Remote Vehicle Start Circuit Description/Active
The Keyless Entry Control Module receives a signal from the keyless entry transmitter indicating a remote vehicle start request. A message is then sent to the BCM which determines if a crank request message will be sent to the ECM to activate remote vehicle start. The BCM looks at the following inputs to verify the system is ready for an remote vehicle start event:
- Vehicle is not in valet mode
- All vehicle doors are closed
- Rear compartment lid is not ajar
- The hood is closed
- The doors are locked
- The hazard switch is OFF
- Battery reconnect has not occurred
- Vehicle power mode is correct.
When the BCM determines all conditions meet those required for an remote vehicle start event, a message is sent via serial data to the BCM. The ECM relies on the remote vehicle start message from BCM, to enable remote vehicle start when the crank request signal is received. If the ECM does not receive a valid remote vehicle start message, it will not ground the control circuit of the crank relay and start the engine. While the ECM is in remote vehicle start mode it will cut fuel to the engine if any of the following additional conditions occur:
- Vehicle speed is greater than 0.
- Transmission is not in P.
- Excessive engine coolant temperature
- Low oil pressure
- The malfunction indicator lamp (MIL) is commanded ON.
- Engine crank time is greater than 30 seconds.
- Excessive engine speed.
- Accelerator pedal position too high.
- Remote start timer equals 0.
- Immobilizer system indicates a theft attempt