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.

The console active antenna is located in the center console and is used to establish low frequency (LF) communications with the keyless entry transmitter The keyless entry console active antenna is only used when the console passive antenna was unable to locate a transmitter within the interior of the vehicle. This may be due to a keyless entry transmitter battery being low or RF/LF interference.

When a valid transmitter is placed into the pocket located in the center console, and either the brake pedal is depressed or the ignition control knob is pressed, the console active antenna broadcasts a challenge to the transmitter. This causes a low frequency coupling to occur between the transmitter and the console active antenna. If the response from the transmitter is a valid response, and all of the security requirements are met, the vehicle's engine will start, or be allowed to go into accessory mode.