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Home >> Cadillac >> 2007 >> CTS Base, 2.8 T, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 763 (Keyless Entry System And Remote Functions) >> Diagnostic Information and Procedures >> DTC B3124 >> Circuit/System Description
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Circuit/System Description

WARNING: This page is about a different car, the 2013 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

The headliner antenna is located in the headliner near the rear of the vehicle and is used to establish low frequency (LF) communications with the keyless entry transmitter. The headliner antenna is used to determine transmitter placement within the vehicle. When a valid keyless entry transmitter is within the passenger compartment, the console and headliner antenna broadcast a challenge within the passenger compartment to the transmitter. If the response from the transmitter via radio frequency (RF) is a valid response, the antenna will determine there is a fob within the vehicle. If no response is received, the antenna determines that no fob is in the vehicle.

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