Remote Vehicle Start Circuit Description/Active

WARNING: This page is about a different car, the 2021 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.

The BCM receives a signal from the keyless entry transmitter indicating a remote vehicle start request. The BCM uses the following inputs to verify the system is ready for a 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 a remote vehicle start event, a message is sent via serial data to the ECM. The ECM relies on the remote vehicle start message from the 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