key, to make sure the doors are locked, followed by 2 presses of the remote start button. The 3 button presses must occur within 3 seconds. The system acknowledges the start request by flashing the exterior lights twice. Once started, the engine runs for 10 minutes (default run time is 10 minutes; the time can be programmed by the customer to 5, 10 or 15 minutes) and the parking lights remain illuminated until the cycle is complete. The remote start duration can also be extended by initiating remote start while the first timer is still running or by initiating a completely independent start cycle when the first has completed. No more than 2 remote start sequences can occur within a one hour period, unless the ignition is set to the RUN/START position between the remote start requests. During the remote start cycle the power windows are inhibited and the radio will not turn on automatically but may be switched on manually from inside the vehicle. If the remote start system fails to start the horn will chirp twice.

To transition from remote start mode to drive mode, use a programmed passive key to transition to RUN. If a programmed passive key is not used, the engine shuts off.

To deactivate the remote start system, press the remote start button once. When deactivating the remote start system the parking lights turn off to give a visual indication that the engine and climate control features have turned off. It may be necessary to be closer to the vehicle to deactivate the remote start feature than it was to initiate it due to ground deflections and added noise from the engine running.

Component Description

Ignition Switch - Push Button Start

The ignition switch - push button start is a momentary contact switch that is hardwired to the BCM and the PCM . The ignition switch - push button start is used to obtain the OFF, ON or START ignition modes. For more information, REFER to 211-05

The ignition switch - push button start is part of the GSM and cannot be serviced separately. For more information,
Refer to: External Controls (307-05A Automatic Transmission External Controls - Vehicles With: 6-Speed Automatic Transmission - 6F50, Diagnosis and Testing).
(with 2.0L EcoBoost), or Refer to: External Controls - System Operation and Component Description (307-05B Automatic Transmission External Controls - Vehicles With: 6-Speed Automatic Transmission - 6F35, Description and Operation).
(with 3.7L Duratec)

Passive Key

Refer to: Perimeter Anti-Theft Alarm - System Operation and Component Description (419-01A Perimeter Anti-Theft Alarm, Description and Operation).

Passive Anti-Theft Transceiver

Refer to: Perimeter Anti-Theft Alarm (419-01A Perimeter Anti-Theft Alarm, Diagnosis and Testing).

Body Control Module (BCM)

Refer to: Module Controlled Functions - System Operation and Component Description (419-10 Multifunction Electronic Modules, Description and Operation).

Powertrain Control Module (PCM)

The Powertrain Control Module (PCM) receives input signals from sensors and other components (switches, relays). Based on this information, the Powertrain Control Module (PCM) generates output signals to control various relays, solenoids and actuators. The PCM provides power and ground to the starter relay to initiate cranking of the engine. For more information,
Refer to: Electronic Engine Controls (303-14A Electronic Engine Controls - 3.7L Duratec (227kW/301PS), Diagnosis and Testing).

Tire Pressure Monitor (TPM) Module

The Tire Pressure Monitor (TPM) module is a receiving antenna that receives high frequency signals. When a remote start request is initiated from the passive key the Tire Pressure Monitor (TPM) module receives the signal and communicates the remote start request message to the BCM . The BCM transmits the message via the Medium Speed Controller Area Network (MS-CAN) to the BCM to initiate a remote start event. For more information,
Refer to: Tire Pressure Monitoring System (TPMS) - System Operation and Component Description (204-04A Tire Pressure Monitoring System (TPMS), Description and Operation).

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