Circuit/System Description
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
When a transmitter authentication is requested, the console passive antenna broadcasts a challenge within the passenger compartment to the transmitter. If the response from the transmitter via radio frequency (RF) is a valid response, the RCDLR determines there is a transmitter within the vehicle. If no response is received, the RCDLR determines that no transmitter is in the vehicle, and NO FOB DETECTED will be displayed on the DIC.
Transmitter authentication occurs during any of the following situation:
- When the vehicle is off and the start button is pressed.
- When the vehicle is off and the brake pedal is pressed (vehicle must be awake)
- When the vehicle is running and any door is opened and then closed.