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 3 ignition modes (OFF, ON and START):
- Start/stop switch
- BCM (Body Control Module)
- BPP (Brake Pedal Position) switch
- CPP (Clutch Pedal Position) switch
- IA (Intelligent Access) key
- RFA (Remote Function Actuator) module

In ON and START, the BCM (Body Control Module) distributes this voltage to other modules and vehicle systems through the accessory relay (inhibited during START) and the ignition relay. The BCM (Body Control Module) broadcasts an ignition mode network message over the CAN (Controller Area Network).

It is not necessary for the driver to perform any actions with the IA (Intelligent Access) key to operate the push button ignition system. To achieve any ignition mode other than OFF, the IA (Intelligent Access) key must be present inside the vehicle. It is sufficient that the IA (Intelligent Access) key is located inside the vehicle when the start/stop switch is pressed.

When the start/stop switch is pressed, the BCM (Body Control Module) needs to determine that a IA (Intelligent Access) key is present in the vehicle. REFER to Passive Anti-Theft System (PATS) .

When it is determined that a valid IA (Intelligent Access) key is in the vehicle, the BCM (Body Control Module) and PCM (Powertrain Control Module) takes the appropriate action based on the start/stop switch and BPP (Brake Pedal Position) switch (automatic transmission) or CPP (Clutch Pedal Position) switch (manual transmission) input.

Backup Transceiver

If the IA (Intelligent Access) key battery is weak or damaged, or if excessive ambient RFI (Radio Frequency Interference) prevents communication between the RFR (Remote Functions Receiver) module and the IA (Intelligent Access) key, the backup antenna, located on the RH (Right Hand) side of the steering column (where a conventional ignition lock cylinder would be located), 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 RFR (Remote Functions Receiver) module uses passive RF (Radio Frequency) identification to exchange signals with the IA (Intelligent Access) key.

Push-Button Ignition System Message Center Messages

The message center provides instructions 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 (automatic transmission) - Momentarily displays when the start/stop switch is pressed without the brake pedal being applied.
- Press clutch to start (manual transmission) - Momentarily displays when the start/stop switch is pressed without the clutch pedal being applied.
- 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, or enter ON mode. If this message is observed with the IA (Intelligent Access) key located inside the vehicle, REFER to No Key Detected Message .