Start / Stop Switch: Description and Operation: Overview

Push-Button Start - with Intelligent Access (IA)

Overview

The push-button ignition system uses the following components to achieve the 4 ignition modes (OFF, ACC, RUN and START):
- BCM (Body Control Module)
- BPP (Brake Pedal Position)
- IA (Intelligent Access) key
- RFA (Remote Function Actuator) module
- Start/stop switch
- TPM (Tire Pressure Monitor) module

To achieve any ignition mode other than OFF, the IA (Intelligent Access) key must be present inside the vehicle. The driver need not perform any actions on or with the IA (Intelligent Access) key to operate the push-button ignition system. It is sufficient that the IA (Intelligent Access) key is located inside the vehicle when the start/stop switch is pressed. Pressing the start/stop switch causes the RFA (Remote Function Actuator) module to send out a RF (Radio Frequency) signal to the IA (Intelligent Access) key. The IA (Intelligent Access) key responds by transmitting a RF (Radio Frequency) signal to the TPM (Tire Pressure Monitor) module. The TPM (Tire Pressure Monitor) module then sends a message over a dedicated network to the RFA (Remote Function Actuator) module that the IA (Intelligent Access) key has responded. The RFA (Remote Function Actuator) module then sends a message over the MS-CAN (Medium Speed Controller Area Network) to the BCM (Body Control Module) indicating the correct IA (Intelligent Access) key is present. The BCM (Body Control Module) then takes the appropriate action based on the start/stop switch and BPP (Brake Pedal Position) switch inputs.

Backup Transceiver

If the battery inside the IA (Intelligent Access) key is weak, damaged or if excessive ambient RFI (Radio Frequency Interference) prevents communication between the RFA (Remote Function Actuator) module and the IA (Intelligent Access) key, the backup transceiver located in the center console storage compartment provides a secondary means for the RFA (Remote Function Actuator) module to validate the IA (Intelligent Access) key and authorize use of the vehicle. The backup transceiver uses passive RF (Radio Frequency) identification to exchange signals with the IA (Intelligent Access) key, similar to the way a encoded PATS (Passive Anti-Theft System) key and transceiver operate. For information on the IA (Intelligent Access) key and backup transceiver, REFER to Backup Transceiver .

Push-Button Ignition System Message Center Messages

The message center provides instruction for operating the push-button ignition system. The message center also displays warnings that indicate a potential concern with the system. These messages pertain to the push-button ignition system:
- PRESS BRAKE TO START - Momentarily displays when the start/stop switch is pressed without the brake pedal being applied.
- ACCESSORY POWER ACTIVE - Displays when the vehicle is in ACC mode.
- SHIFT TO PARK - Displays when the start/stop switch is pressed to shut off the engine with the gear selector lever not in PARK.
- RESTART NOW OR KEY IS NEEDED - Displays when the start/stop switch is pressed to shut the engine off and the IA (Intelligent Access) key is not detected in the vehicle.
- NO KEY DETECTED - Displays if the IA (Intelligent Access) key is not detected by the RFA (Remote Function Actuator) module while attempting to start the vehicle, enter ACC or RUN mode. If this message is observed with the IA (Intelligent Access) key located inside the vehicle, REFER to No Key Detected Message .
- STARTING SYSTEM FAULT - Displays if the RFA (Remote Function Actuator) module receives invalid data from the PCM (Powertrain Control Module) during PATS (Passive Anti-Theft System) authentication. If this message is observed, REFER to Symptom Chart: Passive Anti-Theft System (PATS) Passive Anti-Theft System (PATS) - with Intelligent Access (IA).