Circuit Description (RVS)

The body control module (BCM) is the main controller for remote vehicle start (RVS). It handles the majority of the RVS functions from how long RVS last to protecting the vehicle from theft while RVS is active.

Once the BCM receives a signal from the key fob, it reviews the following information to determine if a Crank Request message will be sent to the ECM/PCM to activate RVS:

• Valid hood ajar switch closed signal.
• The key is not in the ignition.
• The doors are locked.
• The hazard switch is OFF.

The ECM/PCM relies on the RVS message from the BCM to enable RVS when the Crank Request signal is received. If the ECM/PCM does not receive a valid RVS message from the BCM it will not ground the control circuit of the CRANK Relay and start the engine. While the ECM/PCM is in RVS mode it will cut fuel to the engine if any of the following additional conditions occur:

• Vehicle speed is greater than 0 km/h.
• Engine overheating.
• Low oil pressure.
• The malfunction indicator lamp (MIL) is commanded ON.
• Engine crank time is greater than 30 seconds.
• Engine speed greater than 2,000 RPM for more than 10 seconds.
• Engine speed greater than 4,000 RPM for more than 2 seconds.
• The throttle position (TP) is greater than 10 percent for 2 seconds.
• The remote start timer equals 0.