Remote Start System: Operation: Notes

Remote Start Operation:

• The RFH detects that the remote start button has been pressed twice within five 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 RFH then broadcasts several messages over the a Controller Area Network-Chassis (CAN-C) bus to the 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 ESL's operative state.
• 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 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 acknowledgement 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 PDC allowing the starter to crank.
  NOTE:

  If the minikrypt verification was not successful, the PCM shuts down the engine after two seconds.