Remote Starting System: Notes

OPERATION

The optional Remote Start system operates from as far as 100m (328ft) to not only start the vehicle via key fob activation, but also activates the climate control and (if equipped) the optional heated and ventilated seats and optional heated steering wheel depending on temperatures outside and inside the vehicle.

All of the following conditions must be met before the engine will remote start:

The Radio Frequency Hub (RFH) detects that the remote start button has been pressed twice within 5 seconds. Note that if the remote start button is pressed again, this will terminate the remote start event.
The RFH authenticates the key fob.
The RF-Hub then broadcasts several messages over the a Controller Area Network-Chassis (CAN-C) bus to the Body Control Module (BCM) indicating the physical position of the key fob, if the ignition is in run or start mode and if the vehicle is equipped with an Electronic Steering Lock (ESL) and the operative state of the ESL.
The BCM then receives the "Starter Enable" request over the CAN-C bus from the RFH.
The BCM challenges and reads the states of the remote start inhibitors.
If there are no active inhibitors, the BCM broadcasts the ignition commands request over the CAN-C bus, CAN-Interior High Speed (IHS) bus, and the Local Interface Network (LIN) bus networks. Any module or component that needs to use ignition inputs uses ignition outputs controlled by the BCM.
The Powertrain Control Module (PCM) receives the "Starter Enable" request over the CAN-C bus.
The PCM initiates a minikrypt code exchange with the BCM. The BCM responds to this challenge with a verification acknowledgment to the PCM.
If the minikrypt code exchange was successful, the PCM applies a Low Side Driver (LSD) as needed to energize the starter relay.
Starter Relay is actuated. This relay is powered by a dedicated fuse in the Power Distribution Center (PDC) allowing the starter to crank.
NOTE:
If the minikrypt verification was not successful, the PCM shuts down the engine after 2 seconds.

The Remote Start Antenna (RSA) is used to provide a greater range for remote start operation and is connected to, and monitored by the RFH. The RFH will perform self- diagnostics on the attached remote start antenna to determine if it is connected to the RFH and drawing current.

INHIBITORS

Engine Coolant Temperature (ECT) sensor - Used to verify that the engine coolant temperature is within an acceptable range for engine operation.

Ajar switches - Used to indicate if any vehicle access points on the vehicle or opened or closed. Outputs to the BCM. Challenged by the RFH.

ESL - An added layer of security that locks the column.

Fuel level sensor and Fuel Pump Control Module (FPCM) - Signaled by the PCM to drive the fuel pump to support engine starting if a sufficient amount of fuel is detected.

Hazard switch - The hazard switch needs to be in the OFF position.

Ignition state - The ignition needs to be in the OFF state.

Intelligent Battery Sensor (IBS):

The IBS interacts with the BCM by means of the LIN bus communications. The BCM is its master node.
The IBS is used to give information about raw battery current, voltage, and temperature levels. The battery needs to be at an acceptable charge level.

Low Frequency (LF) antennas - Used in validation of the key fob being preset during start request.

Oil Pressure sensor - Used to determine that the engine has an acceptable oil pressure range prior to starting the engine.

Transmission Range Sensor (TRS) - Used to indicate the position of the gear shift lever.

Vehicle Speed Sensor (VSS) - Used to verify the vehicle is not moving.

Vehicle Theft Alarm (VTA) or Intrusion Detection System (IDS) - Signal sent indicating the status of the VTA or the IDS system. An active VTA or IDS state will disable the remote start function.